PM5347 datasheet(74/302 Pages) PMC

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PM5347 S/UNI-PLUS

DATA SHEET

PMC-941033

ISSUE 6

SATURN USER NETWORK INTERFACE PLUS

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

interrupt and register bit. The FIFO interface provided to the system is a

synchronous interface emulating commercial synchronous FIFOs. All receive

FIFO signals, RSOC, RRDENB, RCA, RXPRTY[1:0] and RDAT[15:0] are either

sampled or updated on the rising edge of the RFCLK clock input.

9.9

Clock Synthesis

The transmit clock may be synthesized from a 19.44 MHz or 6.48 MHz reference.

The transfer function yields a typical low pass corner of 500 kHz with a 19.44

MHz reference and 170 kHz with a 6.48 MHz reference, above which reference

jitter is attenuated at 12dB per octave. The design of the loop filter and PLL is

optimized for minimum intrinsic jitter. With a jitter free 19.44 MHz reference, the

intrinsic jitter is typically less than 0.01 UI RMS when measured using a high

pass filter with a 12 kHz cutoff frequency.

The TRCLK+/- reference should be within ±20 ppm to meet the SONET free-run

accuracy requirements specified in GR-253-CORE.

9.10

Parallel to Serial Converter

The Parallel to Serial Converter (PISO) converts the transmit byte serial stream

to a bit serial stream.

9.11

Transmit Section Overhead Processor

The Transmit Section Overhead Processor (TSOP) provides frame pattern

insertion (A1, A2), scrambling, section level alarm signal insertion, and section

BIP-8 (B1) insertion.

Line AIS Insert

Line AIS insertion results in all bits of the SONET/SDH frame being set to 1

before scrambling except for the section overhead. The Line AIS Insert Block

substitutes all ones as described when enabled by the TLAIS input or through an

internal register accessed through the microprocessor interface. Activation or

deactivation of line AIS insertion is synchronized to frame boundaries.

BIP-8 Insert

The BIP-8 Insert Block calculates and inserts the BIP-8 error detection code (B1)

into the transmit stream.

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