ds1876 Maxim Integrated Products, Inc., ds1876 Datasheet - Page 39
ds1876
Manufacturer Part Number
ds1876
Description
Sfp Controller With Dual Ldd Interface
Manufacturer
Maxim Integrated Products, Inc.
Datasheet
1.DS1876.pdf
(69 pages)
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Lower Memory, Registers 75h–7Ah: RESERVED MEMORY
Lower Memory, Registers 7Bh–7Eh: PASSWORD ENTRY (PWE)
7Ch
7Dh
7Bh
7Eh
POWER-ON VALUE
READ ACCESS
WRITE ACCESS
A2h AND B2h MEMORY
MEMORY TYPE
These registers are reserved. The value when read is 00h.
POWER-ON VALUE
READ ACCESS
WRITE ACCESS
A2h AND B2h MEMORY
MEMORY TYPE
There are two passwords for the DS1876. Each password is 4 bytes long. The lower level password (PW1) has
all the access of a normal user plus those made available with PW1. The higher level password (PW2) has all the
access of PW1 plus those made available with PW2. The values of the passwords reside in EEPROM inside PW2
memory. At power-up, all PWE bits are set to 1. All reads at this location are 0.
BIT 7
2
2
2
2
______________________________________________________________________________________
31
23
15
7
SFP Controller with Dual LDD Interface
2
2
2
2
30
22
14
6
N/A
N/A
N/A
N/A
FFFF FFFFh
N/A
All
Common A2h and B2h memory location
Volatile
2
2
2
2
29
21
13
5
2
2
2
2
28
20
12
4
2
2
2
2
27
19
11
3
2
2
2
2
26
18
10
2
2
2
2
2
25
17
9
1
BIT 0
2
2
2
2
24
16
8
0
39
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