PM4328 datasheet(79/250 Pages) PMC

79 / 250 page

STANDARD PRODUCT

PM4328 TECT3

DATASHEET

PMC-2011596

ISSUE 1

HIGH DENSITY T1/E1 FRAMER

AND M13 MULTIPLEXER

PROPRIETARY AND CONFIDENTIAL

signaling H-MVIP. These elastic stores are identical to the elastic store described

in section 9.7.

When simultaneous SBI with CAS or CCS H-MVIP is selected by the

SYSOPT[2:0] bits in the Global Configuration register these elastic stores

eliminate the need for the H-MVIP interface clock and frame alignment to be

externally synchronized to the rate and frame alignment of the individual links

carries over the SBI interface. Any rate differences between the H-MVIP

interface and an individual link will result in a controlled slip in the CAS or CCS

data relative to the data channels of the individual T1 links.

When simultaneous serial clock and data with CCS H-MVIP is selected these

elastic stores eliminate the need for the H-MVIP interface clock and frame

alignment to be externally synchronized to the rate and frame alignment of the

individual serial streams. As with simultaneous SBI mode, any rate differences

between the H-MVIP interface and an individual link will result in a controlled slip

in the CCS signaling relative to the data channels of the individual T1 links.

9.9 Signaling Extractor (SIGX)

The Signaling Extraction (SIGX) block provides channel associated signaling

(CAS) extraction from an E1 signaling multi-frame or from ESF, and SF T1

formats.

In T1 mode, the SIGX block provides signaling bit extraction from the received

data stream for ESF and SF framing formats. It selectively debounces the bits,

and serializes the results onto the ISIG[x] outputs or CAS bits within the SBI Bus

structure. Debouncing is performed on individual signaling bits. This ISIG[x]

output is channel aligned with ID[x] output, and the signaling bits are repeated for

the entire superframe, allowing downstream logic to reinsert signaling into any

frame, as determined by system timing. The signaling data stream contains the

A,B,C,D bits in the lower 4 channel bit locations (bits 5, 6, 7 and 8) in ESF

framing format; in SF format the A and B bits are repeated in locations C and D

(i.e. the signaling stream contains the bits ABAB for each channel).

The SIGX block contains three superframes worth of signal buffering to ensure

that there is a greater than 95% probability that the signaling bits are frozen in

the correct state for a 50% ones density out-of-frame condition, as specified in

TR-TSY-000170 and BELL PUB 43801. With signaling debounce enabled, the

per-channel signaling state must be in the same state for 2 superframes before

appearing on the serial output stream.

The SIGX block provides one superframe or signaling-multiframe of signal

freezing on the occurrence of slips. When a slip event occurs, the SIGX freezes

PM4328 Datasheet(PDF) 79 Page - PMC-Sierra, Inc

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