228 lines
12 KiB
Plaintext
228 lines
12 KiB
Plaintext
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7. Commands of the handing over of the management.
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═════════════════════════════════════════════════
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The Commands of given groups process the field of microcommand m/c BY4,
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which is a scheme of management 12-digits address of the microcommands
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and executes 16 microcommands.
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7.1. Selection of address of the transition.
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7.2. Command Descriptions of the handing over of management.
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7.3. Operands of the inputting of the condition.
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7.1. Selection of the address of switch.
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──────────────────────────────────────
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Many commands BY4 execute the modification of the counter of the micro-
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instructions, executing hereunder the transition on new microinstruction,
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not residing directly behind executed in memories of the microinstructions.
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The Other commands can execute the modification of the register of the
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address. All address and data for loading enter on BY4 with Buses of the
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Address of the Transition (BAT). On BAT data can enter with three buffers:
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- the buffer V;
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- the buffer M;
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- the buffer P.
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As can be seen from schemes situated below, each of these buffers is
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commuted with different source of data:
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- the buffer V sends on BAT the data from ROM vectors of transition m/c BH1;
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- the buffer M commute BAT and Data Bus (look on directive LINK M);
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- the buffer P sends on BAT data from ROM of microinstructions (field D);
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7.1.1. Structured scheme of the choice of the address of the switch.
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──────────────────────────────────────────────────────────────────
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┌─────────┐
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│ ROM EM │
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└────┬────┘
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┌┘
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════════╪═════════════╤════════════════════════════════╤══ BUS_D (16)
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└┐ │ │
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┌────┴────┐ ┌────┴────┐ ┌────┴────┐
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┌─o Buffer V│┌─o Buffer M│ ┌─o Buffer K│
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│ └────┬────┘│ └────┬────┘ OED└────┬────┘
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VE │ ME │ │
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═══════╧══════════╤═╧══════════════════╤═══ BAT(12) │
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│ │ /16
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┌─────────────────┴──────────┐ ┌────┴────┐ │
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│ ED4 │ ┌─o Buffer P│ │
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│ │ │ └────┬────┘ 12 │
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PE └───────/─────┤
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│
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field D ROM│
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7.2. Command Description of the handing over of the management.
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──────────────────────────────────────────────────────────
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If while inputting commands it is required to indicate the condition of its
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execution,then it is put after mnemonics of the command as first operand;if is
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it additionally required to indicate the direct address of the transition, or
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(for command LDCT) to assign new value of the register of the address RA, then
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numerical value (the mark) handles in command as a second operand:
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1) JZ - a transition to zero address;
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JZ; \ unconditional transition on zero address
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2) CJS - a conditional transition to subprogram on specified address;
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the address of the transition goes on BAT through buffer R;
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CJS CT, START; \ if condition CT is executed,
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\ then move to subprogram by adress
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\ START, otherwise continue calculations
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3) JMAP - an unconditional transition on specified address,residing on data
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bus; the address of the transition goes on BAT through buffer M;
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JMAP 100; \ move to address 100
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4) CJP - a conditional transition on specified address;
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the address of the transition goes on BAT through buffer R;
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CJP not RDM, CP; \ wait while memory will not give
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\ signal to readiness
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5) PUSH - a boot in stack of the counter of the microinstructions, and
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plus hereto on performing the specified condition of execution
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LDCT; value of the downloaded counter of the microinstructions
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enters on BAT through buffer M;
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PUSH not CT, 10; \ save in stack address of the following
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\command and load in RA 10,
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\ if condition CT is not executed;
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Form without operands writing the command PUSH is can be; then,
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the condition became false and, consequently, the boot in RA does
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not occur.
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6) JSRP - a transition to one of two subprograms by adress, taken from
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register of the address (if condition is not executed), or on
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specified address;
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the address of the transition enters on BAT through buffer P;
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JSRP IRQ0,53O;\ if condition is executed, then
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\ move to executing of the command by adress
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\ 43 (53o = 43), else
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7) CJV - conditional transition by adress from external sourse;
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the adress of transition gets on BAT from buffer V;
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CJV CT;\ if condition is executed, then
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\ the adress of next command is read
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\ from buffer V
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8) JRP - similar as command JSRP, but without boot in stack the address
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of the returning; the address of the transition enters on BAT
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through buffer P;
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9) RFCT - a recurrence of the cycle until the register of address is zero
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(the comparison RA with zero, and if no, then make a transition
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by adress, keeping on the top of the stack with simultaneous
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decremention of RA);
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PUSH NZ,10; \memorize on the top of the stack the address
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\of begining of hte cycle with simultaneous boot
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\in RA number of passage (RA executes the role
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\of counter of the cycle)
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....
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RFCT; \ decrements RA, and until zero
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\ move to the begining of the cycle
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10) RPCT - a recurrence of the cycle until the register of the address is a
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zero (the comparison RA with zero, and if no, then transition by
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adress, keeping in memories of the microinstructions with
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simultaneous decrementing of RA);
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the address of the transition enters on BAT through buffer P;
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RPCT loop; \ compare RA with zero and if RA <> 0,
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\ then move to the "loop"
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11) CRTN - a conditional returning of the subprogram;
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CRTN not NXORV; \ checking the sign of the overflow in
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\ system with extended net of the sign
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\ and if there is no overflows -
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\ - return from subprogram
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12) CJPP - a conditional transition on specified address and simultaneous
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decrementing of pointer of the stack;
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the address of the transition enters on BAT through buffer P;
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PUSH NZ,10;
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.....
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CJPP RM_C,NEXT; \ check C mark of register of the marks
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\ RM and if 1 then come out from cycle
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RFCT;
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13) LDCT - recording in register of the address RA;
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new value RA enters on BAT through buffer P;
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LDCT val; \ \ load in RA the value of val
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14) LOOP - a conditional breaking of the cycle (if condition in command
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is not executed, then address of the following microinstruction
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is chosen from top of the stack, else the following command
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executes`s);
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PUSH; \ \ save the address of the begining of the cycle
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......
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LOOP not CT; \if in the enterence CT - 0, then return to
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\ the begining of the cycle
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15) CONT - transition to performing of the following command (is
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executed by default);
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16) TWB - conditional branching by three directions (RA is compared with
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zero: if not, then RA decrement`s and then the LOOP executs,
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else the same LOOP, but with sample of the address not from
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stack, but from memory of the microinstructions through buffer P).
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PUSH NZ,10;
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.......
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TWB NZ,NEXT; \while RA<>0 return on the begining of the
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\ cycle; if RA=0 move on NEXT
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7.3. Operands of inputting the conditions.
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─────────────────────────────────────────
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The operands of the inputting of the condition are used in such commands
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as CJS, CJP, PUSH, JSRP, CJV, JRP, CRTN, CJPP, LOOP and TWB. The Signal of
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the condition is given on entry of LU block of microprogramming management
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through eight-entered multiplexor MS, two entries of which are beforehand
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predestined as Z and NZ (0 and 1), but the rest of six entries can be commuted
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by different signals (refer to inputting of switchings of the conditions with
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help of directives LINK). While inputting of the operand of the condition it
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is possible to use following predestined mnemonics:
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1)Z, NZ - condition is defined as undoubtedly false (true);;
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2)ZO, CO, NO, VO - signs of the zero, carrying, sign and overflows defined
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by result of the execution of operation in ALU;
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3)RM_Z,RM_C,RM_N,RM_V - the flags Z, C, N and V keeping in register of the
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marks RM;
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4)RN_Z,RN_C,RN_N,RN_V - similarly for RN;
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5)NXORV - sign of the overflow for system with two digits of signs;
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6)ZORC - condition is became true when there is a flag of zero or
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overflows in ALB after operation
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(ZORC = Z or C).
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7)L1,L2,L3,L4,L5,L6 - a direct inputting of the number of the entering
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of the multiplexor of the conditions, from which the condition signal will
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be scanned, and the installation of the signal will not be realized.
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Writing the operator "not" is applicable preliminary to all sign that
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influences upon field COM of microprogramming block of management BY4.
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All signals it is necessary to lock beforehand with one of the enterences
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(L1..L6) of the multiplexor by directive LINK .
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