DS21354/DS21554 3.3V/5V E1 Single-Chip Transceivers
TDC1: TRANSMIT HDLC DS0 CONTROL REGISTER 1 (Address = BA Hex)
(MSB)
(LSB)
THE
TSaDS
TDS0M
TD4
TD3
TD2
TD1
TD0
SYMBOL POSITION
NAME AND DESCRIPTION
Transmit HDLC Enable.
0 = disable HDLC controller (no data inserted by HDLC controller into
the transmit data stream)
THE
TDC1.7
1 = enable HDLC controller to allow insertion of HDLC data into either
the Sa position or multiple DS0 channels as defined by TDC1 (see bit
definitions below).
Transmit Sa Bit / DS0 Select. This bit is ignored if TDC1.7 is set to zero.
0 = route Sa bits from the HDLC controller. TD0 to TD4 defines which Sa
bits are to be routed. TD4 corresponds to Sa4, TD3 to Sa5, TD2 to Sa6,
TD1 to Sa7 and TD0 to Sa8.
TSaDS
TDC1.6
TDC1.5
1 = route DS0 channels from the HDLC controller. TDC1.5 is used to
determine how the DS0 channels are selected.
DS0 Selection Mode.
0 = utilize the TD0 to TD4 bits to select which single DS0 channel to use.
1 = utilize the TCHBLK control registers to select which DS0 channels to
use.
TDS0M
TD4
TD3
TD2
TD1
TD0
TDC1.4
TDC1.3
TDC1.2
TDC1.1
TDC1.0
DS0 Channel Select Bit 4. MSB of the DS0 channel select.
DS0 Channel Select Bit 3.
DS0 Channel Select Bit 2.
DS0 Channel Select Bit 1.
DS0 Channel Select Bit 0. LSB of the DS0 channel select.
TDC2: TRANSMIT HDLC DS0 CONTROL REGISTER 2 (Address = BB Hex)
(MSB)
(LSB)
TDB8
TDB7
TDB6
TDB5
TDB4
TDB3
TDB2
TDB1
SYMBOL POSITION
NAME AND DESCRIPTION
DS0 Bit 8 Suppress Enable. MSB of the DS0. Set to one to stop this bit
from being used.
TDB8
TDC2.7
TDB7
TDB6
TDB5
TDB4
TDB3
TDB2
TDC2.6
TDC2.5
TDC2.4
TDC2.3
TDC2.2
TDC2.1
DS0 Bit 7 Suppress Enable. Set to one to stop this bit from being used.
DS0 Bit 6 Suppress Enable. Set to one to stop this bit from being used.
DS0 Bit 5 Suppress Enable. Set to one to stop this bit from being used.
DS0 Bit 4 Suppress Enable. Set to one to stop this bit from being used.
DS0 Bit 3 Suppress Enable. Set to one to stop this bit from being used.
DS0 Bit 2 Suppress Enable. Set to one to stop this bit from being used.
DS0 Bit 1 Suppress Enable. LSB of the DS0. Set to one to stop this bit
from being used.
TDB1
TDC2.0
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