Ds1874 sfp+ controller with digital ldd interface – Rainbow Electronics DS1874 User Manual
Page 75
DS1874
SFP+ Controller with Digital LDD Interface
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75
Table 02h, Register C7h: TBLSELPON
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)
C7h 2
7
2
6
2
5
2
4
2
3
2
2
2
1
2
0
BIT
7
BIT
0
Chooses the initial value for the table-select byte (Lower Memory, Register 7Fh) at power-on.
FACTORY
DEFAULT
0000h
READ ACCESS
PW2 or (PW1 and RWTBL246) or (PW1 and RTBL246)
WRITE ACCESS
(PW2 and BIAS EN = 0) or (PW1 and RWTBL246 and BIAS EN = 0)
MEMORY
TYPE Volatile
C8h
0 0 0 0 0 0 0 2
8
C9h 2
7
2
6
2
5
2
4
2
3
2
2
2
1
2
0
BIT
7
BIT
0
When BIAS EN (Table 02h, Register 80h) is written to 0, writes to these bytes control the BIAS register, which then
updates the MAX3798/MAX3799 SET_IBIAS register.
FACTORY
DEFAULT
00h
READ ACCESS
PW2 or (PW1 and RWTBL246) or (PW1 and RTBL246)
WRITE ACCESS
(PW2 and BIAS EN = 0) or (PW1 and RWTBL246 and BIAS EN = 0)
MEMORY
TYPE
Volatile
CAh RESERVED RESERVED RESERVED RESERVED RESERVED RESERVED RESERVED MAN_CLK
BIT
7
BIT
0
When BIAS EN (Table 02h, Register 80h) is written to 0, MAN_CLK controls the updates of the MAN BIAS value to
the BIAS register. This new value is sent through the 3-wire interface. The values of MAN BIAS must be written with
a separate write command. Setting MAN_CLK to a 1 clocks the MAN BIAS value to the BIAS register, which then
updates the MAX3798/MAX3799 SET_IBIAS register.
1) Write the MAN BIAS value with a write command.
2) Set the MAN_CLK bit to a 1 with a separate write command.
3) Clear the MAN_CLK bit to a 0 with a separate write command.
Table 02h, Register C8h–C9h: MAN BIAS
Table 02h, Register CAh: MAN_CNTL