SU911498A2 - Microprogramme interface - Google Patents

Description

(FIRMWARE MICROGRAMMING DEVICE

The invention relates to computing and can be used to interface external device groups with a computer I / O channel.

According to the main author. St. No. a firmware interface device containing a communication adapter with a channel, a communication adapter with an external device, an address register, a data register, a command register, a control unit, a generator, a micro-command register, a micro-command decoder, a micro-address address generation unit, the first input of the device . connected to the first input of the communication adapter with the channel, the first output of which is connected to the first input of the microcommand address generation unit, the output of which is connected to the first output of the device, the second input of the device is connected to the input of the microcommand register, the output of which is connected to the decoder input

Claims (1)

micro-commands, the second input of the micro-commands address generation unit is connected to the generator output, the first output of the micro-commands decoder is connected to the first input of the control unit, the first output of which is connected to the second input, m. The communication terminal with the channel, the second output of which is connected to the second output of the device, the third input and the output of the device are respectively connected to the third input and output of the communication adapter with the channel, the second output of the microinstruction decoder is connected to the third input of the output unit. address processing, the fourth, fifth, sixth outputs of the communication adapter with the channel are connected respectively to the first inputs of the command register, data register and address register, the second inputs of which are connected respectively to the second, third and fourth outputs of the control unit, the first outputs of the address registers commands and data are connected respectively to the first, second and third inputs of the communication adapter with an external device, the fourth input of which is connected to the fifth output of the control unit, the fourth and fifth outputs of the device are connected to according to the first and second outputs of the communication adapter with an external device, the fourth and fifth inputs of the device are connected respectively to the fourth and fifth inputs of the communication adapter with an external device, the third output of which is connected to the fourth input of the microinstruction address generation unit, the fourth output of the link adapter zi — with the external device connected to the third input of the register; the second input, which is connected to the fourth input of the communication adapter; tl channel. The disadvantage of this device is its limited scope, which does not allow connecting several groups of external devices to a single I / O channel. The purpose of the invention is to expand the field of application of the device by increasing the number of interfaced external devices and organizing the priority selection of groups of external devices operating in a block-multiplex mode. The goal is achieved by the fact that a sample signal switching unit is inserted into the firmware interface device, the input is connected to the sixth input of the device and the fifth input of the microcommand address generation unit, the output is the sixth output of the device, and the group of inputs is connected to the output group of the unit management FIG. 1 is a block diagram of the device; in fig. 2 - the structure of connecting external devices to the computer input-output channel; The device (Fig. 1) contains an adapter 1 for communicating with the input-output channel; unit 2 for generating the address of the microcomand; generator 3; registering the k commands, decoder 5 microcommands, control unit 6, command register 7, adapter 8 for communication with an external device, data register 9, register 10, data sampling switching unit -11, including AND 12 and 13, trigger 1 and counter 15, first second and third inputs and outputs 16 4 devices, the fourth and fifth inputs and outputs of the device 17, the sixth input 18 and output 19 roystva. The connection of several external devices (Fig. 2) to one input-output channel 20 is carried out by connecting the inputs and outputs 16 of the firmware microprogramming devices 21 to the common line, and the output of the sampling circuit from the channel. 20 is connected to the input 18 of the first device 21 (closest to the channel), the output 19 of which is connected to the input 18 of the second device 21, etc. The output 19 of the last device is connected to the sample input of the channel 20. Each external device 22 (or a group of the same type) is connected to the inputs and outputs 17 of the device 21. The device operates as follows. If it is necessary to exchange, block 6 blocks element I 13 and prepares element AND 12, which generates a switching signal for trigger H when a signal is received from the channel at input 18 of the device. Trigger switching And a single state blocks an element of AND 13 and the passage of a sample to exit 19 for the entire duration of the exchange. If this device is not ready to be exchanged, the signal from the output of block 2 blocks element 12 and prepares element 13. So that the sampling signal arriving at device 18 is transmitted to output 19 and arrives at the next priority device. When executing the main processor program, the central processor encounters an I / O command (for example, Start I / O), in which the channel number and the slave number are indicated. The specified channel samples the channel address word and the channel control word in the memory, which indicate the data array to be transmitted, the starting address of the array, and the I / O operation code. The channel expands the sequence of I / O interface signals, during which the direct exchange of information between the channel and the interface device occurs. For this, the channel sends signals to the control input of adapter 1, simultaneously sends a permission signal for the exchange to the input of block 11, the address 5, 9 of the external device via information buses to the corresponding input of the adapter 1, the permission signal for the exchange arrives simultaneously to the input of block2 in accordance with signals from generator 3 to form the micro-command address, which goes from the register output to the device output. In response to this, the channel to the corresponding input of the device issues the required micro-command, which enters the register, decodes in the decoder 5 signals from which enters block 6, where the direct generation of the SI-1 signals for controlling the device nodes occurs. Assume the channel; refers to the device in question, therefore, the signals from block 6 / compare the device address and the channel address, and as a result of the comparison, adapter 1 generates a call to the address of the microinstructions in block 2, the next microinstruction is received and the exchange is received. equalization and information signals with the channel. In case of unbalancing of the addresses, block 6 generates a control signal that permits the passage of the allowance signal to the exchange to the lower priority device, which follows the 1m device, and so on. After the addresses in the adapter 1 are compared, the address of the next microcommand is generated by block 2, the field of this microcommand is decoded by decoder 3, and the signals of block 6 are generated, the adapter 1 outputs the response signals to the device output. The channel to the information buses delivers information to be transmitted to an external device and accompanies these actions by 1 data to the control input of the adaptea 1 control signals as known; Noah procedure is sampled from; memory microcommand. Block 6 generates control signals to write the command, data, and address to registers 7, 9, and 10, and this information is transmitted to adapter 8 by the signal from block 6, after which adapter 8 begins to flash. , 6 is exchanged with an external device. By submitting information to the control and information outputs of the device to be transmitted and accompanied by control and identification signals. In response to these signals, the external device exposes the control inputs and the information inputs of adapter B to the control signals and data. Receiving a control response signal, adapter 8 generates a demand for generation of microcommand addresses, receiving which and decoding its field, block 6 generates control signals for transmitting information1 (and from adapter C to register 9). Then a new microcommand address is generated by the signal From the decoder 5 and the contents of the register 9 is transferred to the adapter 1 and further along the information buses to the information output of the device to the channel. This completes the data transfer from the channel to the external device and vice versa. Thus, the proposed device The trio provides an extension of the functionality of the system as a whole due to the appearance of the possibility of priority connection to the I / O channel of a number of external devices, which makes it possible to increase the flexibility of the system when it is expanded. In order to expand the scope of application by increasing the number of interfaced external devices, a switching unit of the sampling signal is inserted in it, the input of which is connected to the sixth input of the device and fifth in by the path of the microcommand address generation unit, the output is the sixth output of the device, the group of inputs is connected to the group of outputs of the control unit. Sources of information taken into account in the examination 1. USSR author's certificate H, cl. G About F C / O, 1977 (prototype). " I5j