PM4354-PI datasheet(42/463 Pages) PMC

42 / 463 page

RELEASED

PM4354 COMET-QUAD

DATASHEET

PMC-1990315

ISSUE 6

FOUR CHANNEL COMBINED E1/T1/J1

TRANSCEIVER / FRAMER

PROPRIETARY AND CONFIDENTIAL TO PMC-SIERRA, INC. AND FOR ITS CUSTOMERS’ INTERNAL USE

Pin Name

Type

Pin No. Function

Microprocessor Interface

A[0]

A[1]

A[2]

A[3]

A[4]

A[5]

A[6]

A[7]

A[8]

A[9]

A[10]

Input

B13

A14

B14

A15

B15

A16

B16

C15

C16

D16

D15

Address Bus (A[10:0]). This bus selects specific registers during COMET-

QUAD register accesses.

RDB

Input

D14

Active Low Read Enable (RDB). This signal is low during COMET-QUAD

contents of the addressed register while RDB and CSB are low.

WRB

Input

E15

Active Low Write Strobe (WRB). This signal is low during a COMET-QUAD

addressed register on the rising WRB edge while CSB is low.

CSB

Input

E16

Active Low Chip Select (CSB). CSB must be low to enable COMET-QUAD

internal test modes. If CSB is not used, it should be tied to an inverted

version of RSTB, in which case, RDB and WRB determine register

accesses. To ensure normal operation, the RSTB pin should be driven low

and the CSB pin driven high concurrently following power up.

ALE

Input

E14

Address Latch Enable (ALE). This signal is active high and latches the

address bus contents, A[10:0], when low. When ALE is high, the internal

address latches are transparent. ALE allows the COMET-QUAD to interface

to a multiplexed address/data bus. The ALE input has an internal pull up

resistor.

INTB

Output

F15

Active low Open-Drain Interrupt (INTB). This signal goes low when an

unmasked interrupt event is detected on any of the internal interrupt sources.

Note that INTB will remain low until all active, unmasked interrupt sources

are acknowledged at their source at which time, INTB will tristate.

RSTB

Input

E13

Active Low Reset (RSTB). This signal provides an asynchronous COMET-

QUAD reset. RSTB is a Schmidt triggered input with an internal pull up

resistor.

PM4354-PI Datasheet(PDF) 42 Page - PMC-Sierra, Inc

PM4354-PI Datasheet(HTML) 42 Page - PMC-Sierra, Inc

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