PM7346 datasheet(68/419 Pages) PMC

68 / 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 47

Pin Name

Type

Pin No.

Function

RSOC

Output

M17

Receive Start of Cell (RSOC). This signal

marks the start of cell on the RDAT bus.

RSOC marks the start of the cell on the

RDAT bus.

RSOC 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 from the

RADR[4:0] inputs when RENB is high.

RENB

Input

N18

Receive Multi-Phy Read Enable (RENB).

The RENB signal is used to initiate reads

from the receive FIFOs. When sampled

low using the rising edge of RFCLK, a byte

is read (if one is available) from the receive

FIFO selected by the RADR[4:0] address

bus and output on the RDAT bus. When

sampled high using the rising edge of

RFCLK, no read is performed and

RDAT[15:0], RPRTY, and RSOC are tri-

stated, and the address on RADR[4:0] is

latched to select the device or port for the

next ATM FIFO access. RENB must

operate in conjunction with RFCLK to

access the FIFOs at a high enough rate to

prevent FIFO overflows. The ATM layer

device may de-assert RENB at anytime it

is unable to accept another byte.

PM7346 Datasheet(PDF) 68 Page - PMC-Sierra, Inc

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