PM7347 datasheet(82/341 Pages) PMC

82 / 341 page

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

8KREFO

Bit 6

R/W

DS27_53

Bit 5

R/W

TOCTA

Bit 4

R/W

FRMRONLY

Bit 3

R/W

LOOPT

Bit 2

R/W

LLOOP

Bit 1

R/W

DLOOP

Bit 0

R/W

PLOOP

The PLOOP bit controls the DS3, E3, or J2 payload loopback. When a logic zero is written to

PLOOP, DS3, E3, or J2 payload loopback is disabled. When a logic one is written to PLOOP,

the DS3, E3, or J2 overhead bits are regenerated and inserted into the received DS3, E3, or J2

stream and the resulting stream is transmitted. Setting the PLOOP bit disables the effect of

the TICLK bit in the S/UNI-JET Transmit Configuration Register, thereby forcing flow-

through timing. The TFRM[1:0] and RFRM[1:0] bits in the S/UNI-JET Transmit

Configuration and Receive Configuration Registers, respectively, must be set to the same

value for PLOOP to work properly.

DLOOP

The DLOOP bit controls the diagnostic loopback. When a logic zero is written to DLOOP,

diagnostic loopback is disabled. When a logic one is written to DLOOP, the transmit data

stream is looped in the receive direction. The TFRM[1:0] and RFRM[1:0] bits in the S/UNI-

JET Transmit Configuration and Receive Configuration Registers, respectively, must be set to

the same value for DLOOP to work properly. The DLOOP should not be set to a logic one

when either the PLOOP, LLOOP, or LOOPT bit is a logic one. When in DS3, E3, or J2

modes, the TUNI register bit in the S/UNI-JET Transmit Configuration Register should be set

to the same value as the UNI bit in the DS3, E3, or J2 FRMR Registers.

LLOOP

The LLOOP bit controls the line loopback. When a logic zero is written to LLOOP, line

loopback is disabled. When a logic one is written to LLOOP, the stream received on

RPOS/RDATI and RNEG/RLCV/ROHM is looped to the TPOS/TDATO and TNEG/TOHM

outputs. Note: The TPOS, TNEG, and TCLK outputs are referenced to RCLK when LLOOP

is logic one.

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