PM7347 datasheet(47/341 Pages) PMC

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S/UNI®-JET Data Sheet

Released

Proprietary and Confidential to PMC-Sierra, Inc., and for its Customers’ Internal Use

Document ID: PMC-1990267, Issue 3

Pin Name

Type

No.

Function

RPRTY

Output

R18

The Receive Parity (RPRTY) signal indicates the parity

of the RDAT bus.

The S/UNI-JET can be configured to operate with an 8-

bit wide or 16-bit wide ATM data interface via the ATM8

input pin. In the 8-bit mode, RPRTY reflects the parity of

RDAT[7:0]. In the 16-bit mode, RPRTY reflects the parity

of RDAT[15:0].

Odd or even parity selection is made using the RXPTYP

RPRTY is tri-stated when either the null-PHY address

(7H) or an address not matching the address space set

by PHY_ADR[2:0] is latched from the RADR[2:0] inputs

when RENB is high.

RSOC

Output

M17

The Receive Start of Cell (RSOC) 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

(7H) or an address not matching the address space set

by PHY_ADR[2:0] is latched from the RADR[2:0] inputs

when RENB is high.

RENB

Input

N18

The Receive Multi-PHY Read Enable (RENB) signal is

used to initiate reads from the receive FIFO.

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[2:0] 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[2:0] 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.

RADR[2]

RADR[1]

RADR[0]

Input

P19

N17

P18

The Receive Address (RADR[2:0])] bus is used for

device selection and device polling in accordance with

the Utopia Level 2 standard. When RADR[2:0] is set to

the same value as the PHY_ADR[2:0] inputs than the

receive interface of this S/UNI-JET is either being

selected or polled.

Note: The null PHY address 7H is an invalid address and

cannot be used to select the S/UNI-JET.

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

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