ds1878 Maxim Integrated Products, Inc., ds1878 Datasheet - Page 49

• Manufacturer Part Number: ds1878
• Description: Sfp+ Controller With Digital Ldd Interface
• Manufacturer: Maxim Integrated Products, Inc.

Lower Memory, Register 7Bh–7Eh: PASSWORD ENTRY (PWE)
Lower Memory, Register 7Fh: TABLE SELECT (TBL SEL)
7Bh
7Ch
7Dh
7Fh
7Eh
POWER-ON VALUE
READ ACCESS
WRITE ACCESS
MEMORY TYPE
The upper memory tables of the device are accessible by writing the desired table value in this register. The power-on
value of this register is defined by the value written to TBLSELPON (Table 02h, Register C7h).
POWER-ON VALUE
READ ACCESS
WRITE ACCESS
MEMORY TYPE
There are two passwords for the device. 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
SFP+ Controller with Digital LDD Interface
7
7
______________________________________________________________________________________
2
2
2
2
2
30
22
14
6
6
TBLSELPON (Table 02h, Register C7h)
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
8
0
0
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