ds1878 Maxim Integrated Products, Inc., ds1878 Datasheet - Page 85

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

Table 02h, Register EDh: IMODMAX
Table 02h, Register EEh: IBIASMAX
EDh
EEh
SFP+ Controller with Digital LDD Interface
FACTORY DEFAULT
READ ACCESS
WRITE ACCESS
MEMORY TYPE
A 3-wire slave register. After either V
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.
FACTORY DEFAULT
READ ACCESS
WRITE ACCESS
MEMORY TYPE
A 3-wire slave register. After either V
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.
BIT 7
BIT 7
______________________________________________________________________________________
2
2
7
7
2
2
6
6
00h
PW2 or (PW1 and RWTBL246) or (PW1 and RTBL246)
PW2 or (PW1 and RWTBL246)
Nonvolatile (SEE)
00h
PW2 or (PW1 and RWTBL246) or (PW1 and RTBL246)
PW2 or (PW1 and RWTBL246)
Nonvolatile (SEE)
2
2
5
5
CC
CC
exceeds POA (after a POR event), the Maxim laser driver TX_POR bit is set
exceeds POA (after a POR event), the Maxim laser driver TX_POR bit is
2
2
4
4
2
2
3
3
2
2
2
2
2
2
1
1
BIT 0
BIT 0
2
2
0
0
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