PM5352 datasheet(35/77 Pages) PMC

35 / 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

RVAL

Output

(POS)

M22

POS-PHY Receive Data Valid (RVAL).

RVAL indicates the validity of the receive data

signals. When RVAL is high, the Receive signals

(RDAT, RSOP, REOP, RMOD, RPRTY and RERR)

are valid. When RVAL is low, all Receive signals are

invalid and must be disregarded. RVAL will

transition low on a FIFO empty condition or on an

end of packet. . No data will be removed from the

receive FIFO while RVAL is deasserted. Once

deasserted, RVAL will remain deasserted until the

current PHY is deselected.

RVAL allows to monitor the selected PHY during a

data transfer, while monitoring other PHY’s is done

using DRPA.

RVAL is tristated when RENB is deasserted. RVAL

is also tristated when either the null-PHY address

(0x7H) or an address not matching the PHY layer

device address is presented on the RADR[2:0]

signals.

RVAL is updated on the rising edge of RFCLK.

RFCLK

Input

(ATM)

P21

UTOPIA Receive FIFO Read Clock (RFCLK).

RFCLK is used to read ATM cells from the receive

FIFO’s. RFCLK must cycle at a 50 MHz or lower

instantaneous rate, but at a high enough rate to

avoid FIFO overflows.

RFCLK

Input

(ATM)

P21

POS-PHY Receive FIFO Read Clock (RFCLK).

This signal is used to read packets from the receive

FIFO’s. RFCLK must cycle at a 50 MHz or lower

instantaneous rate, but at a high enough rate to

avoid FIFO overflows.

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