DS1864 datasheet(49/72 Pages) DALLAS

49 / 72 page

SFP Laser Controller and

Diagnostic IC

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Table 04h (Table 01h in DS1859 Configuration), 89h: Logic Configuration

FACTORY DEFAULT:

00h

MEMORY TYPE:

Shadowed Memory (SEE)

89h

LOSC

ADFIX

Mode

INV

INVL

bit7

bit0

Logic control bits for alarm and warning flags, as well as internal and external signals.

bit7

This bit is not used.

bit6

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.

bit5

This bit is not used.

bit4

ADFIX: Determines which I

2C slave address is used.

0 = A2h I

2C address selected (default).

1 = I

2C address determined by value in Table 04h (Table 01h in DS1859 configuration), register 8Ch.

bit3

Mode: Selects between DS1852/DS1856 memory configuration or DS1859 memory configuration. The

next I

2C 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.

bit2

INV: Used for polarity inversion or non-inversion if an externally generated TXF is used. See Figure 12.

TX-F=[INV[XOR]INTXF]

bit1

This bit is not used.

bit0

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:

00h

MEMORY TYPE:

Shadowed Memory (SEE)

8Ah

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

No function.

bit1

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.

bit0

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.

DS1864 Datasheet(PDF) 49 Page - Dallas Semiconductor

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