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S/UNI-QUAD
PMC-Sierra, Inc.
PM5349 S/UNI-QUAD
DATASHEET
PMC-971239 ISSUE 6 SATURN USER NETWORK INTERFACE (155-QUAD)
Proprietary and Confidential to PMC-Sierra, Inc., and for its Customers’ Internal Use
24
Pin Name Type Pin
No.
Function
A[10]/TRS Input A11 The test register select (TRS) signal selects
between normal and test mode register accesses.
TRS is high during test mode register accesses,
and is low during normal mode register accesses.
RSTB Input
pull-up
B10 The active-low reset (RSTB) signal provides an
asynchronous S/UNI-QUAD reset. RSTB is a
Schmitt triggered input with an integral pull-up
resistor.
ALE Input
pull-up
C11 The address latch enable (ALE) is active-high and
latches the address bus A[7:0] when low. When
ALE is high, the internal address latches are
transparent. It allows the S/UNI-QUAD to interface
to a multiplexed address/data bus. ALE has an
integral pull-up resistor.
INTB Output
Open-
drain
C10 The active-low interrupt (INTB) signal goes low
when a S/UNI-QUAD interrupt source is active and
that source is unmasked. The S/UNI-QUAD may be
enabled to report many alarms or events via
interrupts.
Examples of interrupt sources are loss of signal
(LOS), loss of frame (LOF), line AIS, line remote
defect indication (LRDI) detect, loss of pointer
(LOP), path AIS, path remote defect indication
detect and others.
INTB is tristated when the interrupt is acknowledged
via an appropriate register access. INTB is an open
drain output.