PM7346 datasheet(69/419 Pages) PMC

69 / 419 page

PM7346 S/UNI-QJET

DATASHEET

PMC-960835

ISSUE 6

SATURN QUAD USER NETWORK INTERFACE FOR J2, E3, T3

PMC-SIERRA, INC. PROPRIETARY AND CONFIDENTIAL TO PMC-SIERRA INC., AND ITS CUSTOMERS’ INTERNAL USE 48

Pin Name

Type

Pin No.

Function

RADR[4]

RADR[3]

RADR[2]

RADR[1]

RADR[0]

Input

P19

N17

P18

R20

R19

Receive Address (RADR[4:0]). The

RADR[4:1] signal is used to select the

FIFO (and hence port) that is read from

using the RENB signal and the FIFO

whose cell-available signal is visible on the

RCA output. RADR[4:0] is sampled on the

rising edge of RFCLK together with RENB.

Note that the null-PHY address 1FH is an

invalid address and will not be identified to

any port on the S/UNI-QJET.

RCA

Output

N19

Receive Multi-Phy Cell Available (RCA).

The RCA signal indicates when a cell is

available in the receive FIFO for the port

selected by RADR[4:0]. 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 byte 48 (RCALEVEL0=1) or

43 (RCALEVEL0=0) is output for the 8-bit

interface (ATM8=1), or after Payload word

24 (RCALEVEL0=1) or 19

(RCALEVEL0=0) is output for the 16-bit

interface (ATM8=0) if the PHY being polled

is the same as the PHY in use.

RCA is tri-stated when either the null-PHY

address (1FH) or an address not matching

the address space set by PHY_ADR[2:0]

is latched (by RFCLK) from the RADR[4:2]

inputs.

The polarity of RCA (with respect to the

description above) is inverted when the

RCAINV register bit is set to logic 1.

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