PM7375-SC datasheet(30/430 Pages) PMC

30 / 430 page

PM7375 LASAR-155

DATA SHEET

PMC-931127

ISSUE 6

LOCAL ATM SAR & PHYSICAL LAYER

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

TXD+

TXD-

Output

126

127

The transmit differential data outputs (TXD+, TXD-)

contain the 155.52 Mbit/s transmit STS-3c (STM-1)

stream or the 51.84 Mbit/s transmit STS-1 stream.

When the STS-1 stream is selected, TXD+/- are

updated on the falling edge of TXC. TXD+/- is NRZ

encoded.

TCLK

Output

155

The transmit byte clock (TCLK) is either a 19.44 MHz

or a 6.48 MHz clock derived from the transmit line

rate.

TFPO

Output

158

The active high framing position output (TFPO) signal

is an 8 kHz timing marker for the transmitter. TFPO

goes high for a single TCLK period once every 2430 in

STS-3c (STM-1) mode or 810 in STS-1 mode TCLK

cycles. TFPO is updated on the rising edge of TCLK.

RGFC/RLD Output

111

The RGFC/RLD output is a dual function output

controlled using the UNI_POTS bit in the LASAR-155

Master Configuration register.

When the UNI_POTS bit is low, the receive generic

flow control (RGFC) output presents the extracted GFC

bits in a serial stream. The four GFC bits are

presented for each received cell, with the RCP output

indicating the position of the most significant bit. The

updating of RGFC by particular GFC bits may be

disabled through the RACP Configuration register. The

serial link is forced low if cell delineation is lost. RGFC

is updated on the rising edge of RCLK.

When the UNI_POTS bit is high, the receive line DCC

(RLD) signal contains the serial line data

communications channel (D4 - D12) extracted from the

incoming stream. RLD is updated on the falling edge

of RLDCLK.

PM7375-SC Datasheet(PDF) 30 Page - PMC-Sierra, Inc

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