DS1875T+TR MAXIM [Maxim Integrated Products], DS1875T+TR Datasheet - Page 56

• Manufacturer Part Number: DS1875T+TR
• Description: PON Triplexer and SFP Controller
• Manufacturer: MAXIM [Maxim Integrated Products]

PON Triplexer and SFP Controller
Lower Memory, Register 7Bh to 7Eh: Password Entry (PWE)
Lower Memory, Register 7Fh: Table Select (TBL SEL)
56
7Bh
7Ch
7Dh
7Fh
7Eh
______________________________________________________________________________________
POWER-ON VALUE
READ ACCESS
WRITE ACCESS
MEMORY TYPE
POWER-ON VALUE
READ ACCESS
WRITE ACCESS
MEMORY TYPE
The upper memory tables (Table 00h to 08h) of the DS1875 are accessible by writing the desired table value in this
register.
There are two passwords for the DS1875. 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
BIT 7
2
2
2
2
2
31
23
15
7
7
2
2
2
2
2
30
22
14
6
6
00h
All
All
Volatile
FFFF FFFFh
N/A
All
Volatile
2
2
2
2
2
29
21
13
5
5
2
2
2
2
2
28
20
12
4
4
2
2
2
2
2
27
19
11
3
3
2
2
2
2
2
26
18
10
2
2
2
2
2
2
2
25
17
1
9
1
BIT 0
BIT 0
2
2
2
2
2
24
16
0
8
0