PM5371TUDX
DATA SHEET
PMC-920525
ISSUE 6
SONET/SDH TRIBUTARY UNIT CROSS CONNECT
Pin Name Type
Pin Function
No.
CS2B
Input
18
The active low chip select #2 (CS2B) signal is low
during TUDX register accesses.
If CS1B and CS2B are not required (i.e., registers
accesses are controlled using the RDB and WRB
signals only), CS1B and CS2B must be connected to
an inverted version of the RSTB input.
RDB
Input
102 The active low read enable (RDB) signal is low during
TUDX register read accesses while in Intel bus mode
(MBEB = 1). The TUDX drives the D[7:0] bus with the
contents of the addressed register while RDB, CS1B,
and CS2B are low.
E
Input
Input
102 The active high external access (E) signal is high
during TUDX register access while in Motorola bus
mode (MBEB = 0).
WRB
101 The active low write strobe (WRB) signal is low during
a TUDX register write accesses while in Intel bus
mode (MBEB = 1). The D[7:0] bus contents are
clocked into the addressed register on the rising WRB
edge while CS1B and CS2B are low.
RWB
The read/write select (RWB) signal selects between
TUDX register read and write accesses while in
Motorola bus mode (MBEB = 0). The TUDX drives the
D[7:0] bus with the contents of the addressed register
while CS1B and CS2B are low and RWB and E are
high. The D[7:0] bus contents are clocked into the
addressed register on the falling E edge while CS1B
and CS2B and RWB are low.
PROPRIETARY AND CONFIDENTIAL TO PMC-SIERRA, INC., AND FOR ITS CUSTOMERS’ INTERNAL USE
18
PMC [ PMC-SIERRA, INC ]
