PM7346 S/UNI-QJET
DATASHEET
PMC-960835
ISSUE 6
SATURN QUAD USER NETWORK INTERFACE FOR J2, E3, T3
Pin Name
Type
Pin No. Function
TOHM[4]
TOHM[3]
TOHM[2]
TOHM[1]
Output A5
Transmit Overhead Mask (TOHM[4:1]).
TOHM[4:1] indicates the position of
overhead bits (non-payload bits) in the
transmission system stream aligned with
TDATO[4:1]. TOHM[4:1] indicates the
location of the M-frame boundary for DS3,
the position of the frame boundary for E3,
and the position of the multi-frame
D5
E4
F1
boundary for J2 when the single-rail
(unipolar) NRZ input format is enabled.
When a PLCP formatted signal is
transmitted, TOHM[4:1] is set to logic 1
once per transmission frame, and
indicates the DS1 or E1 frame alignment.
When a non-PLCP, non-DS3, non-E3, non-
J2 based signal is transmitted, TOHM[4:1]
is a delayed version of the TIOHM[4:1]
input, and indicates the position of each
overhead bit in the transmission frame.
TOHM[4:1] is updated on the falling edge
of TCLK[4:1].
The TNEG/TOHM[4:1] pin function
selection is controlled by the TFRM[1:0]
and the TUNI bits in the S/UNI-QJET
Transmit Configuration Registers. Output
signal polarity control is provided by the
TNEGINV bit in the S/UNI-QJET Transmit
Configuration Registers. Both TNEG[4:1]
and TOHM[4:1] are updated on the falling
edge of TCLK[4:1] by default, and may be
enabled to be updated on the rising edge
of TCLK[4:1]. This sampling is controlled
by the TCLKINV bit in the S/UNI-QJET
Transmit Configuration Registers. Finally,
both TNEG[4:1] and TOHM[4:1] can be
updated on the rising edge of TICLK[4:1],
enabled by the TICLK bit in the
S/UNI-QJET Transmit Configuration
Registers.
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