
PM7346 S/UNI-QJET
DATASHEET
PMC-960835
ISSUE 6
SATURN QUAD USER NETWORK INTERFACE FOR J2, E3, T3
PMC-SIERRA, INC. PROPRIETARY AND CONFIDENTIAL TO PMC-SIERRA INC., AND ITS CUSTOMERS’ INTERNAL USE
89
Register 000H, 100H, 200H, 300H: S/UNI-QJET Configuration 1
Bit
Type
Function
Default
Bit 7
R/W
8KREFO
1
Bit 6
R/W
DS27_53
1
Bit 5
R/W
TOCTA
0
Bit 4
R/W
FRMRONLY
0
Bit 3
R/W
LOOPT
0
Bit 2
R/W
LLOOP
0
Bit 1
R/W
DLOOP
0
Bit 0
R/W
PLOOP
0
PLOOP:
The PLOOP bit controls the DS3, E3, or J2 payload loopback. When a logic 0
is written to PLOOP DS3, E3, or J2 payload loopback is disabled. When a
logic 1 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-QJET Transmit Configuration register, thereby forcing flow-through
timing. The TFRM[1:0] and RFRM[1:0] bits in the S/UNI-QJET 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 0 is written to
DLOOP diagnostic loopback is disabled. When a logic 1 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-QJET 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 1 when
either the PLOOP LLOOP or LOOPT bit is a logic 1. When in DS3, E3, or J2
modes, the TUNI register bit in the S/UNI-QJET Transmit Configuration
register should be set to the same value as the UNI bit in the DS3, E3, or J2
FRMR registers.