Datasheet

DS1878
SFP+ Controller with Digital LDD Interface
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Table 02h, Register B8h: LOS RANGING
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)
B8h RESERVED HLOS
2
HLOS
1
HLOS
0
RESERVED LLOS
2
LLOS
2
1 LLOS
0
BIT 7 BIT 0
This register controls the full-scale range of the quick-trip monitoring for the differential inputs of MON3.
BIT 7 RESERVED (Default = 0)
BITS 6:4
HLOS[2:0]: HLOS Full-Scale Ranging. 3-bit value to select the FS comparison voltage for high LOS
found on MON3. Default is 000b and creates an FS of 1.25V.
HLOS[2:0] % OF 1.25V FS VOLTAGE (V)
000b 100.00 1.250
001b 80.00 1.000
010b 66.67 0.833
011b 50.00 0.625
100b 40.00 0.500
101b 33.33 0.417
110b 28.57 0.357
111b 25.00 0.313
BIT 3 RESERVED (Default = 0)
BITS 2:0
LLOS[2:0]: LLOS Full-Scale Ranging. 3-bit value to select the FS comparison voltage for low LOS
found on MON3. Default is 000b and creates an FS of 1.25V.
LLOS[2:0] % OF 1.25V FS VOLTAGE (V)
000b 100.00 1.250
001b 80.00 1.000
010b 66.67 0.833
011b 50.00 0.625
100b 40.00 0.500
101b 33.33 0.417
110b 28.57 0.357
111b 25.00 0.313