PM7344 datasheet(42/293 Pages) PMC

42 / 293 page

PM7344 S/UNI-MPH

DATA SHEET

PMC-950449

ISSUE 6

MULTI-PHY USER NETWORK INTERFACE

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

Pin Name

Type

No.

Function

RRDMPHB

Input

Receive Multi-Phy Read Enable (RRDMPHB).

The RRDMPHB signal is available on this pin

when input MPHEN is high. RRDMPHB is used

to initiate reads from the receive FIFOs. When

sampled low using the rising edge of RFCLK, a

byte is read from the receive FIFO selected by

the RRA[1:0] address bus (if one is available)

and output on bus RDAT[7:0]. When sampled

high using the rising edge of RFCLK, no read is

performed and RDAT[7:0] and RSOC are

tristated. RRDMPHB must operate in

conjunction with RFCLK to access the FIFOs at

a high enough instantaneous rate as to avoid

FIFO overflows. The ATM layer device may

deassert RRDMPHB at anytime it is unable to

accept another byte.

RRDENB[1]

Receive Read Enable PHY #1 (RRDENB[1]).

The RRDENB[1] signal is available on this pin

when input MPHEN is low. RRDENB[1] is used

to initiate reads from the receive FIFO of PHY

#1. When sampled low using the rising edge of

RFCLK (and the remaining three RRDENBs

remain high), a byte is read from PHY #1's

synchronous FIFO and output on bus RDAT[7:0]

if one is available. When sampled high using

the rising edge of RFCLK, no read is performed

and RDAT[7:0] and RSOC are tristated.

RRDENB[1] must operate in conjunction with

RFCLK to access the FIFOs at a high enough

instantaneous rate as to avoid FIFO overflows.

The ATM layer device may deassert RRDENB[1]

at anytime it is unable to accept another byte.

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