DS3161 datasheet(48/384 Pages) MAXIM

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DS3161/DS3162/DS3163/DS3164

TYPE

FUNCTION

TSOFIn /

TOHMIn

Transmit Start Of Frame Input / OH Mask Input

See Table 10-18.

TSOFIn: When the port framer is configured for any of the DS3 or E3 non “-OHM”

framed modes, this signal can be used to align the start of the DS3 or E3 frames on

the TSER pin to an external signal. In the fractional mode, the TSOFIn signal can be

used to align the start of frame signal position on the TSERn/TOHn

pin to the rising edge of a signal on this pin. The signal edge does not need to occur

on every frame and can be tied high or low. The signal is sampled on the positive

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

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

TCLKIn transmit clock input pins, but it can be referenced to the TLCLKn, TCLKOn,

RCLKOn and RLCLKn clock pins.

This signal can be inverted.

TOHMIn: When the port framer is configured for one of the “- OHM” modes, this

signal is used to mark clock periods when valid data bits are available on the TDATn

output pins. When this signal is low, valid data bits bits will be available on the

TDATn output pins three clock periods later. This signal precedes the signal on

TDATn and TOHMOn by three clock periods. The signal is sampled on the positive

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

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

TCLKIn transmit clock input pins, but it can be referenced to the TLCLKn, TCLKOn,

RCLKOn and RLCLKn clock pins.

This signal can be inverted.

TSERn /

TPOHn /

TFOHn /

Transmit Serial Data / PLCP Overhead / Fractional Overhead

See Table 10-19.

TSERn: When the port framer is configured for Flexible Fractional mode, this pin is

used as the source of the DS3/E3 payload data. The signal is sampled on the

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

otherwise it is sampled on the falling edge of the clock. The signal is typically

referenced to the TCLKIn transmit clock input pins, but it can be referenced to the

TLCLKn, TCLKOn / TGCLKn, RCLKOn and RLCLKn clock pins

This signal can be inverted.

DS3: 44.736 Mbps +20ppm

E3: 34.368 Mbps +20ppm

CC52: 52 Mbps +20ppm

TPOHn: When the port framer is configured for one of the DS3 or E3 PLCP framing

modes, and the port is enabled, this signal will be used to over-write the DS3 or E3

PLCP framing overhead bits when TPOHENn is active. The TPOHSOFn signal marks

the start of the framing bit sequence. This signal is sampled at the same time as the

TPOHCLKn signal transitions high to low.

This signal can be inverted.

TFOHn: When the port framer is configured for one of the DS3 or E3 internal or

external fractional framing modes, and the port is enabled the internal fractional

framing modes, this pin can be used to source the fractional overhead data. The

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

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

signal is typically referenced to the TCLKIn transmit clock input pins, but it can be

referenced to the TLCLKn, TCLKOn / TGCLKn, RCLKOn and RLCLKn clock pins

This signal can be inverted.

DS3161 Datasheet(PDF) 48 Page - Maxim Integrated Products

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