DS1864 Maxim Integrated Products, DS1864 Datasheet - Page 49

• Manufacturer Part Number: DS1864
• Description: SFP Laser Controller and Diagnostic IC
• Manufacturer: Maxim Integrated Products

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Table 04h (Table 01h in DS1859 Configuration), 89h: Logic Configuration
FACTORY DEFAULT:
MEMORY TYPE:
Logic control bits for alarm and warning flags, as well as internal and external signals.
Table 04h (Table 01h in DS1859 Configuration), 8Ah: Configuration
FACTORY DEFAULT:
MEMORY TYPE:
For ces coar se or fi ne m easur em ent for M ON 3 ( RS S I) i np ut. N ote: D ual - r ang e functi onal i ty can b e d i sab l ed b y w r i ti ng thi s r eg i ster to 01h.
89h
8Ah
bit7:2
bit7
bit6
bit5
bit4
bit3
bit2
bit1
bit0
bit7
bit1
bit0
bit7
X
X
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
0 = A2h I
1 = I
Mode: Selects between DS1852/DS1856 memory configuration or DS1859 memory configuration. The
next I
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]
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 = C oar se m easur em ent for ced . If b oth RS S IC and RS S IF ar e 1, then the C oar se m easur em ent i s 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.
LOSC
2
00h
C address determined by value in Table 04h (Table 01h in DS1859 configuration), register 8Ch.
Shadowed Memory (SEE)
2
00h
Shadowed Memory (SEE)
C command will be to the selected configuration if a change is made. Does not require a power
X
2
C address selected (default).
____________________________________________________________________
X
X
2
C slave address is used.
ADFIX
SFP Laser Controller and
X
Mode
X
INV
Diagnostic IC
X
RSSIC
X
RSSIF
INVL
bit0
bit0
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