IBM System/370 145 Reference Summary page 29

Present Address
li
7
Not CPU Low Request
DF
D
E
c
0
D
E
.......
Addr
ICY
oc
Control
04
II
Next Address
Ne.rt
Addr
04
M Byte 2
M Byte3
00
D
M Byte 3 O A
ii~:;,'
14
10
24
28
3'
30
ICY
CTRL REG
BITS
1 2
3 4 5
CONTROL LINE
0
0
-
1
-
Command Branch Load
0 0
-
1
-
Force I
0 0
1 0 1 Command OP Load
0 0 1
0 1
Force TR
-
1 1
-
0
1 0 1
1
-
Command Prefetch
0 1 1 1
-
-
1
- -
0
OP Branch Command
1
-
-
-
0
0
1 0
-
1 L plus one
0 0 0
- -
Load OP, IMM Byte
-
1 0 0
-
Command Move 1-Bfr
1 0 0 1
-
1
-
-
1
-
Gate~and~
1 1
-
0
-
Gate
o
2
0
0
- -
0 Set Control Address
,
__
2--,__=:c::___J
3--,__u"o
4
5
2C.
=~
g;;:
Gate ICY to M-Reg (active when 1n DFI OR
RTN to ICY (activated by loRTN or
l1ATN and no interrupt)
CONTROL REGISTER DECODE
' C"
~<
;;'! ("')
u;·
0
Q)
3
Vi
3
0
~
8
0.
:::J "C
........
..... Cl)
Q.
<ti'
[ g.
C"
<
FUNCTION
Load 1-bfr O (1-Bfr 1
in
next cycle)
Gate I-Reg to B (and Address Adjust)
Load 1-Bfr 1 (1-Bfr 2 in the next cycle)
Gate TR-Reg to B (and Address Adjust)
Activate prefetch
Force TR to ADR ADJ Asm
(and B if OF 30 or OF 3C)
Use
Op-Reg to define the next Cxxx address; or go
to the Ahgn Routine
Force bits 7 and P of data being gated to L-Reg to be inverted for F LP long
Initial load of Op end IMM Byte
Used with I-Reg to activate the set
or reset of the 1-Bfr's
Used to gate the correct base or displacement
field from the 1-Bfr's O and 1 to L - low or B-Reg
Set next address for ICY sequence
;;;·
Q)
n
...
;;::·
Q)
[
C"
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...
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Cl)
n
0
..... .....
ill
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0
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9:
:::J
cc
.....
ill
!:.
...
0 .....
g..
Cl)
("')
0
:::J
...
.....
Q.
~.
l---1-++-1--++-+-+-+-+-+-+-++-1-++-+-!-l-+--Hh:'~,,~e~<,
~
...
'---1-1--!-'-+--+-l--+--+-1--+-+--l---l-l--+--l-+-!-l-l---+-k'~~~
{"
l---1-++-1--++-+-+-+-+-+-+-++-1-++-+-!-l-+--Hl~-~
.....
~
e-+-1-H--t++jH-+++++-~+++~~P~~'
l---1-1-:-1.:-l-:+-:-l-:-I-: l--:-l-:-1-: 1--:+-:-l - :-l . -l _ -: l--:+.:-1.:-l:-l--:+-:+-I:'
·~
"°" . . . . , , , .
l--'--!--++-+-HH--+--1-+-1-++-+-H-+-l-+-H-l-k"''"'<. ~
....,
L___L.L..LJL.L.L.JH--.L.JH--.L.L...LIH--.Ll..LJL.L...Lil'~~,,
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