PM7375-SC datasheet(32/430 Pages) PMC

32 / 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

TCP/

TLDCLK

Output

112

The TGFC/TLDCLK 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 transmit cell pulse

(TCP) indicates where the valid TGFC serial bits are

expected. If TCP is asserted high, the most significant

GFC bit is expected in the subsequent TCLK period.

TCP pulses high for one TCLK for every transmitted

cell. TCP is updated on the rising edge of TCLK.

When the UNI_POTS bit is high, the transmit line DCC

clock (TLDCLK) is a 576 kHz clock used to sample the

TLD input. TLDCLK is generated by gapping a

2.16 MHz clock.

XOFF

Input

114

The transmit off (XOFF) signal can be used to control

the transmission of user cells. When XOFF is asserted

high, the LASAR-155 is prohibited from transmitting

user cells. Under this operating condition, the

LASAR-155 can only transmit Idle/Unassigned cells.

When XOFF is low, the LASAR-155 operates normally.

XOFF is sampled on the rising edge of TCLK.

PM7375-SC Datasheet(PDF) 32 Page - PMC-Sierra, Inc