PM5352 datasheet(32/77 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

RENB

Input

(POS)

P22

POS-PHY Receive multi-PHY Read Enable

(RENB).

The S/UNI-STAR supports both byte-level and

packet-level transfer. Packet-level transfer operates

as described above, with a selection phase when

RENB is deasserted and a transfer phase when

RENB is asserted. While RENB is asserted,

RADR[2:0] is used for polling RPA. Byte level

transfer works on a cycle basis. When RENB is

asserted data is transferred from the selected PHY

and RADR[2:0] is used to select the PHY. Nothing

happens when RENB is deasserted. Polling is not

possible; packet availability is directly indicated by

DRPA.

During a data transfer, RVAL shall be monitored

since it will indicate if the data is valid. Once RVAL

is deasserted, RENB or RADR[2:0] must be used to

select a new PHY for data transfer.

RENB must operate in conjunction with RFCLK to

access the FIFO’s at a high enough rate to prevent

FIFO overflows. The system may de-assert RENB

at anytime it is unable to accept another byte.

RENB is sampled on the rising edge of RFCLK.

RADR[2]

RADR[1]

RADR[0]

Input

(ATM)

R23

P20

R22

Receive Address (RADR[2:0]). The RADR[2:0] bus

is used for device selection and device polling in

accordance with the Utopia Level 2 standard.

When RADR[2:0] is set to the same value as the

PHY_ADR[2:0] inputs than the receive interface of

this S/UNI-STAR is either being selected or polled.

Note that the null phy address 7H is an invalid

address and cannot be used to select the S/UNI-

STAR.

RADR[2:0] is sampled on the rising edge of TFCLK.

PM5352 Datasheet(PDF) 32 Page - PMC-Sierra, Inc

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