73K224BL
V.22bis, V.22, V.21, Bell 212A, 103
Single-Chip Modem w/ Integrated Hybrid
DATA SHEET
CONTROL REGISTER 3
CR3
D7
D6
D5
D4
D3
D2
D1
D0
ADDR TXDALT TRI-STATE
OH
RECEIVE
BOOST
ENABLE
TRANSMIT
ATTEN. 3
TRANSMIT
ATEN 2
TRANSMIT
ATTEN. 1
TRANSMIT
ATTEN. 0
101
TX/RXCLK
NAME
BIT
CONDITION
DESCRIPTION
D3 D2 D1 D0
D3, D2,
D1,D0
Transmit
Attenuator
0
1
0
1
0
1
0
1
Sets the attenuation level of the transmitted signal in 1 dB
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.
D4
Receive Gain
Boost
0
1
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.
D5
D6
D7
OH
0
1
0
1
Relay driver open.
Open drain driver pulling low.
TXCLK and RXCLK are driven.
TXCLK and RXCLK are tri-stated.
Tri-state
TXCLK/RXCLK
TXDALT
Special Register Alternate TX data source (see Special Register).
Bit D3=1
Page: 18 of 33
© 2005, 2008 TERIDIAN Semiconductor Corporation
Rev 7.1
TERIDIAN [ TERIDIAN SEMICONDUCTOR CORPORATION ]
