Rainbow-electronics MAX3798 Manual de usuario descargar pdf (Pagina 23)

MAX3798

1.0625Gbps to 10.32Gbps, Integrated, Low-

Power SFP+ Limiting Amplifier and VCSEL Driver

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Bit 2: RX_EN. Enables or disables the receive circuitry.

0 = disabled

1 = enabled

Bit 1: RXDE_EN. Enables or disables the deemphasis on the receiver output.

0 = disabled

1 = enabled

Bit 0: AZ_EN. Enables or disables the autozero circuitry. When RX_EN is set to 0, the autozero circuitry is also disabled.

0 = disabled

1 = enabled

Receiver Status Register (RXSTAT)

Bit 0: LOS. Copy of the LOS output circuitry. This is a sticky bit, which means that it is cleared on a read. The first 0-

to-1 transition gets latched until the bit is read by the master or POR occurs.

Output CML Level Setting Register (SET_CML)

Bits 7 to 0: SET_CML[7:0]. The SET_CML register is an 8-bit register that can be set to range from 0 to 255, corre-

sponding from 40mV

P-P

to 1200mV

P-P

. See the

Typical Operating Characteristics

section for a typical CML output

voltage vs. DAC code graph.

LOS Threshold Level Setting Register (SET_LOS)

Bits 5 to 0: SET_LOS[5:0]. The SET_LOS register is a 6-bit register used to program the LOS threshold. See the

Typical Operating Characteristics

section for a typical LOS threshold voltage vs. DAC code graph.

Bit # 7 6 5 4 3 2 1

(STICKY)

ADDRESS

Name X X X X X X X LOS

Default Value X X X X X X X X

H0x02

Bit # 7 6 5 4 3 2 1 0 ADDRESS

Name

SET_CML[7]

(MSB)

SET_CML[6] SET_CML[5] SET_CML[4] SET_CML[3] SET_CML[2] SET_CML[1]

SET_CML[0]

(LSB)

Default Value 0 1 0 1 0 0 1 1

H0x03

Bit # 7 6 5 4 3 2 1 0 ADDRESS

Name X X

SET_LOS[5]

(MSB)

SET_LOS[4] SET_LOS[3] SET_LOS[2] SET_LOS[1]

SET_LOS[0]

(LSB)

Default Value X X 0 0 1 1 0 0

H0x04

1 2 ... 18 19 20 21 22 23 24 25 26 27 28 ... 34 35

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Rainbow-electronics MAX3798 Manual de usuario Pagina 23

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