S/UNI®-JET Data Sheet
Released
Register 302H: S/UNI-JET Transmit Configuration
Bit
Type
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
Function
TFRM[1]
TFRM[0]
TXREF
TICLK
TUNI
TCLKINV
TPOSINV
TNEGINV
Default
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
0
0
0
0
0
0
0
0
TNEGINV
The TNEGINV bit provides polarity control for outputs TNEG/TOHM. When a logic zero is
written to TNEGINV, the TNEG/TOHM output is not inverted. When a logic one is written to
TNEGINV, the TNEG/TOHM output is inverted. The TNEGINV bit setting does not affect
the loopback data in diagnostic loopback.
TPOSINV
The TPOSINV bit provides polarity control for outputs TPOS/TDATO. When a logic zero is
written to TPOSINV, the TPOS/TDATO output is not inverted. When a logic one is written to
TPOSINV, the TPOS/TDATO output is inverted. The TPOSINV bit setting does not affect the
loopback data in diagnostic loopback.
TCLKINV
The TCLKINV bit provides polarity control for output TCLK. When a logic zero is written to
TCLKINV, TCLK is not inverted and outputs TPOS/TDATO and TNEG/TOHM are updated
on the falling edge of TCLK. When a logic one is written to TCLKINV, TCLK is inverted
and outputs TPOS/TDATO and TNEG/TOHM are updated on the rising edge of TCLK.
TUNI
The TUNI bit enables the S/UNI-JET to transmit unipolar or bipolar DS3, E3, or J2 data
streams. When a logic one is written to TUNI, the S/UNI-JET transmits unipolar DS3, E3, or
J2 data on TDATO. When TUNI is logic one, the TOHM output indicates the start of the DS3
M-Frame (the X1 bit), the start of the E3 frame (bit 1 of the frame), or the first framing bit of
the J2 multiframe. When a logic zero is written to TUNI, the S/UNI-JET transmits B3ZS-
encoded DS3 data, HDB3-encoded E3 data, or B8ZS-encoded J2 data on TPOS and TNEG.
The TUNI bit has no effect if TFRM[1:0] is set to 11 binary as the output data is
automatically configured for unipolar format.
Proprietary and Confidential to PMC-Sierra, Inc., and for its Customers’ Internal Use
Document ID: PMC-1990267, Issue 3
87
PMC [ PMC-SIERRA, INC ]
