PM5381-BI PMC-Sierra, Inc., PM5381-BI Datasheet - Page 53
PM5381-BI
Manufacturer Part Number
PM5381-BI
Description
ATM UNI, Single Channel ATM PHY Interface for 2488.32Mbps
Manufacturer
PMC-Sierra, Inc.
Datasheet
1.PM5381-BI.pdf
(586 pages)
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Proprietary and Confidential to PMC-Sierra, Inc., and for its Customers’ Internal Use
Document ID: PMC-2000489, Issue 4
Clocks and Alarms (7)
Pin Name
PGMRCLK
RCLK
PGMTCLK
TCLK
Type
Output
Output
Output
Output
Pin
No.
AK25
AG23
AH23
AJ24
Function
The programmable receive clock (PGMRCLK) signal
provides timing reference for the receive line interface.
PGMRCLK is a divided version of the recovered clock. When
the PGMRCLKSEL register bit is set low, PGMRCLK is a
nominal 19.44 MHz, 50% duty cycle clock. When the
PGMRCLKSEL register bit is set high, PGMRCLK is a
nominal 8 KHz, 50% duty cycle clock.
The PGMRCLK output can be disabled and held low by
programming the PGMRCLKEN bit in the SRLI PGM Clock
Configuration register.
The receive clock (RCLK) signal provides timing reference
for the receive interface. This pin is driven by a digital pad and
is not intended to be used as a clock source. An external PLL
is required to smooth this clock if it is desired to be used as a
clock source. Jitter on this clock is typically about 450ps.
RCLK is a nominal 77.76 MHz 50% duty cycle clock. The
RCLK output can be disabled and held low by programming
the RCLKEN bit in the SRLI Clock Configuration register.
OOF and SALM are updated on the rising edge of RCLK.
The programmable transmit clock (PGMTCLK) signal
provides timing reference for the transmit line interface.
PGMTCLK is a divided version of the reference clock. When
the PGMTCLKSEL register bit is set low, PGMTCLK is a
nominal 19.44 MHz, 50% duty cycle clock. When the
PGMTCLKSEL register bit is set high, PGMTCLK is a nominal
8 KHz, 50% duty cycle clock.
The PGMTCLK output can be disabled and held low by
programming the PGMTCLKEN bit in the STLI PGM Clock
Configuration register.
The transmit clock (TCLK) signal provides timing reference
for the transmit interface. This pin is driven by a digital pad
and is not intended to be used as a clock source. An external
PLL is required to smooth this clock if it is desired to be used
as a clock source.
Jitter on this clock is typically about 450ps.
TCLK is a nominal 77.76MHz 50% duty cycle clock. The
TCLK output can be disabled and held low by programming
the TCLKEN bit in the STLI Clock Configuration register.
S/UNI-2488 Telecom Standard Product Datasheet
Released
53
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