IBM System/360 65 - 2065 BCU INTERFACE

Ie 3-cvcle storage request
WA271 {
PA + PB Bits
"
Ie 4-cycle storage request
D
3-c cle storaae reauest
Frame 1
I
D 4-cycle storage request Select
Frame 1 11·
Scan storage request
Store
IC storaae request
WA273
Sel key
D storaae reQUest
Insert key
3-cvcle access
Bu.
Cancel
Control
Store
Unit
CPU communicate
Sel key
logic
.Advance
In_key
Key advance
InMb11 __ requo ..
Storage protect check
BCU osclllato, (clock) Stor~e cxtdress check
Machine reset
1-----'
Storage data check
Error reset gate
I
Storage
I
Frame 1
I
Frame 1 11·
Bu.y
Test & Set
I Address
I
Power on
I
I
Decode
I
Test & Set
Advanc:e
L __ .. _-I
Gate Ie to SAB
Defeat Interleave
"
Processing
Gate D to SAB
1 •
Unit
Gate Scan to SAB
Main
Logic
Gate F to storage-key-in bus
Storage
Un;' (0)
Gd S I<> SOBI Channel request
Storage protect
check
BCU channe I response
Storaae address
check Address valid
Storage data
check
Data reauest
Inh"bit
stoDl CPU clock Channel aCCe~
Invalid cxldress
Invalid nddre
Mark bu. (and pa,lty) WA261
I
Sl<>rage-key-ln bus (and pa,lty) WA261
I
I
Starage-key-out bus (and parity) WA273
I
SAB (and parity) WA251
I
S081 (and aa,ltv) WA361
SOBO (and pa,lty) WA301
'\.
"
Legend:
"'Assume 2065 H
-
1'\
-
fest & Set
T
I/O
Channol(s)
Store
ChCl"lnel request
BCU channel response
Address valid
Data request
Channel
accept
Invalid address
'\.
"