Datasheet

38 Maxim Integrated
SFP Controller for Dual Rx Interface
DS1877
Lower Memory, Register 73h: ALARM
0
Lower Memory, Register 74h: WARN
3
POWER-ON VALUE 00h
READ ACCESS All
WRITE ACCESS N/A
A2h AND B2h MEMORY Different A2h and B2h memory locations
MEMORY TYPE Volatile
73h LOS HI LOS LO RESERVED RESERVED RESERVED RESERVED RESERVED RESERVED
BIT 7 BIT 0
BIT 7
LOS HI: High alarm status for RSSI; fast comparison. A TXD event does not clear this alarm.
0 = (default) Last comparison was below threshold setting.
1 = Last comparison was above threshold setting.
BIT 6
LOS LO: Low alarm status for RSSI; fast comparison. A TXD event does not clear this alarm.
0 = (default) Last comparison was above threshold setting.
1 = Last comparison was below threshold setting.
BITS 5:0 RESERVED
POWER-ON VALUE 10h
READ ACCESS All
WRITE ACCESS N/A
A2h AND B2h MEMORY Different A2h and B2h memory locations
MEMORY TYPE Volatile
74h TEMP HI TEMP LO VCC HI VCC LO RESERVED RESERVED RESERVED RESERVED
BIT 7 BIT 0
BIT 7
TEMP HI: High warning status for temperature measurement.
0 = (default) Last measurement was equal to or below threshold setting.
1 = Last measurement was above threshold setting.
BIT 6
TEMP LO: Low warning status for temperature measurement.
0 = (default) Last measurement was equal to or above threshold setting.
1 = Last measurement was below threshold setting.
BIT 5
VCC HI: High warning status for V
CC
measurement.
0 = (default) Last measurement was equal to or below threshold setting.
1 = Last measurement was above threshold setting.
BIT 4
VCC LO: Low warning status for V
CC
measurement. This bit is set when the V
CC
supply is below the
POA trip-point value. It clears itself when a V
CC
measurement is completed and the value is above the
low threshold.
0 = Last measurement was equal to or above threshold setting.
1 = (default) Last measurement was below threshold setting.
BITS 3:0 RESERVED