SU693364A1 - Device for interfacing with main - Google Patents

Description

(54) DEVICE OF CONTRACT WITH THE HIGHWAY

The delivered circuit is achieved by introducing a direct access request switch, a control signaling signal encoder and a format descriptor in the black, the inputs of which are connected to the second outputs of the word count register k. the current address register, and the output with the third control input of the data register, with the second control input of the word count register, with the fourth control input of the current address register, with the second output of the device and with WMMyraTo s direct access and signal width extension control, the second inputs of the ToJibre are connected to the second code of the state register, the third input of the direct access request switch is connected to the third output of the word count register and the second control input of the state register, the fourth input is connected to the second input units, and the output with the third input of the interrupt control unit, the third input of the entrainment signal encoder. is connected to the second output of the control unit, rerayeyem, and the output with the input of the transmission unit.

Such a solution allows organizing data exchange with variable length in direct access mode, which improves the solution of software emulation issues and increases the throughput of the trunk when working with a multiple of the main one.

The drawing shows a block diagram of the interface with the highway. The device includes an interrupt control unit 1, a deactivation unit 2 - register addresses, (data speed 3, a status register 4, a word count register 5, a current address register 6, a direct access request switch 7, a control signal encoder 8, a decoder 9 format features , transmission unit 10, reception unit 11.

On one side, the device is connected to the local control unit 12, which controls the external device 13 and, on the other hand, via inputs 14 and outputs 15 to magistryli 16., & cphi i 17 and outputs 18 for transmitting control signals between the interface device and the local control device 12. Inputs 19 are used for inputting data to the device with & Outputs 20 serve to output data to a local control device.

693364

With the help of this invention, it is possible to transform the formats of transmitted information arrays, while unloading the processor, trunk

and greatly simplifies emulation programming. The size of the word transmitted to line 16 depends on the size of the word RAM, with which the exchange is made. . .. chg. ;;;

So, with a 36-word word, the proposed device can provide data exchange with the following forks (depending on emulation requirements):

I. 32 information and 4 control bits;

I. 16 information and 2 control bits; .

W. 36 informational bits.

° When transmitting data in the I and / ffi format, the information is transmitted to the trunk via 36 lines accompanied by signals on the control lines corresponding to the word sign. The transfer of format / d is carried out in the presence of a special feature in register 4. In this case, the check bits are used as information.

The transfer format C is used in the case of emulation of work with 18-bit RAM. In this mode, two calls to the RAM, and consequently, two cycles to the line, are required to transfer one word. If in the exchange process to replace the format | format I, the transfer time to the trunk and the RAM occupancy time for writing or reading the same data array is reduced by almost

by 50%.

In this case, the main array is transmitted by format I, and a half-word, if there is an array in the | Chale or in the crest, is transmitted by format 5. The transition from one format 5 to another is provided by blocks 7, 8, 9.

The invention provides for the transfer of information from the RAM through MiarticTpanb 0 to an external device - recording, as well. Same From the bootable device through the trunk to the O memory - reading. 1, Record.

For direct access organizations in the 5 registers of the device must be transmitted information on the number of transmitted words, the starting address of the exchange of RAM and control information. This information is loaded into the corresponding registers by the processor through the mainstation 16. At the same time, from the trunk 16 to the device through the tl block, accompanied by the synchronization signal, the addresses of registers, the data, the 3iariHCb / 4Tek sign. If the received address belongs to the data registers of the device, then a specific register is determined, and the write / read is written or read by a write / read sign. Address decoding, and the writing or reading of the register is performed with block 2. The number of half words in the additional code is entered into register 5. In register 6, the starting address of the RAM is entered with a half-word.

If the exchange is supposed to be in the I or O format, then the 1st filling of registers 5 and 6, block 9 will sign the word / half word. After that, a command (in this case, a record) is entered into register 4, as a result of which block 7 issues a request for direct access.

The occurrence of errors in the exchange process in the interface device or on the external device is fixed in register 4, which leads to the interruption of the main processor program.

Upon completion of the transmission of the data array, register 5 generates a signal causing an interrupt, according to which the processor determines that the device has completed the exchange and is ready to transmit the new array.

2. Reading.

In this mode, the operation of the interface device differs little from that described above.

The difference is as follows.

After loading the initial information, the first request of direct access is issued after writing to the register 3 words or half-words of information from an external device. Data transfer to the trunk is accompanied by a code entry in the RAM on the control lines.

For organizing the exchange of 1P format in registTra 4, a special feature of this format is established. According to this feature, in register 3 and blocks 8, 12, switchings are provided, which are used by the control bits as informational. The rest of the work is similar to the exchange format 1.

Thus, the application of the proposed device interface external

A cable with a trunk allows data exchange with the same performance as when working in the exchange mode with the same formats of transmitted data, i.e. Loss of performance in emulation mode is eliminated and the use of a device for exchanging data with a variable format becomes possible.

Claims (2)

Invention Formula X. An interface with a trunk containing a control unit (U), the first input of which is connected to the first output of the Tfiem block, and the output to the input of the output unit, the data register, the status register, the word count register, the current address register, the first information inputs connected to the second output of the receiving unit, the first outputs - from axtjha- m.a output unit, and the first control inputs with the output of the address decoding unit, whose input is connected to the second output of the receiving unit, the second information inputs of the data register and state registers are the first and second inputs of the device, respectively, and their second outputs are the first and second outputs of the device, respectively, the third output of the status register is connected to the second input of the interrupt control unit, the second output of which is connected to the second | 1 control inputs of the regas data and the current address register, and the third output is with the third control inputs with the inputs of the register of the spam account in the register of the current address, which means that, in order to extend the functionality of account providing data exchange with various formats, a jTaiop request of direct access is entered into the device, a swffr / torus of control signals 8 a descrambler with; format characters, the inputs of an igorog dinene with the second outputs of the word count register and the current address register, and the output with the third control register register data, with the second control input of the account register words, with the fourth control of the current address register, with the second output of the device and with the first inputs of the direct access request switch In the control coder t, v. © control, the second inputs of which are registered with the second output of the registration status, the third input of the access switch AETKrybv r ptc) is connected to the third output of the word count register and the second control input of the status register, the fourth input to the second M input of the device, and the output to the third input of the interrupt control unit, the third input of the encoder signal. .te ±, -: iкifff, .. -3 ",. gir. - "but.; and -: em gt (E1a aUId5 1.h 4 /.: - .. / - / i1 | k) | -n | ravpeni is connected with the second bypass of the interrupt control unit, and the output is with the input of the transmission unit. Sources of Information, 5 taken into account in the examination 1. The author's certificate of the USSR No. 525079, cl. G 06 F 3/04, 1975. 2. US patent number 3815099, 10 CP. USA 340-172.5, 1975 (prototype).