Datasheet

DS1878
SFP+ Controller with Digital LDD Interface
76 ______________________________________________________________________________________
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)
BCh 2
7
2
6
2
5
2
4
2
3
2
2
2
1
2
0
BIT 7 BIT 0
Fast-comparison DAC threshold adjust for high TXP. This value is added to the APC DAC value recalled from
Table 06h. If the sum is greater than 0xFF, 0xFF is used. Comparisons greater than V
HTXP
, compared against
V
MON2
, create a TXP HI alarm. The same ranging applied to the APC DAC should be used here.
V
HTXP
=
Full Scale
255
 HTXP + APC DAC
()
Table 02h, Register BCh: HTXP
Table 02h, Register BDh: LTXP
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)
BDh 2
7
2
6
2
5
2
4
2
3
2
2
2
1
2
0
BIT 7 BIT 0
Fast-comparison DAC threshold adjust for low TXP. This value is subtracted from the APC DAC value recalled
from Table 06h. If the difference is less than 0x00, 0x00 is used. Comparisons less than V
LTXP
, compared
against V
MON2
, create a TXP LO alarm. The same ranging applied to the APC DAC should be used here.
V
LTXP
=
Full Scale
255
 APC DAC  LTXP
()