IDT82P2821 datasheet(89/152 Pages) RENESAS

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IDT82P2821

21(+1) CHANNEL HIGH-DENSITY T1/E1/J1 LINE INTERFACE UNIT

Programming Information

February 6, 2009

TCF0 - Transmit Configuration Register 0

Address: 004H, 044H, 084H, 0C4H, 104H, 144H, 184H, 1C4H, (CH1~CH8)

204H, 244H, 284H, 2C4H, 304H, 344H, 384H, 3C4H, (CH9~CH16)

404H, 444H, 484H, 4C4H, 504H, (CH17~CH21)

7C4H (CH0)

Type: Read / Write

Default Value: 00H

Bit

Name

Description

Reserved.

This bit determines the output of the Line Driver, i.e., the output on the TTIPn and TRINGn pins.

0: High-Z. (default)

1: Normal operation.

T_OFF

This bit determines whether the transmitter is powered down.

0: Normal operation. (default)

1: Power down.

THZ_OC

This bit determines the output of the Line Driver, i.e., the output on the TTIPn and TRINGn pins when TOC is detected.

0: The output current is limited to 100 mAp-p. (default)

1: The output current is limited to 100 mAp-p within the first 1 ms after the TOC is detected and then the output is in High-Z state

when the TOC is detected for more than 1 ms.

T_SING

This bit determines the transmit line interface.

0: Transmit Differential line interface. Both TTIPn and TRINGn are used to transmit signal to the line side. (default)

1: Transmit Single Ended line interface. Only TTIPn is used to transmit signal. TRINGn should be left open.

2 - 0

T_TERM[2:0] These bits select the impedance matching mode of the transmit path to match the cable impedance.

000: The 100

Ω internal impedance matching is selected for T1 100 Ω twisted pair cable (with transformer). (default)

001: The 110

Ω internal impedance matching is selected for J1 110 Ω twisted pair cable (with transformer).

010: The 120

Ω internal impedance matching is selected for E1 120 Ω twisted pair cable (with transformer).

011: The 75

Ω internal impedance matching is selected for E1 75 Ω coaxial cable (with transformer).

100: The 100

Ω internal impedance matching is selected for T1 100 Ω twisted pair cable (transformer-less).

101: The 110

Ω internal impedance matching is selected for J1 110 Ω twisted pair cable (transformer-less).

110: The 120

Ω internal impedance matching is selected for E1 120 Ω twisted pair cable (transformer-less).

111: The external impedance matching is selected for E1 120

Ω twisted pair cable or E1 75 Ω coaxial cable (with transformer).

7654321

T_OFF

THZ_OC

T_SING

T_TERM2

T_TERM1

T_TERM0

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