SFP Laser Controller and
Diagnostic IC
Lower Memory Register 6Eh: Logic States
POWER-ON VALUE:
MEMORY TYPE:
x0xx0xxx b
Volatile (SRAM)
WRITE
ACCESS
6Eh
N/A
TXDS
ALL
TXDC
N/A
IN1S
N/A
SELS
ALL
SELC
N/A
TXF
N/A
RXL
N/A
RDYB
bit7
bit7
bit6
bit5
bit4
bit3
bit2
bit1
bit0
bit0
TXDS: TX-Disable Status bit. Indicates the state of the TX-D pin.
0 = TX-D pin is low.
1 = TX-D pin is high.
TXDC: Soft TX-Disable bit. A control bit set by the user in order to control the On/Off state of both
DAC outputs.
0 = DACs enabled (Default).
1 = Forces the DAC0 and DAC1 outputs to a high-impedance (off) mode.
IN1S: A status bit reflecting the state of the IN1 input pin.
SELS: A status bit reflecting the state of the RSEL input pin.
SELC: Soft Rate Select. A control bit that set by the user and OR’d with SELS to set the state of the
RESELOUT pin. Used for bandwidth selection.
0 = (Default)
1 = This bit allows software control over the state of the RESELOUT pin.
TXF: A status bit that indicates the state of TX-F output pin.
0 = TX-F pin is at logic 0
1 = TX-F pin is at logic 1
RXL: A status bit that indicates the state of RX-LOS input pin.
0 = RX-LOS pin is at logic 0
1 = RX-LOS pin is at logic 1
RDBY: Ready Bar.
0 = V CC is above POA.
1 = V CC is below POA.
Lower Memory Register 6Fh: Reserved Memory
6Fh
RESERVED FOR SFF-8079
34
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