PM5352 datasheet(27/77 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

DTPA

Output

(POS)

K22

POS-PHY Direct Transmit Packet Available (DTPA).

These output signals provide direct status indication

of when some programmable number of bytes is

available in the transmit FIFO, for the

corresponding port. When transitioning high, DTPA

indicates that the transmit FIFO has enough room

to store data. The transition level is selected by the

TXFP Transmit Packet Available Low Water-mark

(TPALWM[7:0]) register. When DTPA transitions

low, it indicates that the transmit FIFO is either full

or near full as selected by the TXFP Transmit

Packet Available High Water-mark (TPAHWM[7:0])

system with some look ahead capability in order to

avoid FIFO overruns and smoothly transition

between PHY’s.

DTPA are updated on the rising edge of TFCLK.

TMOD

Input

(POS)

F22

POS-PHY Transmit Word Modulo (TMOD) signal.

TMOD indicates the size of the current word. TMOD

is only used during the last word transfer of a

packet, at the same time TEOP is asserted. During

a packet transfer every word must be complete

except the last word, which can be composed of 1

or 2 bytes. TMOD set high indicates a 1-byte word

(present on MSB’s, LSB’s are discarded) while

TMOD set low indicates a 2-byte word.

TMOD is considered valid only when TENB is

simultaneously asserted and the S/UNI-STAR is

selected via TADR[2:0].

TMOD is sampled on the rising edge of TFCLK.

PM5352 Datasheet(PDF) 27 Page - PMC-Sierra, Inc

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