DS1878T+ Maxim Integrated Products, DS1878T+ Datasheet - Page 80

• Manufacturer Part Number: DS1878T+
• Description: IC CTLR SFP W/DGTL LDD RX 28TQFN
• Manufacturer: Maxim Integrated Products
• Type: SFP+ Controllerr

Specifications of DS1878T+

• Input Type: *
• Output Type: *
• Interface: *
• Current - Supply: *
• Mounting Type: Surface Mount
• Package / Case: 28-WFQFN exposed Pad
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

SFP+ Controller with Digital LDD Interface
Table 02h, Register C7h: TBLSELPON
Table 02h, Register C8h–C9h: MAN BIAS
Table 02h, Register CAh: MAN_CNTL
80
______________________________________________________________________________________
CAh
C7h
C8h
C9h
FACTORY DEFAULT
READ ACCESS
WRITE ACCESS
MEMORY TYPE
When BIAS EN (Table 02h, Register 80h) is written to 0, MAN_CLK controls the updates of the MAN BIAS value to the
BIAS register. This new value is sent through the 3-wire interface. The values of MAN BIAS must be written with a
separate write command. Setting MAN_CLK to a 1 clocks the MAN BIAS value to the BIAS register, which then
updates a Maxim laser driver SET_IBIAS register.
1) Write the MAN BIAS value with a write command.
2) Set the MAN_CLK bit to a 1 with a separate write command.
3) Clear the MAN_CLK bit to a 0 with a separate write command.
FACTORY DEFAULT
READ ACCESS
WRITE ACCESS
MEMORY TYPE
Chooses the initial value for the table-select byte (Lower Memory, Register 7Fh) at power-on.
FACTORY DEFAULT
READ ACCESS
WRITE ACCESS
MEMORY TYPE
When BIAS EN (Table 02h, Register 80h) is written to 0, writes to these bytes control the BIAS register, which then
updates a Maxim laser driver SET_IBIAS register.
RESERVED
BIT 7
BIT 7
BIT 7
2
2
0
7
7
RESERVED
2
2
0
6
6
00h
PW2 or (PW1 and RWTBL246) or (PW1 and RTBL246)
(PW2 and BIAS EN = 0) or (PW1 and RWTBL246 and BIAS EN = 0)
Volatile
00h
PW2 or (PW1 and RWTBL246) or (PW1 and RTBL246)
PW2 or (PW1 and RWTBL246)
Nonvolatile (SEE)
RESERVED
0000h
PW2 or (PW1 and RWTBL246) or (PW1 and RTBL246)
(PW2 and BIAS EN = 0) or (PW1 and RWTBL246 and BIAS EN = 0)
Volatile
2
2
0
5
5
RESERVED
2
2
0
4
4
RESERVED
2
2
0
3
3
RESERVED
2
2
0
2
2
RESERVED
2
2
0
1
1
MAN_CLK
BIT 0
BIT 0
BIT 0
2
2
2
8
0
0