Datasheet

59Maxim Integrated
SFP Controller for Dual Rx Interface
DS1877
Table 02h, Register C6h: POLARITY
Table 02h, Register C2h–C5h: RESERVED
FACTORY DEFAULT 00h
READ ACCESS N/A
WRITE ACCESS N/A
A2h AND B2h MEMORY N/A
MEMORY TYPE N/A
These registers are reserved.
FACTORY DEFAULT 0Ah
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 locations
MEMORY TYPE Nonvolatile (SEE)
C6h RESERVED RESERVED RESERVED RESERVED DAC2P RESERVED DAC1P RESERVED
BIT 7 BIT 0
BITS 7:4,
2, 0
RESERVED
BIT 3
DAC2P: DAC2 VALUE polarity. The DAC2 VALUE (Table 02h, Registers C8h–C9h) range is
000h–3FFh. A setting of 000h creates a pulse-density of zero and 3FFh creates a pulse-density of
1023/1024. This polarity bit allows the user to use GND or V
REFIN
as the reference. The power-on
of DAC2 VALUE is 000h; thus an application that needs V
REFIN
to be the off state should use the
inverted polarity.
0 = Normal polarity. A setting of 000h results in a pulse-density output of zero held at GND, and a
setting of 3FFh results in a pulsed-density output of 1023/1024 held mostly at V
REFIN
.
1 = Inverted polarity. A setting of 000h results in a pulse-density output of zero held at V
REFIN,
and
a setting of 3FFh results in a pulsed-density output of 1023/1024 held mostly at GND.
BIT 1
DAC1P: DAC1 VALUE polarity. The DAC1 VALUE (Table 02h, Registers CCh–CDh) range is
000h–3FFh. A setting of 000h creates a pulse-density of zero and 3FFh creates a pulse-density of
1023/1024. This polarity bit allows the user to use GND or V
REFIN
as the reference. The power-on
of DAC1 VALUE is 000h; thus an application that needs V
REFIN
to be the off state should use the
inverted polarity.
0 = Normal polarity. A setting of 000h results in a pulse-density output of zero held at GND, and a
setting of 3FFh results in a pulsed-density output of 1023/1024 held mostly at V
REFIN
.
1 = Inverted polarity. A setting of 000h results in a pulse-density output of zero held at V
REFIN,
and
a setting of 3FFh results in a pulsed-density output of 1023/1024 held mostly at GND.