Ds1876 sfp controller with dual ldd interface – Rainbow Electronics DS1876 User Manual
Page 51
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DS1876
SFP Controller with Dual LDD Interface
Table 02h, Register 8Dh: RANGING
1
FACTORY DEFAULT
00h
READ ACCESS
PW2 or (PW1 and RWTBL2) or (PW1 and RTBL2)
WRITE ACCESS
PW2 or (PW1 and RWTBL2)
A2h AND B2h MEMORY
Common A2h and B2h memory location
MEMORY TYPE
Nonvolatile (SEE)
8Dh
RESERVED
HBIAS1
2
HBIAS1
1
HBIAS1
0
RESERVED
TXP1
2
TXP1
1
TXP1
0
BIT 7
BIT 0
The upper nibble of this byte controls the full-scale range of the QT monitoring for BMON1. The lower nibble of
this byte controls the full-scale range for the QT monitoring for PMON1.
BITS 7, 3
RESERVED (default = 0)
BITS 6:4
HBIAS1
[2:0]
: HBIAS1 full-scale ranging: 3-bit value to select the full-scale comparison voltage for
BMON1. Default is 000b and creates a full scale of 1.25V.
HBIAS1
[2:0]
% OF 1.25V
FS VOLTAGE (V)
000b
100.00
1.250
001b
80.03
1.000
010b
66.71
0.834
011b
50.07
0.626
100b
40.08
0.501
101b
33.41
0.418
110b
28.65
0.358
111b
25.08
0.314
BITS 2:0
TXP1
[2:0]
: TXP1 full-scale ranging: 3-bit value to select the full-scale comparison voltage for
PMON1. Default is 000b and creates a full scale of 2.5V.
TXP1
[2:0]
% OF 2.5V
FS VOLTAGE (V)
000b
100.00
2.507
001b
80.03
2.006
010b
66.71
1.672
011b
50.07
1.255
100b
40.08
1.005
101b
33.41
0.838
110b
28.65
0.718
111b
25.08
0.629