ds1876 Maxim Integrated Products, Inc., ds1876 Datasheet - Page 34

• Manufacturer Part Number: ds1876
• Description: Sfp Controller With Dual Ldd Interface
• Manufacturer: Maxim Integrated Products, Inc.

SFP Controller with Dual LDD Interface
Lower Memory, Register 6Eh: STATUS
34
Write Access
_____________________________________________________________________________________
6Eh
POWER-ON VALUE
READ ACCESS
WRITE ACCESS
A2h AND B2h MEMORY
MEMORY TYPE
<D>
BIT 7
BIT 7
BIT 6
BIT 5
BIT 4
BIT 3
BIT 2
BIT 1
BIT 0
N/A
TXDS
TXDS1 [A2h]: TXD1 status bit. Reflects the logic state of the TXD1 pin (read-only).
0 = TXD1 pin is logic-low.
1 = TXD1 pin is logic-high.
TXDS2 [B2h]: TXD2 status bit. Reflects the logic state of the TXD2 pin (read-only).
0 = TXD2 pin is logic-low.
1 = TXD2 pin is logic-high.
TXDC1 [A2h]: TXD1 software control bit. This bit allows for software control that is identical to the
TXD1 pin. See the DACs as a Function of Transmit Disable (TXD1, TXD2) section for further infor-
mation. Its value is wire-ORed with the logic value of the TXD1 pin (writable by all users).
0 = (default)
1 = Forces the device into a TXD1 state regardless of the value of the TXD1 pin.
TXDC2 [B2h]: TXD2 software control bit. This bit allows for software control that is identical to the
TXD2 pin. See the DACs as a Function of Transmit Disable (TXD1, TXD2) section for further infor-
mation. Its value is wire-ORed with the logic value of the TXD2 pin (writable by all users).
0 = (default)
1 = Forces the device into a TXD2 state regardless of the value of the TXD2 pin.
IN1S [A2h or B2h]: IN1 status bit. Reflects the logic state of the IN1 pin (read-only).
0 = IN1 pin is logic-low.
1 = IN1 pin is logic-high.
RSELS [A2h or B2h]: RSEL status bit. Reflects the logic state of the RSEL pin (read-only).
0 = RSEL pin is logic-low.
1 = RSEL pin is logic-high.
RSELC [A2h or B2h]: RSEL software control bit. This bit allows for software control that is iden-
tical to the RSEL pin. Its value is wire-ORed with the logic value of the RSEL pin to create the
RSELOUT pin’s logic value (writable by all users).
0 = (default)
1 = Forces the device into a RSEL state regardless of the value of the RSEL pin.
TXFS1 [A2h]: Reflects state of the TXF1 pin (read-only).
0 = TXF1 pin is low.
1 = TXF1 pin is high.
TXFS2 [B2h]: Reflects the state of the TXF2 pin (read-only).
0 = TXF2 pin is low.
1 = TXF2 pin is high.
RAM1 [A2h]: Volatile memory location.
RAM2 [B2h]: Volatile memory location.
RDYB [A2h or B2h]: Ready bar.
0 = V
1 = V
<D>
All
TXDC
CC
CC
is above POA.
is below POA and/or too low to communicate over the I
X0XX 0XXXb
All
See below
Mixture of common memory locations and different memory locations (see below)
Volatile
<C>
N/A
IN1S
<C>
RSELS
All
<C>
RSELC
All
<D>
N/A
TXFS
2
C bus.
<D>
N/A
RAM
<C>
BIT 0
N/A
RDYB