Rainbow Electronics MAX3798 - Manual (Page 32)

MAX3798
1.0625Gbps to 10.32Gbps, Integrated, Low-
Power SFP+ Limiting Amplifier and VCSEL Driver
32 ______________________________________________________________________________________
REGISTER
FUNCTION/
ADDRESS
REGISTER
NAME
NORMAL
MODE
SETUP
MODE
BIT
NUMBER
/TYPE
BIT NAME
DEFAULT
VALUE
NOTES
R R 7 SET_IMOD[0] 0
LSB of SET_IMOD DAC
register address = H0x09
R R 6 X 0
R R 5 DE_INC 0
Deemphasis increment
0: no update, 1: SET_TXDE
updates
±1 LSB
RW RW 4 MODINC[4] 0
MSB MOD DAC two’s
complement
RW RW 3 MODINC[3] 0
RW RW 2 MODINC[2] 0
RW RW 1 MODINC[1] 0
Modulation
Current Increment
Setting Register
Address = H0x0C
MODINC
RW RW 0 MODINC[0] 0
LSB MOD DAC two’s
complement
R R 7 SET_IBIAS[0] 0
LSB of SET_IBIAS DAC
register address = H0x08
R R 6 X 0
R R 5 X 0
RW RW 4 BIASINC[4] 0
MSB bias DAC two’s
complement
RW RW 3 BIASINC[3] 0
RW RW 2 BIASINC[2] 0
RW RW 1 BIASINC[1] 0
Bias Current
Increment Setting
Register
Address = H0x0D
BIASINC
RW RW 0 BIASINC[0] 0
LSB bias DAC two’s
complement
RW RW 7 MODECTRL[7] 0 MSB mode control
RW RW 6 MODECTRL[6] 0
RW RW 5 MODECTRL[5] 0
RW RW 4 MODECTRL[4] 0
RW RW 3 MODECTRL[3] 0
RW RW 2 MODECTRL[2] 0
RW RW 1 MODECTRL[1] 0
Mode Control
Register
Address = H0x0E
MODECTRL
RW RW 0 MODECTRL[0] 0 LSB mode control
R RW 3 SET_PWCTRL[3] 0 MSB Tx pulse-width control
R RW 2 SET_PWCTRL[2] 0
R RW 1 SET_PWCTRL[1] 0
Transmitter Pulse-
Width Control
Register
Address = H0x0F
SET_
PWCTRL
R RW 0 SET_PWCTRL[0] 0 LSB Tx pulse-width control
R RW 3 SET_TXDE[3] 0 MSB Tx deemphasis
R RW 2 SET_TXDE[2] 0
R RW 1 SET_TXDE[1] 0
Transmitter
Deemphasis
Control Register
Address = H0x10
SET_TXDE
R RW 0 SET_TXDE[0] 0 LSB Tx deemphasis
Table 7. Register Summary (continued)