AT&T 3B2/300 Technical Reference Manual page 286

- - - - - - - - - - - - - - - - - - - - - - - - - - - - FUNCTIONAL DESCRIPTION
CM190A/ED-4C637-30 SYSTEM BOARD
r--------,
FROM
INTERRUPT
PERIPHERAL INTERRUPTS
I
I
1'?NEi%~~ _ . ,
LOGIC
I
BACKPLANE
I
SOURCES
PA23-00[IJ
I I
ADDRESS GENERATION I
CONNECTOR
I
CHIP SELECTS 15-00[0]
' ~
AND LOGIC CIRCUITS
I
WAIT STATE
AND STROBE
GENERATION
CIRCUITS
CENTRAL
PROCESSING
UNIT AND
MEMORY
MANAGEMENT
UNIT
382/300:
WE 32002
382/310/400:
WE 32100
WE 32101
D3!-00[IJ
I
~f-.
WE 32106
MATH
ACCELERATION
UNIT
(OPTIONAL
ON ED-4C637-30)
SYSTEM CLOCK
CM! 90A: 7.2 MHz
ED-4C637-30:
8.2 MHz
10MHz
MOS DATA BUS
TRANSCEIVER
CIRCUITS
CLOCKS
(DIVIDED FROM 20MHz)
o 10 MHz
o 5 MHz
o 2 MHz
o I MHz
o 100 KHz
PDIS-00[1]
I
I
I
I
A31-00[IJ D07-00[!J
L--------.J
DUAL PORT
r--------,
MUXA9-0[IJ
I RANDOM I
DYNAMIC RANDOM
.
ACCESS
I
ACCESS MEMORY
-
.
MEMORY I
LAOS-02[1]
D07-00[!J CONTROLLER
: CONNNECTORS :
AND ARBITER
MD31-00[l]
MPAR30[!]
I I
L--------.J
A31-00[1]
D31-00[IJ
t
A23-00[1]
D3!-00[l]
D!S-00[1] AOS-02[1]
D07-00[IJ AIS-00[1]
CONTROL AND
DIRECT MEMORY
STATUS ACCESS CONTROLLER
REGISTER
AND LOGIC CIRCUITS
I
OMA
UMA LJNir
l
CHANNELS
CHANNELO
CHANNEL I
2AND3
HARD DISK FLOPPY DISK
DUAL UNIVERSAL
CONTROLLER
CONTROLLER
ASYNCHRONOUS
RECEIVER/
D31-00[IJ
TRANSMITTER
r - - - -
_l _ ----,
I HARD DISK I
r ____
j _____ ,
FLOPPY
r ____
j _____ ,
CONSOLE
D31-08[1]
DRIVE
: DISK DRIVE :
I
AND CONTTY
I
: CONNECTORS :
I
CONNECTOR
I
: CONNECTORS :
'-
D7-0[!J
MMD7-0[1]
L-----------.J L----------.J
L----------.J
"
D31-00[IJ
AIS-02[1]
READ ONLY
MEMORY
(32K BYTES
OR 64K BYTES)
D03-00[IJ
All-02[1] D03-00[l] AOS-02[1] D07-00[l] A03-02[1]
,
,
,
ST A TIC RANDOM
TIME-OF-DAY
TIMERS 0,
ACCESS MEMORY
CLOCK
1, 2, AND
CIRCUITS
LOGIC
(lK X 4 BITS)
CIRCUITS
Figure 3-13: Version 2 3B2 Computer System
Board - Functional Block Diagram
FUNCTIONAL DESCRIPTION 3-33