Advertisement
emit field (CX) to be
p~esented
to the B
register.
EMIT FIELD (Cl<):
The 4-bit CK field
allows the micro programmer to use con-
stants from the ROS.
When CK is used as
a B input, its 4-bit configuration is
presented to both the high order and the
low order 4 bits of the B-register.
Example: If the value in the CK field
is 0110, the value of 6 is presented to
both high and low positions of the B-
register.
DESTINATION (CD):
The 4-bit CD field
selects the destination of the ALU
output.
Note: A given register may be used as
bot~e
source and as the destination
during a single ROS cycle.
-A- CONTROL (CF):
The 3-bit CF field
controls the data bit presentation from
the A-register to ALU.
This field is
essentially bit significant, with a bit
for the high gate, a bit for the low
gate, and a bit for the straight or
cross switches.
The machine stop func-
tion is also found here.
-B- CONTROL (CG):
The 2-bit CG field
controls the high/low 4-bit gating from
3-18
the B-register to ALU.
There is no
straight/cross function for the B reg-
ister.
ARITHMETIC FUNCTION (CV):
The 2-bit CV
field is the true/complement and
binary/decimalcontrol~
The B-Register
input is the true/complement side of
ALU.
ARITHMETIC CONTROL (CC):
The 3-bit CC
field controls carry-in, carryout, AND,
OR, and exclusive OR fUnctions.
This
field also permits the setting of a
carryout into the carry latch, if
desired.
Storage Control (CM, CU)
•
Storage control fields (CM and CU)
will provide control for storage by:
1.
Section Selection (Main Storage,
local storage, or MPX 0-6).
2.
Operation-Read, Write, Compute,
Store.
3.
Storage address source (MN
source) •
The CM and CU fields work in conjunc-
tion with each other and their control
is best described considering both
fields, and some basic core-storage
cycling.
(Figure 3-18).
Advertisement
