AT&T 3B2/300 Technical Reference Manual page 408

- - - - - - - - - - - - - - - - - - - - - - - - - - - FUNCTIONAL DESCRIPTION
TO/FROM
SYSTEM
BOARD
-
-
-
- -
CM193A/B BACKPLANE
CARD SELECT 15-05 (PCS15-05[0])
DATA ACKNOWLEDGE (PDTACK[O])
BUS ACKNOWLEDGE (PBACK[O])
INTERRUPT ACKNOWLEDGE (PIAK2-0[0])
CARD SELECT (PCS04-01[0])
INTERLOCK OPERATION (PLOCK[O])
ADDRESS BITS 23-00 (PA23-00[1])
DATA BITS 15-00 (PD15-00[1])
ADDRESS STROBE (PAS[O])
DATA STROBES (PDSl-0(01)
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 (V12N)
+sv cvcq
GROUND
+12V (V12P)
BUS TERMINATING
RESISTORS
r----------,
TYPICAL PULLUP
TERMINATION
+sv
,,
. ~
330 .~
OHM~
L----------.J
NC
-
FEATURE CARD 1
THROUGH
FEATURE CARD 4
CONNECTORS
-
-
-
PIN 11
-
PIN 03
-
PINS 17, 40, AND 64
PIN 01
r-----------,
TYPICAL BUS
TERMINATION
+5V
,,
390
~
OHM~
,::..
560 OHM
-
........
Frrr_l_
L--------- - .J
Figure 3-48: CM193A/B (3B2/300 and 310) Backplane - Functional Block Diagram
FUNCTIONAL DESCRIPTION 3-155