ds21ft40 Maxim Integrated Products, Inc., ds21ft40 Datasheet - Page 64

• Manufacturer Part Number: ds21ft40
• Description: Ds21ft40 Four X Three 12 Channel E1 Framer
• Manufacturer: Maxim Integrated Products, Inc.

TDC2: TRANSMIT HDLC DS0 CONTROL REGISTER 2 (Address = BB Hex)
15.
In many architectures, the outputs of individual framers are combined into higher speed serial buses to
simplify transport across the system. The DS21FT40 can be configured to allow each framer’s data and
signaling busses to be multiplexed into higher speed data and signaling busses eliminating external
hardware saving board space and cost. In particular, the four framers associated with each DS21Q44 die
can be combined.
The interleaved PCM bus option supports two bus speeds and interleave modes. The 4.096 MHz bus
speed allows two framers to share a common bus. The 8.192 MHz bus speed allows all four of the
framers for each DS21Q44 die to share a common bus. Framers can interleave their data either on byte or
frame boundaries. Framers that share a common bus must be configured through software and require
several device pins to be connected together externally (see figures 15-1 & 15-2). Each framer’s elastic
stores must be enabled and configured for 2.048 MHz operation. The signal RSYNC must be configured
as an input on each framer.
(MSB)
TDB8
SYMBOLS
SYMBOLS
TDB8
TDB7
TDB6
TDB5
TDB4
TDB3
TDB2
TDB1
TD4
TD3
TD2
TD1
TD0
INTERLEAVED PCM BUS OPERATION
TDB7
POSITION
POSITION
TDC1.4
TDC1.3
TDC1.2
TDC1.1
TDC1.0
TDC2.7
TDC2.6
TDC2.5
TDC2.4
TDC2.3
TDC2.2
TDC2.1
TDC2.0
TDB6
NAME AND DESCRIPTION
NAME AND DESCRIPTION
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.
DS0 Bit 8 Suppress Enable. MSB of the DS0. Set to one to
stop this bit from being used.
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.
TDB5
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TDB4
TDB3
TDB2
(LSB)
TDB1
DS21FT40