S/UNI®-JET Data Sheet
Released
9
Pin Description
Pin Name
Type
Pin
No.
Function
TPOS
Output
C6
The Transmit Digital Positive Pulse (TPOS) contains the
positive pulses transmitted on the B3ZS-encoded DS3,
HDB3-encoded E3, or B8ZS-encoded J2 transmission
system when the dual-rail output format is selected.
The Transmit Data (TDATO) contains the transmit data
stream when the single-rail (unipolar) output format is
enabled or when a non-DS3/E3/J2 based transmission
system is selected.
TDATO
The TPOS/TDATO pin function selection is controlled by
the TFRM[1:0] and the TUNI bits in the S/UNI-JET
Transmit Configuration Register. Output signal polarity
control is provided by the TPOSINV bit in the S/UNI-JET
Transmit Configuration Register.
Both TPOS and TDATO are updated on the falling edge
of TCLK by default, and may be configured for update on
the rising edge of TCLK through the TCLKINV bit in the
S/UNI-JET Transmit Configuration Register. Also, both
TPOS and TDATO can be updated on the rising edge of
TICLK, enabled by the TICLK bit in the S/UNI-JET
Transmit Configuration Register.
TNEG
TOHM
Output
A5
The Transmit Digital Negative Pulse (TNEG) contains the
negative pulses transmitted on the B3ZS-encoded DS3,
HDB3-encoded E3, or B8ZS-encoded J2 transmission
system when the dual-rail NRZ output format is selected.
The Transmit Overhead Mask (TOHM) indicates the
position of overhead bits (non-payload bits) in the
transmission system stream aligned with TDATO. TOHM
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 boundary for J2 when the
single-rail (unipolar) NRZ input format is enabled.
When a PLCP formatted signal is transmitted, TOHM is
set to logic one once per transmission frame, and
indicates the DS1 or E1 frame alignment.
When a non-PLCP, non-DS3, non-E3, or non-J2 based
signal is transmitted, TOHM is a delayed version of the
TIOHM input, and indicates the position of each
overhead bit in the transmission frame. TOHM is updated
on the falling edge of TCLK.
The TNEG/TOHM pin function selection is controlled by
the TFRM[1:0] and the TUNI bits in the S/UNI-JET
Transmit Configuration Register. Output signal polarity
control is provided by the TNEGINV bit in the S/UNI-JET
Transmit Configuration Register.
Proprietary and Confidential to PMC-Sierra, Inc., and for its Customers’ Internal Use
Document ID: PMC-1990267, Issue 3
34
PMC [ PMC-SIERRA, INC ]
