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
REF8KI
T3
Reference 8 kHz Input (REF8KI). The
PLCP frame rate is locked to an external 8
kHz reference applied on this input . An
internal phase-frequency detector
compares the transmit PLCP frame rate
with the externally applied 8 kHz reference
and adjusts the PLCP frame rate.
The REF8KI input must transition high
once every 125 µs for correct operation.
The REF8KI input is treated as an
asynchronous signal and must be “glitch-
free”. If the LOOPT register bit is logic 1,
the PLCP frame rate is locked to the
RPOHFP[x] signal instead of the REF8KI
input.
TPOHINS[4]
TPOHINS[3]
TPOHINS[2]
TPOHINS[1]
Input
V14
W11
U9
Transmit Path Overhead Insertion
(TPOHINS[4:1]). TPOHINS[4:1] controls
the insertion of PLCP overhead octets on
the TPOH[4:1] input. When TPOHINS[4:1]
is logic 1, the associated overhead bit in
the TPOH[4:1] stream is inserted in the
transmit PLCP frame. When
W5
TPOHINS[4:1] is logic 0, the PLCP path
overhead bit is generated and inserted
internally. TPOHINS[4:1] is sampled on
the rising edge of TPOHCLK[4:1].
Note, when operating in G.751 E3 PLCP
mode, bits 8, 7 and 6 of the C1 octet
should not be manipulated.
PMC-SIERRA, INC. PROPRIETARY AND CONFIDENTIAL TO PMC-SIERRA INC., AND ITS CUSTOMERS’ INTERNAL USE 29
PMC [ PMC-SIERRA, INC ]
