PM5366-PI datasheet(94/267 Pages) PMC

94 / 267 page

PRELIMINARY

PM5366 TEMAP-84

DATASHEET

PMC-2010672

ISSUE 1

HIGH DENSITY 84/63 CHANNEL VT/TU MAPPER

AND M13 MULTIPLEXER

PROPRIETARY AND CONFIDENTIAL

containing code values different from the detected code are received in a moving

window of ten code periods.

Valid BOC are indicated through the RBOC Interrupt Status register. The BOC

bits are set to all ones (111111) if no valid code has been detected. An interrupt

is generated to signal when a detected code has been validated, or optionally,

when a valid code goes away (i.e. the BOC bits go to all ones).

9.11 DS3/E3 HDLC Receiver (RDLC)

The RDLC is a microprocessor peripheral used to receive HDLC frames on the

DS3 C-bit parity Path Maintenance Data Link, E3 G.832 Network Operator byte,

E3 G.832 General Purpose Communications Channel or E3 G.751 National Use

bit.

The RDLC detects the change from flag characters to the first byte of data,

removes stuffed zeros on the incoming data stream, receives packet data, and

calculates the CRC-CCITT frame check sequence (FCS).

In the address matching mode, only those packets whose first data byte matches

one of two programmable bytes or the universal address (all ones) are stored in

the FIFO. The two least significant bits of the address comparison can be

masked for LAPD SAPI matching.

Received data is placed into a 128-byte FIFO buffer. An interrupt is generated

when a programmable number of bytes are stored in the FIFO buffer. Other

sources of interrupt are detection of the terminating flag sequence, abort

sequence, or FIFO buffer overrun.

The Status Register contains bits which indicate the overrun or empty FIFO

status, the interrupt status, and the occurrence of first flag or end of message

bytes written into the FIFO. The Status Register also indicates the abort, flag,

and end of message status of the data just read from the FIFO. On end of

message, the Status Register indicates the FCS status and if the packet

contained a non-integer number of bytes.

9.12 DS3/E3 Performance Monitor Accumulator (DS3/E3-PMON)

The Performance Monitor (PMON) Block interfaces directly with the DS3 Framer

(DS3-FRMR) and E3 Framer. Saturating counters are used to accumulate:

• line code violation (LCV) events

• parity error (PERR) events

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