Rainbow Electronics DS1876 - Manual (Page 44)

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DS1876
SFP Controller with Dual LDD Interface
Table 01h, Register FDh–FFh: RESERVED
Table 02h Register Descriptions
Table 02h, Register 80h: MODE
POWER-ON VALUE
READ ACCESS
N/A
WRITE ACCESS N/A
A2h AND B2h MEMORY N/A
MEMORY TYPE N/A
These registers are reserved.
POWER-ON VALUE 7Fh
READ ACCESS PW2 or (PW1 and RWTBL2) or (PW1 and RTBL2)
WRITE ACCESS PW2 or (PW1 and RWTBL2)
A2h AND B2h MEMORY Common A2h and B2h memory location
MEMORY TYPE Volatile
80h SEEB MOD2EN QT2EN APC2EN AEN MOD1EN QT1EN APC1EN
BIT 7 BIT 0
BIT 7
SEEB:
0 = (default) Enables EEPROM writes to SEE bytes.
1 = Disables EEPROM writes to SEE bytes during configuration, so that the configuration of the
part is not delayed by the EE cycle time. Once the values are known, write this bit to a 0 and write
the SEE locations again for data to be written to the EEPROM.
BIT 6
MOD2EN:
0 = MOD2 DAC is writable by the user and the LUT recalls are disabled. This allows the user to
interactively test their modules by writing the values for MOD2. The output is updated with the new
value at the end of the write cycle. The I
2 C STOP condition is the end of the write cycle.
1 = (default) Enables automatic control of the LUT for MOD2 DAC.
BIT 5
QT2EN:
0 = QTs (HBIAS, TXP HI, TXP LO) for transmitter 2 are writable by the user and the LUT recalls are
disabled. This allows the user to interactively test their modules by writing to the QT thresholds.
The thresholds are updated with the new values at the end of the write cycle. The I
2 C STOP
condition is the end of the write cycle.
1 = (default) Enables automatic control of the LUT QTs for transmitter 2.
BIT 4
APC2EN:
0 = APC2 DAC is writable by the user and the LUT recalls are disabled. This allows the user to
interactively test their modules by writing the values for APC2. The output is updated with the new
value at the end of the write cycle. The I
2 C STOP condition is the end of the write cycle.
1 = (default) Enables automatic control of the LUT for APC2 DAC.
BIT 3
AEN:
0 = The temperature-calculated index value TINDEX is writable by the user and the updates
of calculated indexes are disabled. This allows the user to interactively test their modules by
controlling the indexing for the LUTs. The recalled values from the LUTs appear in the DAC
registers after the next completion of a temperature conversion.
1 = (default) The temperature-calculated index value TINDEX is used to control the LUTs.