78P2351R 155Mbps NRZ to CMI Converter
REGISTER DESCRIPTION (continued)
ADDRESS 1-1: SIGNAL CONTROL REGISTER
DFLT
BIT
NAME
TYPE
DESCRIPTION
VALUE
Transmit CMI Inversion:
This bit will flip the polarity of the transmit CMI data outputs at CMIP/N.
7
TCMIINV
R/W
0
0: Normal
1: Invert
Receive CMI Inversion:
This bit will flip the polarity of the receive CMI data inputs at RXP/N.
6
5
RCMIINV
LOSOR
R/W
R/W
0
0
0: Normal
1: Invert
Receive Loss of Signal Override/Disable:
When set, the LOS signal will always remain low.
0: Normal
1: Forces LOS output to be low and resets counter
Loopback Selection:
RLBK LLBK
4
3
RLBK
LLBK
R/W
R/W
0
0
0
1
0
0
Normal operation
Remote Loopback Enable: Recovered receive data
is looped back to the transmitter for retransmission.
Local Loopback Enable: The transmit data is
looped back and used as the input to the receiver.
0
1
2:1
0
--
R/W
R/W
00
0
Reserved.
FIFO Reset:
FRST
0: Normal operation
1: Reset FIFO pointers to default locations.
ADDRESS 1-2: ADVANCED TRANSMIT CONTROL REGISTER 1
DFLT
BIT
NAME
TYPE
DESCRIPTION
VALUE
000000 Reserved.
Transmit Driver Peaking Enable:
7:2
--
R/W
When high, adds a 2% peak to the beginning of a transition in the CMI
line driver to compensate for low inductive backplanes.
1
0
TPK
R/W
R/W
0
0: Normal Operation
1: Add peaking
Transmit Fixed Equalizer Enable:
When enabled, compensates for between 0.75m and 1.5m of FR4 trace
to the serial LVPECL data inputs SIDP/N
TXEQ
0
0: Normal Operation
1: Enable equalizer
10
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