73K324BL
CCITT V.22bis,V.23,V.22,V.21, Bell 212A
Single-Chip Modem w/ Integrated Hybrid
DATA SHEET
CONTROL REGISTER 3
D7
D6
D5
D4
D3
D2
D1
D0
CR3 TXDALT TRI-STATE
OH
RECEIVE
BOOST
TRANSMIT TRANSMIT TRANSMIT TRANSMIT
101
TX/RXCLK
ATTEN. 3
ATEN 2
ATTEN. 1
ATTEN. 0
ENABLE
BIT
NAME
CONDITION
D3 D2 D1 D0
DESCRIPTION
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 34
© 2005, 2008 TERIDIAN Semiconductor Corporation
Rev 6.1
TERIDIAN [ TERIDIAN SEMICONDUCTOR CORPORATION ]
