DS3182 datasheet(48/389 Pages) MAXIM

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TYPE

FUNCTION

TNEGn /

TOHMOn

Transmit Negative AMI / Line OH Mask

TNEGn: When the port line is configured for B3ZS, HDB3 or AMI mode and the

framer is not configured for one of the “-OHM” modes (see Table 10-32) and the

transmit line interface pins are enabled (PORT.CR2.TLEN), a high on this pin

indicates that a negative pulse should be transmitted on the line. The signal is

updated on the positive clock edge of the referenced clock pin if the clock pin signal is

not inverted, otherwise it is updated on the falling edge of the clock. The signal is

typically referenced to the TLCLKn line clock output pins, but it can be referenced to

the TCLKOn, TCLKIn, RLCLKn or RCLKOn pins.

This output signal can be inverted.

DS3: 44.736 Mbps +20ppm

E3: 34.368 Mbps +20ppm

CC52: 52 Mbps +20ppm

TOHMOn: When the framer is configured for one of the “-OHM” modes (see Table

10-32) and the transmit line interface pins are enabled (PORT.CR2.TLEN), the

transmit overhead mask signal is output on this pin. This signal is a delayed version

of TOHMIn or ROHMIn when in local loopback (three clock period delay). This signal

will be high to indicate that the data on TDATn is not valid data and can be

overwritten by external logic to add an external frame signal. This signal will be low to

indicate that the data on TDATn is valid. The signal is updated on the positive clock

edge of the referenced clock pin if the clock pin signal is not inverted, otherwise it is

updated on the falling edge of the clock. The signal is typically referenced to the

TLCLKn line clock output pins, but it can be referenced to the TCLKOn, TCLKIn,

RLCLKn or RCLKOn pins.

This output signal can be inverted.

TXPn

Transmit Positive Analog

TXPn: This pin and the TXNn pin form a differential AMI output which is coupled to

the outbound 75

W coaxial cable through a 2:1 step-down transformer (Figure 1-1).

This output is enabled when the TX LIU is enabled and the output is enabled to be

driven. When it is not enabled, it is in a high impedance state.

DS3: 44.736 Mbps +20ppm

E3: 34.368 Mbps +20ppm

CC52: 52 Mbps +20ppm

TXNn

Transmit Negative Analog

TXNn: This pin and the TXPn pin form a differential AMI output which is coupled to

the outbound 75

W coaxial cable through a 2:1 step-down transformer (Figure 1-1).

This output is enabled when the TX LIU is enabled and the output is enabled to be

driven. When it is not enabled, it is in a high impedance state.

DS3: 44.736 Mbps +20ppm

E3: 34.368 Mbps +20ppm

CC52: 52 Mbps +20ppm

RXPn

Receive Positive analog

RXPn: This pin and the RXNn pin form a differential AMI input which is coupled to the

outbound 75

W coaxial cable through a 2:1 step-up transformer (Figure 1-1). This input

is used when the RX LIU is enabled and is ignored when the LIU is disabled.

DS3: 44.736 Mbps +20ppm

E3: 34.368 Mbps +20ppm

CC52: 52 Mbps +20ppm

RXNn

Receive Negative analog

RXNn: This pin and the RXPn pin form a differential AMI input which is coupled to the

outbound 75

W coaxial cable through a 2:1 step-up transformer (Figure 1-1). This input

is used when the LIU is enabled and is ignored when the LIU is disabled.

DS3: 44.736 Mbps +20ppm

E3: 34.368 Mbps +20ppm

CC52: 52 Mbps +20ppm

DS3182 Datasheet(PDF) 48 Page - Maxim Integrated Products

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