PM7346 S/UNI-QJET
DATASHEET
PMC-960835
ISSUE 6
SATURN QUAD USER NETWORK INTERFACE FOR J2, E3, T3
Pin Name
Type
Input
Pin No. Function
ROHM[4]
ROHM[3]
ROHM[2]
ROHM[1]
C5
E3
E1
G2
Receive Overhead Mask (ROHM[4:1]).
When a DS1 or E1 PLCP or ATM direct-
mapped signal is received, ROHM[4:1] is
pulsed once per transmission frame, and
indicates the DS1 or E1 frame alignment
relative to the RDATI[4:1] data stream.
When an alternate frame-based signal is
received, ROHM[4:1] indicates the position
of each overhead bit in the transmission
frame.
The RNEG/RLCV/ROHM[4:1] pin function
selection is controlled by the RFRM[1:0]
bits in the S/UNI-QJET Receive
Configuration Registers, the UNI bits in the
DS3 FRMR, E3 FRMR, or J2 FRMR
Configuration Registers, and the PLCPEN
and EXT bits in the SPLR Configuration
register. RNEG[4:1], RLCV[4:1], and
ROHM[4:1] are sampled on the rising
edge of RCLK[4:1] by default, and may be
enabled to be sampled on the falling edge
of RCLK[4:1]. This sampling is controlled
by the RCLKINV bit in the S/UNI-QJET
Receive Configuration Registers. In
addition, signal polarity control is provided
by the RNEGINV bit in the S/UNI-QJET
Receive Configuration Registers.
RCLK[4]
RCLK[3]
RCLK[2]
RCLK[1]
Input
A4
F4
F3
G1
Receive Clock (RCLK[4:1]). RCLK[4:1]
provides the receive direction timing.
RCLK[4:1] is the externally recovered
transmission system baud rate clock that
samples the RPOS/RDATI[4:1] and
RNEG/RLCV/ROHM[4:1] inputs on its
rising or falling edge.
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PMC [ PMC-SIERRA, INC ]
