PM5345 datasheet(39/196 Pages) PMC

39 / 196 page

PM5345 S/UNI-155

DATA SHEET

PMC-930305

ISSUE 4

SATURN USER NETWORK INTERFACE

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

Pin Name

Type

No.

Function

TSEN

Input

109

The tristate enable (TSEN) input selects the

configuration of the receive datapath

(RDAT[15:0]). When TSEN is tied high,

RDAT[15:0] normally operates as a tristate bus

controlled by RRDB. When RRDB is high,

RDAT[15:0] is tristated. When RRDB is low,

RDAT[15:0] is enabled. When TSEN is tied

low, RDAT[15:0] normally operates as an

output bus, and is always enabled, regardless

of the state of RRDB

BUS8

Input

110

The bus width select (BUS8) input selects the

transmit and receive datapath widths. When

BUS8 is tied high, a 9-bit interface consisting

of a start of cell indication, and an 8-bit octet

bus is selected. When BUS8 is tied low, a 17-

bit interface consisting of a start of cell

indication, and a 16-bit word bus is selected.

RRDB

Input

111

The active low receive read strobe (RRDB) is

used to read ATM cells from the receive FIFO.

When active, RRDB must cycle at a 25 MHz or

lower instantaneous rate, but at a high enough

rate to avoid FIFO overflow. RSOC is updated

on the rising edge of RRDB. RDAT[15:0] are

updated on the falling edge of RRDB.

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