CN1362675A

CN1362675A - Circuit system and transmission method enabling mutual transmission of LPC devices

Info

Publication number: CN1362675A
Application number: CN 02102873
Authority: CN
Inventors: 陈林鸿
Original assignee: Via Technologies Inc
Current assignee: Via Technologies Inc
Priority date: 2002-01-28
Filing date: 2002-01-28
Publication date: 2002-08-07
Anticipated expiration: 2022-01-28
Also published as: CN100452004C

Abstract

The invention relates to an LPC device, in particular to a circuit system and a transmission method for mutual transmission among LPC devices, which mainly comprise a first LPC bus bar connected with a first LPC device, a second LPC bus bar connected with a second LPC device, and an LPC control device, wherein the first LPC device can be controlled and driven by the first LPC bus bar, the second LPC device can be controlled and driven by the second LPC bus bar, a period of transmission of the first LPC device to the second LPC device can be started by the LPC control device through the first LPC bus bar, a plurality of waiting states are inserted after a transmission request is sent out by the first LPC device, and then the period of transmission of the second LPC device is started by the LPC control device through the second LPC bus bar according to the transmission request of the first LPC device, so that the mutual transmission among the LPC devices can be realized.

Description

Circuits System and transmission method that the LPC device is transmitted mutually

Technical field

The present invention relates to a kind of LPC device, particularly a kind of Circuits System and transmission method that transmits mutually between the LPC device that make.

Background technology

In recent years, because the high development of information related industry and people increase day by day to the requirement of information product computing and transmission speed, make ISA (Industry StandardArchitecture-industry standard design) interface that the dealer commonly used in the past apply use.Because the ISA interface can only be worked under the frequency of 8MHz, transmission speed is too slow, and the pin position of its required use too many (60 pin position), not only takes up space but also make the cost of slot high, does not meet in fact in modern IT industry and pursues fast and compact trend.Therefore constantly study under the improvement the dealer, develop a new interface specification, be i.e. LPC interface (Low Pin Count Interface-few pin calculates interface).Because the LPC interface can work under the frequency of 33MHz, the efficient of transmission is promoted greatly, and it need the interface standard that uses 10 pin positions following, not only reduced the cost of IC and slot, also in the compact trend of pursuit, be subjected to the vast welcome of industry.

Commonly use Circuits System that the LPC device connects as shown in Figure 1, it consists predominantly of: a LPC control device 12 and a main LPC device 14, need fashion can set up subordinate LPC device 16 based on system, and main LPC device 14 and subordinate LPC device 16 are connected respectively with LPC control device 12 with a LPC bus-bar 18.

Because specification (specification) lining at the LPC interface, every document transmission of each LPC device must be sent by LPC control device end, and finish at LPC control device end, so under above-mentioned custom circuit system, the transmission of its data can only be carried out at LPC control device 12 and main LPC device 14, or carry out at LPC control device 12 and subordinate LPC device 16, shown in Fig. 2 A and Fig. 2 B.Wherein Fig. 2 A is the sequential chart of main LPC device read cycle, at first begin a read cycle by the LPC control device, when LFRAME# begins first cycle, the signal (START) that (LAD[3: 0]) sent out by LPC control device (H) earlier in the shared pin position of address and data, afterwards movement device being switched (TAR) is main LPC device (M), the kenel in main LPC device elder generation's declaration cycle and direction (CYCTYPE+DIR) are for reading data, be the address (ADDR) and the size (SIZE) thereof of data afterwards, and then movement device is switched (TAR) is the LPC control device, the LPC control device then sends one earlier and confirms signal (SYNC), responds the request of reading of main LPC device again and gives to finish this cycle (TAR) after the data.

Fig. 2 B then is the sequential chart of subordinate LPC device read cycle, also need cycle of beginning to read by the LPC control device, send the signal of beginning by the LPC control device, and the declaration kenel in cycle and direction are after reading the address of the data of subordinate LPC device and data, movement device is switched to subordinate LPC device (S), subordinate LPC device then sends one earlier and confirms signal, and finishes this one-period after responding its data of asking to read of LPC control device.

From the above, in same LPC bus-bar, main LPC device 14 and 16 in subordinate LPC device are the transmission that can't make data.Device in same system can't be done the transmission of mutual data, that is its data can't use alternately, and real be that one of resource is wasted greatly.

Therefore, how at the above-mentioned shortcoming of commonly using the LPC Circuits System, and the problem that is taken place when using proposes a kind of novel solution, design a kind of simple and effective circuit System and method for, not only make between each LPC device and can pass data mutually, and can reduce the required program of transmission, improve the efficient of transmission, not be to use the person eagerly to look forward to for a long time always and difficulty place that human desires row of the present invention solves.And the inventor is based on the correlative study of engaging in IT industry for many years, exploitation, and the practical experience of selling, it is the idea of thinking and improveing, after designing, inquire into, study sample and improvement in many ways, finally work out the Circuits System and the transmission method that transmit mutually between a kind of LPC of making device, to solve the above problems.

Summary of the invention

Technical matters to be solved by this invention is, at the above-mentioned deficiency of prior art, and the Circuits System and the transmission method that provide a kind of LPC of making device to transmit mutually.

Above-mentioned technical matters of the present invention is realized by following technical scheme.

A kind of Circuits System of transmitting mutually between the LPC device that makes is characterized in that including:

One LPC bus-bar;

One main LPC device is connected in this LPC bus-bar;

At least one subordinate LPC device is connected in this LPC bus-bar; And

One LPC control device can and drive main LPC device and subordinate LPC device by this LPC bus-bar control;

Wherein, this LPC control device respectively includes an address working storage with this main LPC device.

Except that above-mentioned essential features, in specific implementation process, also can replenish following technology contents:

This subordinate LPC device respectively includes an address working storage.

The present invention also provides a kind of transmission method that utilizes the Circuits System of transmitting mutually between the above-mentioned LPC of making device, it is characterized in that mainly comprising the following step:

Begin the cycle of a pair of main LPC device transmission by the LPC bus-bar by the LPC control device;

Main LPC device sends the request message of a pair of subordinate LPC device transmission to the LPC control device via the LPC bus-bar; And

The LPC control device begins the cycle of a pair of this subordinate LPC device transmission according to the request of main LPC device, and the transmission requests message is sent to this subordinate LPC device through the LPC bus-bar.

This transmission method, except that above-mentioned essential features, in specific implementation process, also can replenish following technology contents:

Wherein this transmission requests is the request of reading data.

Still include the following step:

Main LPC device is recorded in its address working storage with its address that will read data, uses the data that identification is read; And

The LPC control device is responded any data value earlier after the data that the reads request that receives main LPC device.

Still include the following step:

The LPC control device is recorded in its address working storage with its address that will read data after receiving the data that the reads request of main LPC device, uses the data that identification is read.

Still include the following step:

Subordinate LPC device is responded the request of reading of LPC control device, with its data transmission of desiring to read to the LPC control device;

The data that main LPC device transmits by LPC bus-bar monitoring subordinate LPC device, and identification and obtain the data that it desires to read by the address of its address working storage record.

Wherein this transmission requests is one to write the request of data.

Technical matters of the present invention also can be realized by following another technical scheme.

One the one LPC bus-bar can be connected with at least one LPC device;

One the 2nd LPC bus-bar can be connected with at least one LPC device; And

One LPC control device, including an address working storage can control and drive a LPC device by a LPC bus-bar, and

Control and drive the 2nd LPC device by the 2nd LPC bus-bar.

The present invention also provides the transmission method of above-mentioned another Circuits System, it is characterized in that, step includes;

Begin the cycle that a wherein LPC device that is connected in a LPC bus-bar transmits a wherein LPC device that is connected in the 2nd LPC bus-bar by the LPC control device by a LPC bus-bar, and after this LPC device that is connected in a LPC bus-bar sends transmission requests, insert a plurality of waiting statuss;

Begin a pair of this according to this transmission requests by the 2nd LPC bus-bar by the LPC control device and be connected in the cycle of the LPC device transmission of the 2nd LPC bus-bar;

If this transmission requests is the request of reading, then behind the end cycle of the 2nd LPC bus-bar, the cycle that stops at a LPC bus-bar is inserted waiting status, and by the LPC control device data that reads is responded to this and to be connected in the cycle that finishes a LPC bus-bar behind the LPC device of a LPC bus-bar; And

If this transmission requests is one to write request, then behind the end cycle of the 2nd LPC bus-bar, the cycle that stops at a LPC bus-bar inserts to wait and holds state, and finishes the cycle of a LPC bus-bar.

The invention has the advantages that:

1, is to utilize the LPC control device to connect each LPC device respectively, and can under the LPC interface specification, makes mutual data transmission between the LPC device by two LPC bus-bars.

2, be provided with an address working storage in the LPC control device, correct data and the transmission direction thereof of identification in order to the address of record tendency to develop transmitting data.

3, in single LPC bus-bar, respectively set up an address working storage in LPC device and LPC control device, correct data and the transmission direction thereof of identification in order to the address of record tendency to develop transmitting data.

4, the data that only need use two cycles can reach between the LPC device is transmitted fast.

Now for feature of the present invention, structure and the effect reached are had further understanding and understanding, careful assistant with the detailed explanation of preferred embodiment and conjunction with figs. as the back:

Description of drawings

Fig. 1 commonly uses the block schematic diagram that the LPC device connects.

Fig. 2 A and Fig. 2 B are the sequential charts that is respectively the write cycle of the read cycle of commonly using main LPC device and subordinate LPC device.

Fig. 3 is the block schematic diagram of a preferred embodiment of the present invention.

Fig. 4 is the sequential chart that main LPC device embodiment illustrated in fig. 3 reads subordinate LPC device data.

Fig. 5 is that the main LPC device of embodiment writes data the sequential chart of subordinate LPC device as shown in Figure 3.

Fig. 6 is the block schematic diagram of another embodiment of the present invention.

Fig. 7 is that the main LPC device of embodiment reads the sequential chart of subordinate LPC device data as shown in Figure 6.And

Fig. 8 is that the main LPC device of embodiment writes data the sequential chart of subordinate LPC device as shown in Figure 6.

Embodiment

At first, seeing also Fig. 3, is the block schematic diagram of a preferred embodiment of the present invention.As shown in the figure, it is mainly constructed and includes: a LPC control device 22, one a main LPC device 24 and a subordinate LPC device 26, other is provided with one the one LPC bus-bar 28 and uses connection LPC control device 22 and main LPC device 24, and one the 2nd LPC bus-bar 29 is in order to connect LPC control device 22 and subordinate LPC device 26, wherein, this LPC control device 22 still is provided with an address working storage 225.

Because in the interface specification of LPC, each read/write cycle all must finish by 22 beginnings of LPC control device and in LPC control device 22, cause the awkward situation that to transmit mutually between the LPC device, so we can be provided with a plurality of LPC bus-bars, the LPC device is connected to different LPC bus-bars, so, can finish data transmission mutual between the LPC device under the standard of its interface specification, its transmission method is then as following.

See also Fig. 4, be that the main LPC device of embodiment reads the sequential chart of subordinate LPC device data as shown in Figure 3, it mainly need use two cycles, at first begin first cycle by LFRAME1 pin position at a LPC bus-bar by LPC control device (H), and in the shared pin position of address and data (LAD1[3: 0]) send the signal (START) of beginning by the LPC control device earlier, afterwards movement device being switched (TAR) is main LPC device (M), the kenel in main LPC device elder generation's declaration cycle and direction (CYCTYPE+DIR) are for reading the data of subordinate LPC device, be address (ADDR) and the size (SIZE) thereof of desiring the data that reads afterwards, and then movement device is switched (TAR) is the LPC control device, the LPC control device then sends one earlier and confirms signal (SYNC), and confirms to insert in the signal a plurality of waiting statuss (wait state) at this.

At this moment, the LPC control device begins second period by LFRAME2 pin position at the 2nd LPC bus-bar according to the request of reading of main LPC device again, and in the shared pin position of address and data (LAD2[3: 0]) send the signal (START) of beginning by the LPC control device earlier, the kenel in declaration cycle and direction (CYCTYPE+DIR) are for reading the data of subordinate LPC device, be address (ADDR) and the size (SIZE) thereof of desiring the data that reads afterwards, this address all is sent to the identical of LPC control device with main LPC device with size, and then movement device is switched (TAR) is subordinate LPC device (S), subordinate LPC device then sends one earlier and confirms signal (SYNC), and the data (DATA) that the LPC control device is desired to read responds and gives the LPC control device, then finishes the cycle (TAR) of the 2nd LPC bus-bar afterwards.

The LPC control device then stopped in first bus-bar and inserted waiting status this moment, owing to record the address that main LPC device is asked the data that reads in the address working storage of LPC control device, give main LPC device so can will be in second bus-bar respond, and finish the cycle (TAR) of first bus-bar and finish the action that main LPC device reads subordinate LPC device by the data (DATA) that reads in the subordinate LPC device.

Again, seeing also ginseng Fig. 5, is that the main LPC device of embodiment writes data the sequential chart of subordinate LPC device as shown in Figure 3.At first begin first cycle by LFRAME1 pin position at a LPC bus-bar by the LPC control device, and LAD1[3: 0] send the signal (START) of beginning by the LPC control device earlier, afterwards movement device being switched (TAR) is main LPC device, the kenel in main LPC device elder generation's declaration cycle and direction (CYCTYPE+DIR) are for to write subordinate LPC device with data, the address of desiring to write for data (ADDR) afterwards, size (SIZE) and data (DATA) itself, and then movement device is switched (TAR) is the LPC control device, the LPC control device then sends one earlier and confirms signal (SYNC), and confirms to insert in the signal a plurality of waiting statuss (waitState) at this.

At this moment, the LPC control device begins second period by LFRAME2 pin position at the 2nd LPC bus-bar according to the request that writes of main LPC device again, and LAD2[3: 0] send the signal (START) of beginning by the LPC control device earlier, the kenel in declaration cycle and direction (CYCTYPE+DIR) are for to write subordinate LPC device with data, address of desiring to write for data (ADDR) and data (DATA) afterwards, be sent to the identical of LPC control device at this its address with main LPC device, and then movement device is switched (TAR) is subordinate LPC device (S), subordinate LPC device then sends one earlier and confirms signal (SYNC), finishes the cycle (TAR) that write activity then finishes the 2nd LPC bus-bar afterwards.

The LPC control device then stopped in first bus-bar and inserted waiting status this moment, and finished the cycle (TAR) of first bus-bar and finish the action that main LPC device writes data in subordinate LPC device.

Utilize the framework of a plurality of LPC bus-bars from the above, can under the standard of LPC interface specification, reach the purpose that the information between the LPC device is transmitted mutually.

Secondly, seeing also Fig. 6, is the block schematic diagram of another embodiment of the present invention.As shown in the figure, it is mainly constructed is to include: a LPC control device 32, one main LPC device 34, at least one subordinate LPC device, as the first subordinate LPC device 36, the second subordinate LPC device 37 and a LPC bus-bar 38, wherein this LPC control device 32 respectively is provided with an address working storage 325,345 with main LPC device 34, and the LPC control device then connects main LPC device 34 and each subordinate LPC device by the LPC bus-bar.

Ask in the present embodiment, because all LPC devices all are connected in a LPC bus-bar, for the direction of transfer of each document of identification,, be unlikely the confusion that causes system so that can transmit mutually between each LPC device so need in LPC control device and LPC device, to set up the address working storage.Its transmission method is then as described in following.

Seeing also Fig. 7 and Fig. 8, is to be respectively main LPC device embodiment illustrated in fig. 6 write and read data to the first subordinate LPC device sequential chart.As shown in Figure 7, when if main LPC device is desired to read the data of the first subordinate LPC device, at first send message by LPRAME# pin position and begin first cycle by the LPC control device, at LAD[3: 0] the pin position sends the signal (START) of beginning by LPC control device (H) earlier, afterwards movement device being switched (TAR) is main LPC device (M), the kenel in main LPC device elder generation's declaration cycle and direction (CYCTYPE+DIR) are for reading the data of the first subordinate LPC device, be address (ADDR) and the size (SIZE) thereof of desiring the data that reads afterwards, and then movement device is switched (TAR) is the LPC control device, the LPC control device then sends one earlier and confirms signal (SYNC), responds the request of reading of main LPC device again and any data (DATA) that gives finishes first cycle (TAR) afterwards.

Wherein, because the regulation of its interface specification, the request that main LPC device sends the data of reading, the LPC control device promptly must be responded a data, otherwise will make a mistake less than correct response because of waiting, yet the main LPC device of the certain acomia response of LPC control device is asked the data that reads, so respond any data earlier, mainly the LPC device can judge that according to the record of its address working storage this document is not that it is asked.

And then, the cycle that the LPC control device then begins to read subordinate LPC device according to the information of main LPC device request, also send signal and begin second period by LFRAME#, send the signal (START) of beginning again by the LPC control device, and kenel and the direction (CYCTYPE+DIR) in declaration cycle are to read the address (ADDR of the data and the data of the first subordinate LPC device; Send the identical of LPC control device to main LPC) after, movement device is switched to the first subordinate LPC device (S), the first subordinate LPC device (S) then sends one earlier and confirms signal (SYNC), and the data (DATA) that response LPC control device asks to read finishes second period (TAR) afterwards, main LPC device then can be by the data transmission of monitoring LPC bus-bar, and in addition identification and obtain the data that the first subordinate LPC device is transmitted of the record that utilizes its address working storage.

If when main LPC device desire write the first subordinate LPC device with data, then its sequential chart was as shown in Figure 8.Send message by the LPC control device by LFRAME# pin position equally and begin first cycle, LAD[3: 0] the pin position then earlier sends the signal (START) of beginning by LPC control device (H), afterwards movement device being switched (TAR) is main LPC device (M), the kenel in main LPC device elder generation's declaration cycle and direction (CYCTYPE+DIR) are for to write the first subordinate LPC device with data, afterwards for desiring the address (ADDR) of the data that writes, size (SIZE) and data (DATA) itself, and then movement device is switched (TAR) be the LPC control device, and the LPC control device is then responded main LPC one affirmation signal (SYNC) earlier and finished first cycle (TAR) afterwards.

And then, the LPC control device then begins a cycle that writes subordinate LPC device according to the information of main LPC device request, also send signal and begin second period by LFRAME#, also send the signal (START) of beginning by LPC control device H, and kenel and the direction (CYCTYPE+DIR) in declaration cycle are the address (ADDR that desires the data that writes for data is write the first subordinate LPC device afterwards; Send the identical of LPC control device to main LPC) and data (DATA) itself, it is the first subordinate LPC device (S) that the dress that will move afterwards switches (TAR), the first subordinate LPC device (S) is then responded LPC control device one earlier and is confirmed signal (SYNC), and finishes second period (TAR) behind the write activity of finishing data.

So, via above-mentioned technology, the present invention can reach under the LPC interface specification by the address working storage of two simple read/write cycles and LPC control device and each LPC device, makes between the LPC device and can do the purpose that data is transmitted mutually.

In sum, the invention relates to a kind of LPC device when knowing, especially refer to Circuits System and the transmission method that a kind of LPC of making device transmits mutually, it mainly is to utilize the LPC control device to connect each LPC device respectively by two LPC bus-bars, or set up the address working storage in each LPC device that single LPC bus-bar connects, and can under the LPC interface specification, make mutual data transmission between the LPC device.So the present invention one is rich in novelty, progressive, and can utilize effect, should meet the patented claim important document undoubtedly, submit application for a patent for invention in accordance with the law to for industry.

Only the above, it only is a preferred embodiment of the present invention, be not to be used for limiting scope of the invention process, promptly all equalizations of doing according to the described shape of the present patent application claim, structure, feature and spirit change and modify, and all should be included in the claim of the present invention.

Claims

1. A circuit system capable of mutual transmission between LPC devices, characterized in that it includes:

- LPC busbar;

a primary LPC device connected to the LPC bus;

at least one slave LPC device connected to the LPC bus; and

an LPC control device, which can control and drive the main LPC device and the slave LPC device through the LPC bus;

Wherein, the LPC control device and the main LPC device each include an address register.

2. The circuit system for mutual transmission between LPC devices according to claim 1, wherein each of the slave LPC devices includes an address register.

3. A transmission method utilizing the circuit system capable of mutual transmission between LPC devices as claimed in claim 1, characterized in that it mainly comprises the following steps:

Initiation of a pair of primary LPC device transmission cycles by the LPC control device via the LPC bus;

The master LPC device sends a pair of slave LPC device transmission request messages to the LPC control device via the LPC bus; and

The LPC control device starts a transmission cycle of the slave LPC device according to the request of the master LPC device, and transmits a transmission request message to the slave LPC device through the LPC bus.

4. The circuit system transmission method capable of mutual transmission between LPC devices according to claim 3, wherein the transmission request is a request for reading data.

5. The transmission method of the circuit system capable of mutual transmission between LPC devices according to claim 4, characterized in that it also includes the following steps:

The main LPC device records the address of the data to be read in its address register to identify the data to be read; and

After receiving the data read request from the main LPC device, the LPC control device first responds with an arbitrary data value.

6. The transmission method of the circuit system capable of mutual transmission between LPC devices according to claim 5, characterized in that it also includes the following steps:

After receiving the data read request from the main LPC device, the LPC control device records the address of the data to be read in its address register, so as to identify the read data.

7. The transmission method of the circuit system capable of mutual transmission between LPC devices according to claim 6, characterized in that it also includes the following steps:

The slave LPC device responds to the read request of the LPC control device, and transmits the data it wants to read to the LPC control device;

The master LPC device monitors the data transmitted by the slave LPC device through the LPC bus, and identifies and obtains the data it wants to read by the address recorded in its address register.

8. The circuit system transmission method capable of mutual transmission between LPC devices according to claim 3, wherein the transmission request is a request for writing data.

9. A circuit system capable of mutual transmission between LPC devices, characterized in that it includes:

a first LPC bus bar, to which at least one LPC device can be connected;

a second LPC bus to which at least one LPC device can be connected; and

an LPC control device comprising an address register capable of controlling and driving the first LPC device through the first LPC bus, and

The second LPC device is controlled and driven through the second LPC bus.

10. A transmission method using a circuit system capable of transmitting between LPC devices as claimed in claim 9, characterized in that the main steps include;

The LPC control device starts a period of transmission from one of the LPC devices connected to the first LPC bus to one of the LPC devices connected to the second LPC bus through the first LPC bus, and at this time the connection to the first LPC bus Insert multiple waiting states after the LPC device in the row sends the transmission request;

The LPC control device starts a pair of transmission cycles of the LPC devices connected to the second LPC bus through the second LPC bus according to the transmission request;

If the transmission request is a read request, after the cycle of the second LPC bus ends, the cycle insertion wait state of the first LPC bus is stopped, and the LPC control device responds to the data read by the connection at the ending the cycle of the first LPC bus after the LPC device of the first LPC bus; and

If the transmission request is a write request, after the cycle of the second LPC bus ends, the cycle insertion hold state of the first LPC bus is stopped, and the cycle of the first LPC bus is ended.