Rainbow-electronics MAX3799 Manual do Utilizador descarregar pdf (Página 24)

MAX3799

Transmitter Control Register (TXCTRL)

Bit 3: TXDE_EN. Enables or disables the transmit output deemphasis circuitry.

0 = disabled

1 = enabled

Bit 2: SOFTRES. Resets all registers to their default values.

0 = normal

1 = reset

Bit 1: TX_POL. Controls the polarity of the transmit signal path.

0 = inverse

1 = normal

Bit 0: TX_EN. Enables or disables the transmit circuitry.

0 = disabled

1 = enabled

Transmitter Status Register 1 (TXSTAT1)

Bit 7: FST[7]. When the V

CCT

supply voltage is below 2.45V, the POR circuitry reports a FAULT. Once the V

CCT

supply voltage is above 2.55V, the POR resets all registers to their default values and the FAULT is cleared.

Bit 6: FST[6]. When the voltage at BMON is above V

- 0.55V, a SOFT FAULT is reported.

Bit 3: FST[3]. When the common-mode voltage at V

TOUT

+/- goes below 1.5V, a SOFT FAULT is reported.

Bit 2: FST[2]. When the voltage at V

TOUT

+/- goes below 0.8V, a HARD FAULT is reported.

Bit 1: FST[1]. When the BIAS voltage goes below 0.44V, a HARD FAULT is reported.

Bit 0: TX_FAULT. Copy of a FAULT signal in FST[7] to FST[1]. A POR resets FST[7:1] to 0.

Transmitter Status Register 2 (TXSTAT2)

Bit 3: IMODERR. When the modulation-incremented result is greater than IMODMAX, a SOFT FAULT is reported.

See the

Programming Modulation Current

section.

1Gbps to 14Gbps, SFP+ Multirate Limiting

Amplifier and VCSEL Driver

24 ______________________________________________________________________________________

Bit #

(STICKY)

ADDRESS

Name FST[7] FST[6] X X FST[3] FST[2] FST[1] TX_FAULT

Default Value X X X X X X X X

H0x06

Bit # 7 6 5 4

(STICKY)

ADDRESS

Name X X X X IMODERR IBIASERR TXED X

Default Value X X X X X X X X

H0x07

Bit # 7 6 5 4 3 2 1 0 ADDRESS

Name X X X X TXDE_EN SOFTRES TX_POL TX_EN

Default Value X X X X 0 0 1 1

H0x05

1 2 ... 19 20 21 22 23 24 25 26 27 28 29 ... 34 35

Amplifier and VCSEL Driver 1

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