PM7347 datasheet(87/341 Pages) PMC

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S/UNI®-JET Data Sheet

Released

Proprietary and Confidential to PMC-Sierra, Inc., and for its Customers’ Internal Use

Document ID: PMC-1990267, Issue 3

Bit

Type

Function

Default

Bit 7

R/W

TFRM[1]

Bit 6

R/W

TFRM[0]

Bit 5

R/W

TXREF

Bit 4

R/W

TICLK

Bit 3

R/W

TUNI

Bit 2

R/W

TCLKINV

Bit 1

R/W

TPOSINV

Bit 0

R/W

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.

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