Datasheet

DS1878
SFP+ Controller with Digital LDD Interface
52 ______________________________________________________________________________________
Lower Memory, Register 7Bh–7Eh: PASSWORD ENTRY (PWE)
POWER-ON VALUE FFFF FFFFh
READ ACCESS N/A
WRITE ACCESS All
MEMORY TYPE Volatile
7Bh 2
31
2
30
2
29
2
28
2
27
2
26
2
25
2
24
7Ch 2
23
2
22
2
21
2
20
2
19
2
18
2
17
2
16
7Dh 2
15
2
14
2
13
2
12
2
11
2
10
2
9
2
8
7Eh 2
7
2
6
2
5
2
4
2
3
2
2
2
1
2
0
BIT 7 BIT 0
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.
POWER-ON VALUE TBLSELPON (Table 02h, Register C7h)
READ ACCESS All
WRITE ACCESS All
MEMORY TYPE Volatile
7Fh 2
7
2
6
2
5
2
4
2
3
2
2
2
1
2
0
BIT 7 BIT 0
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).
Lower Memory, Register 7Fh: TABLE SELECT (TBL SEL)