AT&T 3B2/300 Technical Reference Manual page 416

- - - - - - - - - - - - - - - - - - - - - - - - - - - FUNCTIONAL DESCRIPTION
CM520A BACKPLANE
Diagnostic
4"'1E~l--4
Q
LED LED
~
Power __
LED
FR OM -
J-
POW ER
SUP PLY -
Connectors on
the Backplane
fl -"" ,vrn
-~-
l1
,ou /Vl?P\
-12V 1V12N\
,,.
I
From FLOPPY
'
DISK DRIVE
I
•
I
Floppy Data
Data Signals
Address Signals
Interrupt Signals
Bus Signals
RESET Signals
VCACHE
CONNECTOR
and Ctr!
/
I
From RESET
'- Switch /
I
From NVRAM
Battery
MCWeMrn,R
(VBKUiF--
PIN 11
PINS 17, 40, 64,
87, 90, 107, 110
FEATURE CARD 1
THROUGH
PIN 01
FEATURE CARD
7
PIN 03
CONNECTORS
Data Signals
Address Signals
Interrupt Signals
Bus Signals
RESET Signals
SYSTEM BOARD
Data Signals
Address Signals
Interrupt Signals
Bus Signals
RESET Signals
MD(31-00)
MCB(ll-00)
I~
MUXA(9-0)
BANKEN(2-0)
GO
CAS(3-0)
WE
RAS
SIZE(l-0)
SnEQUIP[O)
MEMORY CARD
CONNECTORS
(MEMO-ME Ml)
BUFFERED MICROBUS
CONNECTORS
(BUBO-BUB!)
Figure 3-52: CM520A (3B2/500) Backplane - Functional Block Diagram
FUNCTIONAL DESCRIPTION 3-163