PM5352 datasheet(22/77 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

TENB

Input

(POS)

J22

POS-PHY Transmit Multi-PHY Write Enable (TENB)

signal.

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

packet-level transfer. Packet-level transfer operates

in a similar fashion to Utopia, with a selection phase

when TENB is deasserted and a transfer phase

when TENB is asserted. While TENB is asserted,

TADR[2:0] is used for polling PTPA and the

currently selected PHY status is provided on STPA.

Byte level transfer works on a cycle basis. When

TENB is asserted, data is transferred to the

selected PHY. Nothing happens when TENB is

deasserted. Polling is not available and packet

availability is indicated by DTPA.

TENB is sampled on the rising edge of TFCLK.

TADR[2]

TADR[1]

TADR[0]

Input

(ATM)

G21

H20

G22

Transmit Address (TADR[2:0]). The TADR[2:0] bus

is used for device selection and device polling in

accordance with the Utopia Level 2 standard.

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

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

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

Note that the null-phy address 0x7 is an invalid

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

STAR.

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

TADR[2]

TADR[1]

TADR[0]

Input

(POS)

G21

H20

G22

POS-PHY Transmit Write Address (TADR[2:0])

signals.

The TADR[2:0] bus is used to select the FIFO (and

hence port) that is written to using the TENB signal.

In packet level transfer mode, TADR[2:0] is also

used for polling on PTPA.

Note that address 0x7 is the null-PHY address and

cannot be used to select theS/UNI-STAR.

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

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