PM5352 datasheet(33/77 Pages) PMC

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PM5352 S/UNI STAR

DATA SHEET

PMC-1990421

ISSUE 2

SATURN USER NETWORK INTERFACE 155 (STAR)

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

Pin Name

Type

No.

Function

RADR[2]

RADR[1]

RADR[0]

Input

(POS)

R23

P20

R22

POS-PHY Receive Read Address (RADR).

The RADR signal is used to select the FIFO (and

hence port) that is read from using the RENB

signal.

The RADR bus is used to select the FIFO (and

hence port) that is written to using the TENB signal

and the FIFO's whose packet available signal is

visible on the PRPA polling output.

Note that address 0x7H is the null-PHY address

and will not be identified with the S/UNI-STAR.

RADR is sampled on the rising edge of RFCLK.

RCA

Output

(ATM)

N20

UTOPIA Receive multi-PHY Cell Available (RCA).

RCA indicates when a cell is available in the receive

FIFO ( when the STAR is selected by RADR[2:0]).

RCA can be configured to be de-asserted when

either zero or four bytes remain in the

selected/addressed FIFO. RCA will thus transition

low on the rising edge of RFCLK after Payload word

24 (RCALEVEL0=1) or 19 (RCALEVEL0=0) is

output if the PHY being polled is the same as the

PHY in use.

RCA is tristated when either the null-PHY address

(0x7H) or an address not matching the device

address is latched from the RADR[2:0] inputs when

RENB is high.

RCA is updated on the rising edge of RFCLK.

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