Rainbow Electronics DS1874 - Manual (Page 67)

DS1874
SFP+ Controller with Digital LDD Interface
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Table 02h, Register B9h: COMP RANGING
FACTORY DEFAULT 00h
READ ACCESS PW2
WRITE ACCESS PW2
MEMORY TYPE Nonvolatile (SEE)
B9h RESERVED BIAS 2 BIAS 1 BIAS 0 RESERVED APC 2 APC 1 APC 0
BIT 7 BIT 0
The upper nibble of this byte controls the full-scale range of the quick-trip monitoring for BIAS. The lower nibble of
this byte controls the full-scale range for the quick-trip monitoring of the APC reference as well as the closed-loop
monitoring of APC.
BIT 7 RESERVED (Default = 0)
BITS 6:4
BIAS[2:0]: BIAS Full-Scale Ranging. 3-bit value to select the FS comparison voltage for BIAS found
on MON1. Default is 000b and creates an FS of 1.25V.
BIAS[2:0] % of 1.25V FS Voltage
000b 100.00 1.250
001b 80.04 1.0005
010b 66.73 0.8341
011b 50.10 0.6263
100b 40.12 0.5015
101b 33.46 0.4183
110b 28.70 0.3588
111b 25.13 0.3141
BIT 3 RESERVED (Default = 0)
BITS 2:0
APC[2:0]: APC Full-Scale Ranging. 3-bit value to select the FS comparison voltage for MON2 with
the APC. Default is 000b and creates an FS of 2.5V.
APC[2:0] % of 2.50V FS Voltage
000b 100.00 2.500
001b 80.04 2.0010
010b 66.73 1.6683
011b 50.10 1.2525
100b 40.12 1.0030
101b 33.46 0.8365
110b 28.70 0.7175
111b 25.13 0.6283