AT&T 3B2/300 Technical Reference Manual page 381

FUNCTIONAL D E S C R I P T I O N - - - - - - - - - - - - - - - - - - - - - - - - - - -
TO/FROM
CPU
FROM
CPU
AND
1/0 BUS
TO/FROM
1/0 BUS
TO/FROM
CPU
TO
1/0
BUS
(
[
"
-
'
~"
(--
DYNAMIC RANDOM ACCESS MEMORY CONTROLLER
PPAI0-02[1]
I
ADDRESS GENERATION LOGIC
MUXA9-0[l]
I
(ADDRESS MULTIPLEXER)
DIOMST[O]
ROW[!]COL[O]
I
REFRESH
I
ENCAMUX[O]
LOGIC
PRIORITIZED
I
ACCESS
CONTROL
ARBITRATION
I
REQUESTS
-
SEQUENCER
SIGNALS
LOGIC I
h
REFRESH (REFREQ[l])
CONTROL
1/0-DRAM (LPBRQ[l])
r\.
SIGNALS
CPU-DRAM (CPUMEMRQ[l])
CPU-1/0 (CPUIORQ[l])
"'
ACCESS
REQUESTS
-'
I
I
REQUEST
CONTROL
GENERATOR
SIGNALS
u
PP A23-00[l]
BYPASS LOGIC
CONTROL
SIGNALS
If
PDIS-00(1]
BYTE
MD(3 l-OO[l]
-
ROTATE
-
DATA
UNIT
MULTIPLEXER
CIRCUIT
D31-00[l]
- -
FAULT (FLT[O])
PARITY
..._
GENERATION
WE[O]
MEMORY PARITY ERROR (MPARER[O])
AND
-
PERIPHERAL FAULT (PFLT[O])
CHECK
-
MPAR3-0[1]
-
CIRCUITS
-
Figure 3-36: Dynamic Random Access Memory Controller - Functional Block Diagram
3-128 TECHNICAL REFERENCE MANUAL
...
- -
-
-
-
-
-
.,,.
TO/FROM
RAM
CARDS