PM7344 datasheet(45/293 Pages) PMC

45 / 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

RCAMPH

I/O

Receive Multi-Phy Cell Available (RCAMPH).

The RCAMPH signal is output on this pin when

input MPHEN is high. This signal indicates

when a cell is available in the receive FIFO for

the port selected by RRA[1:0]. RCAMPH can be

configured to be deasserted when either zero or

four bytes remain in the selected/addressed

FIFO. RCAMPH will thus transition low on the

rising edge of RFCLK after the 53rd or 48th byte

has been output if the PHY being polled is the

same as the PHY in use .

RRDENB[4]

Receive Read Enable PHY #4 (RRDENB[4]).

The RRDENB[4] signal is input on this pin when

input MPHEN is low. RRDENB[4] is used to

initiate reads from the receive FIFO of PHY #4.

When sampled low using the rising edge of

RFCLK (and the remaining three RRDENBs

remain high), a byte is read from PHY #4'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[4] 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[4]

at anytime it is unable to accept another byte.

RDAT[0]

RDAT[1]

RDAT[2]

RDAT[3]

RDAT[4]

RDAT[5]

RDAT[6]

RDAT[7]

Tristate

Output

Receive Cell Data Bus (RDAT[7:0]). This bus

carries the ATM cell octets that are read from

the selected receive FIFO. RDAT[7:0] is

updated on the rising edge of RFCLK and is

tristated when RRDENB[n]/RRDMPHB is high.

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