Control Data Cyber 170 State Hardware Reference Manual page 32

Instruction Section
l
nstruction Control Sequences
The instruction control section performs instruction translation and control
sequences. Each control sequence obtains the necessary instruction operands
from the operating registers and provides the control signals for execution.
Instructions read from CM are 60-bit instruction words that are in four 15-bit
groups, two 30-bit groups, or a combination of 15-bit and 30-bit groups. The
15-bit groups are termed parcels with the first parcel (parcel 0 ) being the
highest-order 15 bits of a 60-bit CM word.
Second, third, and fourth parcels
(parcels 1, 2, and 3) follow in order. The 30-bit groups contain two 15-bit
parcels.
The instruction control sequences control the execution of one or more
instructions of a common type. These sequences and associated instructions are
briefly described in this chapter. For further information, refer to CP
Instruction Descriptions in chapter 4 .
8001ean Sequence
The Boolean sequence controls instructions that require bit-by-bit data
manipulation. This includes both the logical and transmissive operations. The
instructions requiring logical operations are:
1 1
Logical product (Xj) and (Xk) to Xi
12 Logical sum of (Xj) and (Xk) to Xi
13
Logical difference of (Xj) and (Xk) to Xi
15 Logical product of (Xj) with complement of
(Xk)
to Xi
16 Logical sum of (Xj) with complement of (Xk) to Xi
17 Logical difference of (Xj) with complement of
(Xk) to Xi
The instructions requiring transmissive operations are:
10 Transmit (Xj) to Xi
14 Transmit complement of (Xk) to Xi
BXi Xj
*
Xk
BXi Xj
+
Xk
BXi Xj
-
Xk
BXI -Xk
*
X
j
BXi -Xk
+
Xj
BXI Xj
BXi
-
Xk