Datasheet

31Maxim Integrated
SFP Controller for Dual Rx Interface
DS1877
Lower Memory, Register 20h–21h: RSSI ALARM HI
Lower Memory, Register 24h–25h: RSSI WARN HI
Lower Memory, Register 22h–23h: RSSI ALARM LO
Lower Memory, Register 26h–27h: RSSI WARN LO
FACTORY DEFAULT FFFFh
READ ACCESS All
WRITE ACCESS PW2 or (PW1 and WLOWER)
A2h AND B2h MEMORY Different A2h and B2h memory locations
MEMORY TYPE Nonvolatile (SEE)
20h, 24h 2
15
2
14
2
13
2
12
2
11
2
10
2
9
2
8
21h, 25h 2
7
2
6
2
5
2
4
2
3
2
2
2
1
2
0
BIT 7 BIT 0
Voltage measurement updates above this unsigned threshold set its corresponding alarm or warning bit.
Voltage measurements equal to or below this threshold clear its alarm or warning bit.
FACTORY DEFAULT 0000h
READ ACCESS All
WRITE ACCESS PW2 or (PW1 and WLOWER)
A2h AND B2h MEMORY Different A2h and B2h memory locations
MEMORY TYPE Nonvolatile (SEE)
22h, 26h 2
15
2
14
2
13
2
12
2
11
2
10
2
9
2
8
23h, 27h 2
7
2
6
2
5
2
4
2
3
2
2
2
1
2
0
BIT 7 BIT 0
Voltage measurement updates below this unsigned threshold set its corresponding alarm or warning bit. Voltage
measurements equal to or above this threshold clear its alarm or warning bit.