AT&T 3B2/300 Technical Reference Manual page 287

FUNCTIONAL D E S C R I P T I O N - - - - - - - - - - - - - - - - - - - - - - - - - - -
CM190A/ED-4C637-30 SYSTEM BOARD
PERIPHERAL INTERRUPTS
r--------,
FROM
INTERRUPT
I
I
I~~E~?,.t~~ _ . ,
LOGIC
I
BACKPLANE
I
SOURCES
PA23-00[1]
I
I
ADDRESS GENERATION
CHIP SELECTS 15-00[0] I
CONNECTOR
I
h
-
AND LOGIC CIRCUITS
I
PD15-00[l]
I I
I I
j
I A31-00[1]
D07-00[1]
L--------.J
r--------,
WAIT STATE DUAL PORT
MUXA9-0[1]
I
RANDOM
I
AND STROBE DYNAMIC RANDOM
ACCESS
I
GENERATION ACCESS MEMORY
I
MEMORY
I
CIRCUITS LAOS-02[1]
D07-00[l]
CONTROLLER
: CONNNECTORS :
AND ARBITER
MD31-00[l]
MPAR30[1]
I
I
CENTRAL
L--------.J
PROCESSING
A31-00[l]
D31-00[1]
1
A23-00[l]
UNIT AND
MEMORY
MANAGEMENT
UNIT
382/300:
D31-00[1]
WE 32002
DIS-00[1] AOS-02[1] D07-00[1] AlS-00[1]
382/310/400:
WE 32100
WE 32101
CONTROL AND
DIRECT MEMORY
STATUS
ACCESS CONTROLLER
REGISTER
AND LOGIC CIRCUITS
D31-00[l]
'L-
I
''
DMA
WE 32106 UMA UMA
!
CHANNELS
MATH
CHANNEL 0
CHANNEL 1
2AND3
ACCELERATION
UNIT
HARD DISK FLOPPY DISK
DUAL UNIVERSAL
CONTROLLER CONTROLLER
ASYNCHRONOUS
(OPTIONAL
RECEIVER/
ON ED-4C637-30)
D31-00[!] TRANSMITTER
r - - - -
_t _ ----,
r _____
t ____ ,
r ____
j _____ ,
SYSTEM CLOCK
I HARD DISK I
FLOPPY CONSOLE
CM190A: 7.2 MHz
D31-08[1]
DRIVE
: DISK DRIVE :
I
AND CONTTY
I
ED-4C637-30:
"-
: CONNECTORS :
I
CONNECTOR
I
: CONNECTORS :
8.2 MHz
L-----------.J L----------.J L----------.J
10 MHz
D7-0[1]
MOS DATA BUS
MMD7-0[!]
TRANSCEIVER
CIRCUITS
"
CLOCKS ' ~
D31-00[l] AlS-02[1] D03-00[l] All-02[1]
D03-00[1] AOS-02[1] D07-00[1] A03-02[
(DIVIDED FROM 20MHz)
o 10 MHz
READ ONLY
o 5 MHz
MEMORY
o 2 MHz
(32K BYTES
0
1 MHz
OR 64K BYTES)
o 100 KHz
Figure 3-13: Version 2 3B2 Computer System
Board - Functional Block Diagram
3-34 TECHNICAL REFERENCE MANUAL
,
If
STATIC RANDOM TIME-OF-DAY
TIMERS 0,
ACCESS MEMORY
CLOCK
1, 2, AND
CIRCUITS
LOGIC
(lK X 4 BITS)
CIRCUITS
1]