B. CU - 0010
579
603
-
K=O 11 0
PI
K-W
This signifies a module change (the K field value specifying that the address of the next
microword is in the 600 block).
C. CU
=
0011
-
OQR-D
A,
~
100
RO
G7
00
01
10
1 1
If
a trap occurred at this point in a microprogram, the WX register which contains the ad-
dress of the next microword (100) is set into the FWX register (backup ROSAR). The CH
and CL fields are interrogated and set into the X6 and X7 buffer latches.
-
FWX-WX
This instruction sets the FWX register (backup ROSAR) back into the WX register (100)
and interrogates the X6 and X7 buffer latches to determine what the branching status was
at the time of the trap, thus the instruction establishes the link address (100), which is the
first word executed after the trap has been satisfied.
IBM Confidential
23

I' .
5 CA FIELD AND ALTERNATE CA FIELD-A REGISTER INPUTS
CA
=
0000 through 1111
- FT
+
This signifies the source for the input data to the A register.
6 CB FIELD-B REGISTER INPUTS
GB = 0000 through 00 II
- FT
+
R
This signifies the source of the input data to the B register.
7 CK FIELD-CONSTANT GENERATOR
K =
0010
- K=OOlO PO
G
+
K-R
This signifies that a constant of 2 (0010)
will
be generated on the K buss, and is the source
input data for the B register.
24
IBM Confidential
Previous Page Next Page