PM7344 datasheet(242/293 Pages) PMC

242 / 293 page

PM7344 S/UNI-MPH

DATA SHEET

PMC-950449

ISSUE 6

MULTI-PHY USER NETWORK INTERFACE

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

226

The S/UNI-MPH is configured to select the arbitrary receive interface. ROHI

marks the location of the transmission system overhead bits (TSOH) in the RDD

stream. The active polarity (here shown as active high) of the ROHI signal can

be inverted using the RDNINV bit in the Receive Interface Configuration register.

The active edge that is used to sample RDD and ROHI (here shown as the rising

edge) can be inverted using the RFALL bit in the Receive Interface Configuration

Figure 20

- J2 (6.312 Mbit/s) Transmit Interface

S/UNI-MPH

Outputs

"frame gen

bit count"

TCG

TTS

TCOUT

JT2F

Outputs

TDD[x]

TOHO[x]

TCLKO{x]

The S/UNI-MPH is configured to select the J2 transmit interface. The

connections between the S/UNI-MPH and the JT2F J2 framer should be made

as shown in the "OPERATIONS - Using the JT2F" section. The register bits

TFALL, TOHINV, TRISE, and TDNINV are all set to logic 1 so that TOHI is

sampled on the falling TCLKI edge, TOHI is active low, TDD[x] and TOHO[x] are

updated on the rising edge of TCLKO[x], and TOHO[x] is active low. TOHO[x]

goes low during the first frame alignment bit position in the transmitted data once

every J2 multiframe. The falling edge of TOHO[x] occurs approximately 1 clock

period after TTS gets sampled high (starting at the falling edge of TCOUT where

TTS is sampled high by the S/UNI-MPH and ending at the rising edge of

TCLKO[x] where TOHO[x] is generated). Note that with this configuration,

TCLKO[x] is a flow-through and inverted version of TCOUT whose phase delay

from TCOUT will be less than half a TCOUT period.

PM7344 Datasheet(PDF) 242 Page - PMC-Sierra, Inc