Rainbow Electronics DS1874 - Manual (Page 66)

DS1874
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 input’s 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
000b 100.00 1.250
001b 80.02 1.0003
010b 66.69 0.8336
011b 50.10 0.6263
100b 40.05 0.5006
101b 33.38 0.4173
110b 26.62 0.3328
111b 25.04 0.3130
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
000b 100.00 1.250
001b 80.02 1.0003
010b 66.69 0.8336
011b 50.10 0.6263
100b 40.05 0.5006
101b 33.38 0.4173
110b 26.62 0.3328
111b 25.04 0.3130