| MIL-STD-1750A: Standard sixteen-bit computer architecture | ||
|---|---|---|
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Addr
Mode Mnemonic Format/Opcode
8 4 4
----------------------
R DVR RA,RB | D1 | RA | RB |
----------------------
8 4 4
----------------------
ISP DISP RA,N | D2 | RA | N-1 | 1 <= N <= 16
----------------------
8 4 4
----------------------
ISN DISN RA,N | D3 | RA | N-1 | 1 <= N <= 16
----------------------
8 4 4 16
D DV RA,ADDR --------------------------------------
DX DV RA,ADDR,RX | DO | RA | RX | | ADDR |
--------------------------------------
8 4 4 16
--------------------------------------
IM DVIM RA,DATA | 4A | RA | 6 | | DATA |
--------------------------------------
Description. The contents of register RA are divided by the Derived Operand, DO, a single precision, 2's complement number. The result is stored in registers RA and RA+1 such that RA stores the single precision integer quotient and RA+1 stores the remainder. The Condition Status, CS, is set based on the result in RA. A fixed point overflow occurs if the divisor, DO, is zero, or if the dividend is 800016 and the divisor is FFFF16.
Note: The sign of the non-zero remainder is the same as the sign of the dividend.
Register Transfer Description.
(RA,RA+1) <-- (RA) / DO;
PI4 <-- 1, if DO = 0 or {RA = 8000
16 and DO = FFFF16};
(CS) <-- 0010 if (RA) = 0;
(CS) <-- 0001 if (RA) < 0;
(CS) <-- 0100 if (RA) > 0;
Registers Affected. RA, RA+1, CS, PI