73K224L-28IH/F 查看數據表（PDF） - Teridian Semiconductor Corporation

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73K224L-28IH/F

V.22bis, V.22, V.21, Bell 212A, 103 Single-Chip Modem

Teridian Semiconductor Corporation 

73K224L

V.22bis, V.22, V.21, Bell 212A, 103

Single-Chip Modem

DATA SHEET

CONTROL REGISTER 2 (continued)

CR2

100

BIT NO.

D4

D5

D6

D7

D7

D6

0

SPEC REG

ACCESS

NAME

Transmit S1

Call Init

Special

Register

Access

Not used at this time

D5

D4

D3

D2

D1

D0

CALL INIT TRANSMIT 16WAY

S1

RESET

DSP

TRAIN

INHIBIT

EQUALIZER

ENABLE

CONDITION DESCRIPTION

0

The transmitter when placed in alternating mark/space

mode transmits 0101...... scrambled or not dependent on

the bypass scrambler bit.

1

When this bit is 1 and only when the transmitter is placed in

alternating mark/space mode by CR1 bits D7, D6, and in

DPSK or QAM, an unscrambled repetitive double dibit

pattern of 00 and 11 at 1200 bit/s (S1) is sent.

0

DEMOD mode: The DSP is setup to do demodulation and

pattern detection based on the various mode bits. Both

answer tones are detected in demod mode concurrently (wide

band detection); TR-D0 is ignored.

1

CALL INIT mode: The DSP decodes unscrambled mark,

answer tone and call progress tones.

0

Normal CR3 access.

1

Setting this bit and addressing CR3 allows access to the

SPECIAL REGISTER. See the SPECIAL REGISTER for

details.

0

Only write zero to this bit.

CONTROL REGISTER 3

CR3

101

D7

TXDALT

D6

TRISTATE

TX/RXCLK

D5

D4

D3

D2

D1

0

RECEIVE TRANSMIT TRANSMIT TRANSMIT

BOOST

ATTEN. 3 ATTEN. 2 ATTEN. 1

ENABLE

D0

TRANSMIT

ATTEN. 0

BIT NO.

D3, D2,

D1,D0

D4

D5

D6

NAME

Transmit

Attenuator

Receive Gain

Boost

Not used at this time

TRISTATE

TXCLK/RXCLK

CONDITION

D3 D2 D1 D0

00 00

11 11

0

1

0

0

1

DESCRIPTION

Sets the attenuation level of the transmitted signal in 1dB

steps. The default (D3-D0=0100) is for a transmit level of –

10 dBm0 on the line with the recommended hybrid transmit

gain. The total range is 16 dB.

18 dB receive front end boost is not used.

Boost is in the path. This boost does not change reference

levels. It is used to extend dynamic range by compensating

for internally generated noise when receiving weak signals.

The receive level detect signal and knowledge of the hybrid

and transmit attenuator setting will determine when boost

should be enabled.

Only write zero to this bit.

TXCLK and RXCLK are driven.

TXCLK and RXCLK are tri-stated.

D7

TXDALT

Spec. Reg. Bit D3=1 Alternate TX data source. See Special Register.

Page: 15 of 31

© 2005, 2008 TERIDIAN Semiconductor Corporation

Rev 7.1

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