DS3151 datasheet(17/60 Pages) DALLAS

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DS3151/DS3152/DS3153/DS3154 Single/Dual/Triple/Quad DS3/E3/STS-1 LIUs

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TCRn

Transmitter Configuration Register

01h, 11h, 21h, 31h

Bit

Name

—

TBIN

TCINV

TJA

TPD

TTS

TLBO

—

Default

—

Bit 6: Transmitter Binary Interface Enable (TBIN)

0 = Transmitter framer interface is bipolar on the TPOS and TNEG pins. The B3ZS/HDB3 encoder is

disabled.

1 = Transmitter framer interface is binary on the TDAT pin. The B3ZS/HDB3 encoder is enabled.

Bit 5: Transmitter Clock Invert (TCINV)

0 = TPOS/TDAT and TNEG are sampled on the rising edge of TCLK.

1 = TPOS/TDAT and TNEG are sampled on the falling edge of TCLK.

Bit 4: Transmitter Jitter Attenuator Enable (TJA)

0 = Remove jitter attenuator from the transmitter path.

1 = Insert jitter attenuator into the transmitter path.

Bit 3: Transmitter Power-Down Enable (TPD)

0 = enable the transmitter

1 = power-down the transmitter (output driver tri-stated)

Bit 2: Transmitter Tri-State Enable (TTS). This bit is set to 1 on reset, which tri-states the transmitter TXP and

TXN pins. The transmitter circuitry is left powered up in this mode. The

TTS input pin is inverted and logically ORed

with this bit.

0 = enable the transmitter output driver

1 = tri-state the transmitter output driver

Bit 1: Transmitter Line Build-Out (TLBO). TLBO indicates cable length for waveform shaping in DS3 and STS-1

modes. TLBO is ignored in E3 mode.

0 = cable length

³ 225ft

1 = cable length < 225ft

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