ds1878 Maxim Integrated Products, Inc., ds1878 Datasheet - Page 90

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

Table 02h, Register F7h: 3WSET
Table 02h, Register F8h: 3WCTRL
SFP+ Controller with Digital LDD Interface
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F8h
F7h
FACTORY DEFAULT
READ ACCESS
WRITE ACCESS
MEMORY TYPE
FACTORY DEFAULT
READ ACCESS
WRITE ACCESS
MEMORY TYPE
RESERVED
RESERVED
BITS 7:2
BITS 7:3
BITS 1:0
BIT 7
BIT 1
BIT 0
BIT 7
BIT 2
RESERVED
3WRW: Initiates a 3-wire write or read operation. The write command uses the memory address
found in the 3-wire ADDRESS register (Table 02h, Register F9h) and the data from the 3-wire WRITE
register (Table 02h, Register FAh). This bit clears itself at the completion of the write operation.
The read command uses the memory address found in the 3-wire ADDRESS register (Table 02h,
Register F9h). The address determines whether a read or write operation is to be performed. This
bit clears itself at the completion of the read operation.
0 = (Default) Reads back as 0 when the write or read operation is completed.
1 = Initiates a 3-wire write or read operation.
3WDIS: Disables all automatic communication across the 3-wire interface. This includes all
updates from the LUTs, APC loop, and status registers. The only 3-wire communication is with the
manual mode of operation.
0 = (Default) Automatic communication is enabled.
1 = Disables automatic communication.
RESERVED
TXPORDIS: Transmit POR Disable.
0 = The 3-wire interface monitors the TXPOR bit in the laser driver’s TXSTAT1 register.
1 = The 3-wire interface ignores the TXPOR bit in the laser driver’s TXSTAT1 register.
EXCTRL[1:0]: Extra 3-Wire Control Register Selection. Used to enable/disable the 3-wire registers.
00 = SETTXEQ and SETLOSTIMER are enabled.
01 = Device mode. SETTEXEQ, SETLOSTIMER, RXCTRL3, TXCTRL2, and TXCTRL3 are disabled.
10 = SETTXEQ, SETLOSTIMER, and RXCTRL3 are enabled.
11 = SETTXEQ, SETLOSTIMER, RXCTRL3, TXCTRL2, and TXCTRL3 are enabled.
RESERVED
RESERVED
00h
PW2 or (PW1 and RWTBL246) or (PW1 and RTBL246)
PW2 or (PW1 and RWTBL246)
Volatile
00h
PW2 or (PW1 and RWTBL246) or (PW1 and RTBL246)
PW2 or (PW1 and RWTBL246)
Nonvolatile (SEE)
RESERVED
RESERVED
RESERVED
RESERVED
RESERVED
RESERVED
RESERVED
TXPORDIS
EXCTRL1
3WRW
EXCTRL2
3WDIS
BIT 0
BIT 0