Ds1876 sfp controller with dual ldd interface – Rainbow Electronics DS1876 User Manual
Page 67
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DS1876
SFP Controller with Dual LDD Interface
Table 06h, Register E8h–EFh: HTXP LUT
Table 06h, Register F0h–F7h: LTXP LUT
FACTORY DEFAULT
00h
READ ACCESS
PW2 or (PW1 and RWTBL46)
WRITE ACCESS
PW2 or (PW1 and RWTBL46)
A2h AND B2h MEMORY
Different A2h and B2h memory locations
MEMORY TYPE
Nonvolatile (EE)
E8h–EFh
2
7
2
6
2
5
2
4
2
3
2
2
2
1
2
0
BIT 7
BIT 0
The HTXP LUT is used to temperature compensate the transmit power-high QT threshold (TXP HI). The table
below shows the range of temperature for each byte’s location. The table shows a rising temperature; for a fall-
ing temperature there is 1NC of hysteresis.
E8h
Less than or equal to -8NC
E9h
Greater than -8NC up to +8NC
EAh
Greater than +8NC up to +24NC
EBh
Greater than +24NC up to +40NC
ECh
Greater than +40NC up to +56NC
EDh
Greater than +56NC up to +72NC
EEh
Greater than +72NC up to +88NC
EFh
Greater than +88NC
FACTORY DEFAULT
00h
READ ACCESS
PW2 or (PW1 and RWTBL46)
WRITE ACCESS
PW2 or (PW1 and RWTBL46)
A2h AND B2h MEMORY
Different A2h and B2h memory locations
MEMORY TYPE
Nonvolatile (EE)
F0h–F7h
2
7
2
6
2
5
2
4
2
3
2
2
2
1
2
0
BIT 7
BIT 0
The LTXP LUT is used to temperature compensate the transmit power-low QT threshold (TXP LO). The table
below shows the range of temperature for each byte’s location. The table shows a rising temperature; for a fall-
ing temperature there is 1NC of hysteresis.
F0h
Less than or equal to -8NC
F1h
Greater than -8NC up to +8NC
F2h
Greater than +8NC up to +24NC
F3h
Greater than +24NC up to +40NC
F4h
Greater than +40NC up to +56NC
F5h
Greater than +56NC up to +72NC
F6h
Greater than +72NC up to +88NC
F7h
Greater than +88NC