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SFP Laser Controller and
Diagnostic IC
Table 04h (Table 01h in DS1859 Configuration), 89h: Logic Configuration
FACTORY DEFAULT:
MEMORY TYPE:
00h
Shadowed Memory (SEE)
89h
X
LOSC
X
ADFIX
Mode
INV
X
INVL
bit7
Logic control bits for alarm and warning flags, as well as internal and external signals.
bit0
bit7
bit6
bit5
bit4
bit3
bit2
bit1
bit0
This bit is not used.
LOSC: A LOS channel configuration bit.
0 = The analog signal MON3, resulting from RSSI, is compared to a threshold, asserting LOS if it is
lower than the threshold.
1 = A digital input signal, INLOS, is used as the source for the LOS signal.
This bit is not used.
ADFIX: Determines which I 2 C slave address is used.
0 = A2h I 2 C address selected (default).
1 = I 2 C address determined by value in Table 04h (Table 01h in DS1859 configuration), register 8Ch.
Mode: Selects between DS1852/DS1856 memory configuration or DS1859 memory configuration. The
next I 2 C command will be to the selected configuration if a change is made. Does not require a power
cycle.
0 = DS1852 configuration selected (default).
1 = DS1859 configuration selected.
INV: Used for polarity inversion or non-inversion if an externally generated TXF is used. See Figure 12.
TX-F=[INV[XOR]INTXF]
This bit is not used.
INVL: Used for polarity inversion or non-inversion if an externally generated INLOS signal is used.
RXLOS=[INVL[XOR]INLOS]
Table 04h (Table 01h in DS1859 Configuration), 8Ah: Configuration
FACTORY DEFAULT:
MEMORY TYPE:
00h
Shadowed Memory (SEE)
8Ah
X
X
X
X
X
X
RSSIC
RSSIF
bit7
bit0
Forces coarse or fine measurement for MON3 (RSSI) input. Note: Dual-range functionality can be disabled by writing this register to 01h.
bit7:2
bit1
bit0
No function.
RSSIC: Force the dual range conversion to use Coarse measurement only. This is used for calibration
of MON3.
0 = Coarse measurement not forced.
1 = Coarse measurement forced. If both RSSIC and RSSIF are 1, then the Coarse measurement is used.
RSSIF: Force the dual range conversion to use Fine measurement only. This is used for calibration of
MON3.
0 = Fine measurement not forced.
1 = Fine measurement forced. If both RSSIC and RSSIF are 1, then the Coarse measurement is used.
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