AT&T 3B2/300 Technical Reference Manual page 410

- - - - - - - - - - - - - - - - - - - - - - - - - - FUNCTIONAL DESCRIPTION
TO/FROM
SYSTEM
BOARD
FROM
POWER
SUPPLY
-
CM194B BACKPLANE
CARD SELECT 15-13 (PCS15-13[0])
DATA ACKNOWLEDGE (PDTACK[O])
BUS ACKNOWLEDGE (PBACK[O])
INTERRUPT ACKNOWLEDGE (PIAK2-0[0])
CARD SELECT (PCS12-01(0])
INTERLOCK OPERATION (PLOCK[O])
ADDRESS BITS 23-00 (PA23-00[1])
DA TA BITS 15-00 (PD15-00[l])
ADDRESS STROBE (PAS[O])
DATA STROBES (PDSl-0[0])
DATA WIDTH (PSIZE16[0])
CARD FAILURE (PFAIL[O])
BUS FAULT (PFAIL[O])
BUS REQUEST (PBRQ[O])
BUS BUSY (PBUSY[O])
INTERRUPT REQUEST (PINT2-0[0])
SYSTEM RESET (SYSRST[O])
SYSTEM RESET REQUEST (RQRST[O])
BACKUP BATTERY (VBKUP)
-12V (Vl2N)
BACKPLANE
POWER
CONNECTOR
+5V (VCC)
PINS 05-01
GROUND
PINS 07-11
+12V (V12P)
PIN 12
BUS TERMINATING
RESISTORS
r----------,
TYPICAL PULLUP
TERMINATION
+5V
'
,•
330 ,~
OHM~~
.
L----------.J
NC
-
-
FEATURE CARD 1
THROUGH
FEATURE CARD 12
CONNECTORS
-
-
PIN 11
PIN 03
-
PINS 17, 40, AND 64 -
-
PIN 01
r-----------,
TYPICAL BUS
TERMINATION
+5v
,,
390 ,~
OHM~
. ~
560 OHM
........
.. ...... l
L--------- - .J
Figure 3-49: CM194B (382/400) Backplane - Functional Block Diagram
FUNCTIONAL DESCRIPTION 3-157