PM5352 datasheet(25/77 Pages) PMC

25 / 77 page

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

STPA

Output

(POS)

B19

POS-PHY Selected multi-PHY Transmit Packet

Available (STPA) signal.

STPA transitions high when a predefined

(TPAHWM[7:0] register bits) minimum number of

bytes is available in the selected transmit FIFO (the

FIFO that data is written into). Once high, STPA

indicates that the transmit FIFO is not full. When

STPA transitions low, it optionally indicates that the

transmit FIFO is full or near full (TPALWM[7:0]

indication for the selected PHY in order to avoid

FIFO overflows while polling is performed.

The PHY Layer device shall tristate STPA when

TENB is deasserted. STPA shall also be tristated

when either the null-PHY address (0x7H) or an

address not matching the address set by

PHY_ADR[2:0] is presented on the TADR[2:0]

signals when TENB is sampled high (deasserted

during the previous clock cycle).

STPA is only available in POS-PHY packet-level

transfer mode, as selected by the POS_PLVL

mode. STPA is updated on the rising edge of

TFCLK.

TFCLK

Input

(ATM)

K20

UTOPIA Transmit FIFO Write Clock (TFCLK).

This signal is used to write ATM cells to the four cell

transmit FIFOs.

TFCLK cycles at a 50 MHz or lower instantaneous

rate.

TFCLK

Input

(POS)

K20

POS-PHY Transmit FIFO Write Clock (TFCLK).

This signal is used to write packet octets into the

256 bytes packet FIFO’s.

TFCLK cycles at a 50 MHz or lower instantaneous

rate.

PM5352 Datasheet(PDF) 25 Page - PMC-Sierra, Inc

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