Datasheet

DS1878
SFP+ Controller with Digital LDD Interface
88 ______________________________________________________________________________________
Table 02h, Register EDh: IMODMAX
FACTORY DEFAULT 00h
READ ACCESS PW2 or (PW1 and RWTBL246) or (PW1 and RTBL246)
WRITE ACCESS PW2 or (PW1 and RWTBL246)
MEMORY TYPE Nonvolatile (SEE)
EDh 2
7
2
6
2
5
2
4
2
3
2
2
2
1
2
0
BIT 7 BIT 0
A 3-wire slave register. After either V
CC
exceeds POA (after a POR event), the Maxim laser driver TX_POR bit is set
high (visible in 3W TXSTAT1, Bit 7), or on a rising edge of TXD, this value is written to a Maxim laser driver
through the 3-wire interface.
FACTORY DEFAULT 00h
READ ACCESS PW2 or (PW1 and RWTBL246) or (PW1 and RTBL246)
WRITE ACCESS PW2 or (PW1 and RWTBL246)
MEMORY TYPE Nonvolatile (SEE)
EEh 2
7
2
6
2
5
2
4
2
3
2
2
2
1
2
0
BIT 7 BIT 0
A 3-wire slave register. After either V
CC
exceeds POA (after a POR event), the Maxim laser driver TX_POR bit is
set high (visible in 3W TXSTAT1, Bit 7) or on a rising edge of TXD, this value is written to a Maxim laser driver
through the 3-wire interface. In addition, this value defines the maximum DAC value allowed for the upper 8 bits
of BIAS output during APC closed-loop operations. During the intial step and binary search, this value does not
cause an alarm but still clamps the BIAS register value. After the startup seqence (or normal APC operations), if
the APC loop tries to create a BIAS value greater than this setting, it is clamped and creates a MAX BIAS alarm.
Table 02h, Register EEh: IBIASMAX