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2 5-105-510
Figure 5-10 Boundary Scan Circuit Pack Access
5.2.2 CC Internal Buses
5.2.2.1 Bidirectional Gating Bus
The Bidirectional Gating Bus (BGB) is a 36-bit bus (32 data bits and 4 parity bits). The BGB is used to pass data
between the Central Control (CC) and various maintenance and diagnostic units. t is used to load and unload the
Writable MicroStore (WMS). Table 5-7 summarizes the BGB. Figure 5-11 is a functional block diagram of the
BGB.
The MLTS nterface and the CC are bus masters and have active control over the BGB. The MCH and UC are
passive receivers on the bus.
CATEGORY
SIGNAL
DATA
BGB(31-00)1
BGB(35-32)1
CONTROL
MCHGBR0
MLTENO0
MLTPP (2-0)
MLTRW0
HSR (23-16)
PPR (21-16)
Notes:
a.
NC = No Connection.
Table 5-7
Bidirectional Gating Bus (BGB)
TYPE
DESCRIPTION
Tristate
32 data bits, noninverted
Bidirec-
4-byte even parity bits over 32
tional
data bits
Bus release request to Control
Unit
Enable WMS access by MLTS
via BGB
Clocking pulses for WMS
address, low data, and high data
WMS access direction by MLTS
BGB sources, destinations,
direction, and enable
Pulse point register bits 21-16 for
BGB accesses
Copyright © 1999 Lucent Technologies
MLTS
CC
MCH
/O
/O
/O
/O
/O
/O
/O
N
NC
/O
N
NC
/O
N
NC
/O
N
NC
NC
/O
N
NC
/O
N
July 1999
UC
/O
NC a
NC
NC
NC
NC
N
N
Page 22
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