DS1876 datasheet(25/69 Pages) MAXIM

25 / 69 page

______________________________________________________________________________________ 25

SFP Controller with Dual LDD Interface

Lower Memory Register Map

Table 01h Register Map

<C> or <_/C> = Common, <D> or <_/D> = Different, <M> or <_/M> = Mixture of common and different.

Note: The ALARM ENABLE bytes (Registers F8h–FFh) can be configured to exist in Table 05h instead of here at Table 01h with

the MASK bit (Table 02h, Register 88h). If the row is configured to exist in Table 05h, these location are empty in Table 01h.

The access codes represent the factory default values of PW_ENA and PW_ENB (Table 02h, Registers C0h–C1h).

These registers also allow for custom permissions.

LOWER MEMORY

ROW

(HEX)

ROW NAME

WORD 0

WORD 1

WORD 2

WORD 3

BYTE 0/8

BYTE 1/9

BYTE 2/A

BYTE 3/B

BYTE 4/C

BYTE 5/D

BYTE 6/E

BYTE 7/F

<1/C> THRESHOLD0

TEMP ALARM HI

TEMP ALARM LO

TEMP WARN HI

TEMP WARN LO

<1/C > THRESHOLD1

VCC ALARM HI

VCC ALARM LO

VCC WARN HI

VCC WARN LO

<1/D> THRESHOLD2

BMON ALARM HI

BMON ALARM LO

BMON WARN HI

BMON WARN LO

<1/D> THRESHOLD3

PMON ALARM HI

PMON ALARM LO

PMON WARN HI

PMON WARN LO

20–40

<1/C > EEPROM

48–50

<1/D > EEPROM

<1/C > EEPROM

<2/M> ADC VALUES0

<C>TEMP VALUE

<C> VCC VALUE

<D>BMON VALUE

<D>PMON VALUE

<0/M> ADC VALUES1

RESERVED

<0/M>STATUS

<3/D> UPDATE

<5/D> ALARM/WARN

ALARM3

ALARM2

ALARM1

RESERVED

WARN3

RESERVED

<0/M> TABLE SELECT

RESERVED

<6/C> PWE MSW

<6/C> PWE LSW

<5/D> TBL SEL

TABLE 01h

ROW

(HEX)

ROW NAME

WORD 0

WORD 1

WORD 2

WORD 3

BYTE 0/8

BYTE 1/9

BYTE 2/A

BYTE 3/B

BYTE 4/C

BYTE 5/D

BYTE 6/E

BYTE 7/F

80–F7

<1/C> EEPROM

<7/M>ALARM ENABLE <M>ALARM EN3

RESERVED

<D>ALARM EN1

RESERVED

<M>WARN EN3

RESERVED

ACCESS

CODE

<0/_>

<1/_>

<2/_>

<3/_>

<4/_>

<5/_>

<6/_>

<7/_>

<8/_>

<9/_>

<10/_>

<11/_>

Read

Access

See each

bit/byte

separately

All

PW2

All

N/A

PW1

PW2

N/A

PW2

All

Write

Access

PW2

N/A

All and

DS1876

Hardware

PW2 +

mode

bit

All

PW1

PW2

N/A

PW1

DS1876 Datasheet(PDF) 25 Page - Maxim Integrated Products

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