The control memory consists of 32 bit commands. Each command is divided into six fields. A command layout diagram with the name of each field and position (bit number) is shown in the table below, followed by a definition of each command field in the table Command Field Descriptions
BIT # |
31 28 |
27 25 |
24 22 |
21 20 |
19 17 |
16 0 |
FIELD NAME |
I/O Groups Control |
Reserved (0) |
Operation Code |
Register |
Condition |
Address |
COMMAND FIELD |
DESCRIPTION |
I/O Groups Control |
These bits control the direction of the I/O bits 31-28 pin groups as described in I/O Groups Control Field. |
Reserved, bits 27-25 |
Reserved for future versions. Must be set to 0. |
Operation Code, bits 24-22 |
These bits provide the command code as described in Operation Code Field . |
Register, bits 21 and 20 |
Specifies the internal register used with either the related command or the external event line number (0-3) conditions (see Sequencer Commands table), as described in Register Field table. |
Condition, bits 19-17 |
This field is the condition code for the related commands and the tree address MSBs for the JUMP FAR command (see Sequencer Commands). |
Address, bits 16-0 |
This field contains the address for branch commands: JUMP, LOOP, GOTO and CALL. When the Operations Code is set to the SET command, this field (bits 0-15) is used as data to be assigned to a register. |
I/O pins |
Control word bit# |
Control bit = 1 |
Control bit = 0 |
0-7 |
28 |
IN |
OUT |
8-15 |
29 |
IN |
OUT |
16-23 |
30 |
IN |
OUT |
23-32 |
31 |
IN |
OUT |
Mnemonic |
Additional fields |
Value |
Bit 24 |
Bit 23 |
Bit 22 |
NOP |
None |
0 |
0 |
0 |
0 |
JUMP FAR |
Destination = Condition & Address |
1 |
0 |
0 |
1 |
JUMP NEAR |
Condition & Address |
2 |
0 |
1 |
0 |
LOOP |
Reg, Address & Condition |
3 |
0 |
1 |
1 |
SET |
Reg & Address |
4 |
1 |
0 |
0 |
CALL |
Condition & Address* |
5 |
1 |
0 |
1 |
RETURN |
Condition |
6 |
1 |
1 |
0 |
PAUSE |
Condition |
7 |
1 |
1 |
1 |
HALT |
Condition = 7 |
7 |
1 |
1 |
1 |
* Address in the CALL is divided by 8 (see the table Sequencer Commands).
Register |
External Event Line # B (Table B-6) |
Bit 21 |
Bit 20 |
A |
0 |
0 |
0 |
B |
1 |
0 |
1 |
C |
2 |
1 |
0 |
D |
3 |
1 |
1 |
Condition |
Bit 17-19 |
Bit 19 |
Bit 18 |
Bit 17 |
None |
0 |
0 |
0 |
0 |
External event lines value > Register value |
1 |
0 |
0 |
1 |
External event lines value < Register value |
2 |
0 |
1 |
0 |
External event lines value = Register value |
3 |
0 |
1 |
1 |
External event lines value <> Register value |
4 |
1 |
0 |
0 |
External event line # B is Low* |
5 |
1 |
0 |
1 |
External event line # B is High* |
6 |
1 |
1 |
0 |
HALT when combined with PAUSE command |
7 |
1 |
1 |
1 |
* B is determined by the Register field
Condition Field