PMC-Sierra, Inc.
PM5356
S/UNI-622-MAX
DATASHEET
S/UNI-622-MAX
PMC-1980589
ISSUE 5
SATURN USER NETWORK INTERFACE (622-MAX)
9
PIN DESCRIPTION
9.1
Serial Line Side Interface Signals
Pin Name
Type
Pin
No.
Function
RBYP
Input
E21
The receive bypass (RBYP) input disables clock recovery. If
RBYP is high, RXD+/- is sampled on the rising edge of
RRCLK+/-. If RBYP is low, the receive clock is recovered from
the RXD+/- bit stream.
Please refer to the Operation section for a discussion of the
operating modes.
PECLV
Input
D22
The PECL signal voltage select (PELCV) selects between 3.3V
PECL signaling and 5V PECL signaling for the PECL inputs.
When PECLV is low, the PECL inputs expect a 5V PECL signal.
When PECLV is high, the PECL inputs expect a 3.3V PECL
signal. The PECL biasing pins PBIAS should be set to the
appropriate voltage to prevent latchup.
Please refer to the Operation section for a discussion of PECL
interfacing issues.
REFCLK+
REFCLK-
Differential Y2
PECL Input AA1
The differential reference clock inputs (REFCLK+/-) provides a
jitter-free 77.76 MHz reference clock for both the clock recovery
and the clock synthesis circuits. REFCLK+/- is not required if
the clock recovery and clock synthesis features are not used.
Please refer to the Operation section for a discussion of PECL
interfacing issues and reference clocks.
RXD+
RXD-
Differential W1
PECL Input V2
The receive differential data PECL inputs (RXD+/-) contain the
NRZ bit serial receive stream. The receive clock is recovered
from the RXD+/- bit stream when RBYP is set low. RXD+/- is
sampled on the rising edge of RRCLK+/- when RBYP is set
high.
Please refer to the Operation section for a discussion of PECL
interfacing issues.
RRCLK+
RRCLK-
Differential U1
PECL Input U2
When clock recovery is bypassed (RBYP set high), RRCLK+/- is
nominally a 622.08 MHz 50% duty cycle clock and provides
timing for the S/UNI-622-MAX receive functions. In this case,
RXD+/- is sampled on the rising edge of RRCLK+/-. RRCLK+/-
is ignored when RBYP is set low.
Please refer to the Operation section for a discussion of PECL
interfacing issues.
PROPRIETARY AND CONFIDENTIAL TO PMC-SIERRA INC., AND FOR ITS CUSTOMERS’ INTERNAL USE
16
PMC [ PMC-SIERRA, INC ]
