DS1874 datasheet(75/88 Pages) MAXIM

75 / 88 page

SFP+ Controller with Digital LDD Interface

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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

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

C9h

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

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

DS1874 Datasheet(PDF) 75 Page - Maxim Integrated Products

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