Datasheet

DS1878
SFP+ Controller with Digital LDD Interface
68 ______________________________________________________________________________________
FACTORY DEFAULT 30h
READ ACCESS PW2 or (PW1 and RWTBL246) or (PW1 and RTBL246)
WRITE ACCESS PW2 or (PW1 and RWTBL246)
MEMORY TYPE Nonvolatile (SEE)
8Fh RESERVED MON3C
2
MON3C
1
MON3C
0
RESERVED MON3F
2
MON3F
1
MON3F
0
BIT 7 BIT 0
Allows for right-shifting the final answer of MON3 coarse (MON3C) and MON3 fine (MON3F) voltage measurements.
This allows for scaling the measurements to the smallest full-scale voltage and then right-shifting the final result
so the reading is weighted to the correct LSB.
Table 02h, Register 8Fh: RIGHT-SHIFT
0
(RSHIFT
0
)
Table 02h, Register 90h–91h: XOVER COARSE
FACTORY DEFAULT 0000h
READ ACCESS PW2 or (PW1 and RWTBL2) or (PW1 and RTBL2)
WRITE ACCESS PW2 or (PW1 and RWTBL2)
MEMORY TYPE Nonvolatile (SEE)
90h 2
15
2
14
2
13
2
12
2
11
2
10
2
9
2
8
91h 2
7
2
6
2
5
2
4
2
3
2
2
2
1
0
BIT 7 BIT 0
Defines the crossover value for RSSI measurements of nonlinear inputs when XOVEREN is set to 1 (Table 02h,
Register 8Bh). MON3 coarse conversion results (before right-shifting) less than this register are clamped to the
value of this register.