Datasheet

DS1878
SFP+ Controller with Digital LDD Interface
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Table 02h, Register 8Bh: CNFGC
FACTORY DEFAULT 00h
READ ACCESS PW2 or (PW1 and RWTBL246) or (PW1 and RTBL246)
WRITE ACCESS PW2 or (PW1 and RWTBL246)
MEMORY TYPE Nonvolatile (SEE)
8Bh XOVEREN INVMON2 TXDM34 TXDFG TXDFLT TXDIO RSSI_FC RSSI_FF
BIT 7 BIT 0
BIT 7
XOVEREN: Enables RSSI conversion to use the XOVER (Table 02h, Register 90h–91h) value during
MON3 conversions.
0 = Uses hysteresis for linear RSSI measurements.
1 = XOVER value is enabled for nonlinear RSSI measurements.
BIT 6
INVMON2:
0 = MON2 is referenced to GND.
1 = MON2 is referenced to V
CC
.
BIT 5
TXDM34: Enables TXD to reset alarms and warnings associated to MON3 and MON4 during a TXD
event.
0 = TXD event has no effect on the MON3 and MON4 alarms, warnings, and quick trips.
1 = MON3 and MON4 alarms, warnings, and quick trips are reset during a TXD event.
BIT 4
TXDFG: See Figure 15.
0 = FETG, an internal signal, has no effect on TXDOUT.
1 = FETG is enabled and ORed with other possible signals to create TXDOUT.
BIT 3
TXDFLT: See Figure 15.
0 = TXF pin has no effect on TXDOUT.
1 = TXF pin is enabled and ORed with other possible signals to create TXDOUT.
BIT 2
TXDIO: See Figure 15.
0 = (Default) TXD input signal is enabled and ORed with other possible signals to create TXDOUT.
1 = TXD input signal has no effect on TXDOUT.
BITS 1:0
RSSI_FC and RSSI_FF: RSSI Force Coarse and RSSI Force Fine. Control bits for RSSI mode of
operation on the MON3 conversion.
00b = Normal RSSI mode of operation (default).
01b = The fine settings of scale and offset are used for MON3 conversions.
10b = The coarse settings of scale and offset are used for MON3 conversions.
11b = Normal RSSI mode of operation.