SU723572A1 - Microprogramme control device - Google Patents

Description

The invention relates to digital computing and automation and can be used in firmware control devices of digital computers.

Known firmware control devices containing a memory unit for micro-commands and a control unit [1] and [2].

A disadvantage of the known devices is the large amount of equipment.

The closest in technical solution is a microprogram control device containing a memory unit for micro-commands, a register of micro-commands and a control unit, the first input of which is connected to the first input of the device, the output of the device is connected to the main output of the register of micro-commands, the input of which is connected to the output of the memory unit of micro-commands [3] .

The disadvantage of this device is the large amount of memory block memory microcommands.

The subject of the invention is the reduction of the memory volume of the micro-command storage unit, the goal is achieved by the fact that in the device containing the micro-command memory block, the micro-command register, the first output of which is the device output, and the micro-command register inputs are connected to the micro-command memory block outputs, an associative attribute memory block is introduced, mask register, display register and sign register, the outputs of which are connected to the inputs of the block of associative memory of signs, the outputs of which are connected to the inputs of the display register, the outputs of of which are connected to the inputs of the micro-command memory block, the mask register output is connected to the first input of the feature register, the second input of which is connected to the second output of the micro-command register, the third output of which is connected to the first input of the mask register, the second input of which is the device input.

In FIG. 1 shows a block diagram of a firmware control device; on Fig, 2 is an example of a graph of the firmware; ne. FIG. 3 is a table of contents of a micro-instruction storage unit; in Fig. 4 is a table of contents of a feature block.

The microprogram control device comprises a micro-command memory block 1, a micro-command register 2, an associative characteristic memory block 3, a mask register 4, a characteristic register 5 and an indication register 6. The micro-command register 2 consists of three parts: a control part, a part storing the mask code and a part, storing the name of the microcommand complex. The output of the control part of the register of microcommands 2 is the output of the entire firmware control device. The output of the microcommand register part 2 storing the mask code is connected to the first input of the mask register, and the output of the microcommand complex register part name is connected to the second input of the feature register. The register of signs 5 consists of two parts: the part containing the code of logical conditions, and the part containing the code of the name of the complex. The input of the attribute register part 5 containing the logical condition code is connected to the output of the mask register 4, and the input of the attribute register part 5 containing the code for the name of the micro-command complex is connected to the output of the micro-command register 2.

We consider the operation of the microprogram control device using an example of microprogram execution, where (i - 0.17) is the control part of the microcommand, ag ^ () = 0.7) is the name of the microcommand complex, the codes of which are selected in one call to the microcommand memory block and are processed sequentially in the manner dictated by the firmware. The placement of the firmware in the micro-instruction memory block and in the attribute associative memory block is shown in FIG. 3 and FIG. 4 respectively.

The microcommand codes codes are stored in the microcommand memory block cell; · mask codes that have a bit capacity equal to the number of logical conditions (Р ^, Р ₂ , Pg) and the microcommand complex name code, the mask code contains units in those digits that interrogate the values of logical conditions that affect choosing the path of the firmware. Each cell of the block of associative memory of signs (Fig. 4) consists of two fields: field 1 is used to store the values of logical conditions, P ₂ , and field m is used to store the code of the name of the microcommand complex. The bits of field I of the block of associative memory of signs that do not participate in the comparison are in the state '' 0 '

At the initial moment of time, the name of the complex S _{o is} received in the corresponding field of the register of signs 5, the remaining bits of the register of signs 5 are in the state '' O ' ¹ . The contents of the register of signs 5 and the contents of the cells of the block of associative memory of signs 3 are compared and a signal is generated that matches the contents of the first cell of the block of associative memory of signs 3, which sets the trigger of display register 6 corresponding to the first cell of the memory block of microcommands to a single state

1. When the display register 6 is interrogated, information containing the microcommand complex (, U _O , U, U,) is selected from the memory block of the micro-commands 1. The code 110 enters the register of mask 4. Let the logical conditions that affect the path of the microprogram execution at the moment have the values ρ _ή = 1, ρ _Ω = 0. In this case, the combination 100 is sent to the second input of the “sign register 5 in field 1, 100, and at the first entrance to the field P, the code for the name of the complex s _{4 is} from the micro-instruction register 2. When the contents of the register of signs 5 coincide with the contents of the third cell of the block of associative memory of signs 3, a coincidence signal is generated that sets the corresponding trigger register to a single state and indication 6, during the interrogation of which from the memory block of microcommands 1 information is selected containing the following complex of microcommands 9 _Oe (V _{? 1} at _vg at ₉ ), which is performed after the complex) with logical conditions p ^ = 1, p ₂ = 0, the meaning of the logical condition is indifferent.

The memory saving of the micro-memory memory block is achieved due to the fact that the number of complexes Gj is less than the total number of micro-commands.

With an increase in the number of microcommands in the complexes in this control device, only the amount of memory for storing microcommand codes increases, in comparison with the known one, the address part of the microcommand memory unit also increases. The device is effective due to its manufacturability (easily implemented on LSIs), flexibility and variability due to decomposition of the microprogram into a control graph and a table of complexes,

Claims (3)

1. US patent 3,748,649, cl. 340-172.5, 1973, 2. USSR author's certificate number 416696, cl. G06 F 9/16, 1971. 3. USSR author's certificate  342380, class G06 F 9/16, 1970 (prototype). (Started D) - S,  J