DS21Q41BTN Dallas Semiconducotr, DS21Q41BTN Datasheet - Page 13

• Manufacturer Part Number: DS21Q41BTN
• Description: Quad T1 Framer
• Manufacturer: Dallas Semiconducotr

DS21Q41B FRAMER DECODE Table 1-6
2.0 PARALLEL PORT
The DS21Q41B is controlled via either a non-mutliplexed (MUX=0) or multiplexed (MUX=1) by an
external microcontroller or microprocessor. The DS21Q41B can operate with either Intel or Motorola bus
timing configurations. If the BTS pin is tied low, Intel timing will be selected; if tied high, Motorola
timing will be selected. All Motorola bus signals are listed in parenthesis (). See the timing diagrams in
the A.C. Electrical Characteristics for more details.
3.0 CONTROL REGISTERS
The operation of each framer within the DS21Q41B is configured via a set of seven registers. Typically,
the control registers are only accessed when the system is first powered up. Once the DS21Q41B has
been initialized, the control registers will only need to be accessed when there is a change in the system
configuration. There are two Receive Control Registers (RCR1 and RCR2), two Transmit Control
Registers (TCR1 and TCR2), and three Common Control Registers (CCR1, CCR2, and CCR3).
FS1
0
0
1
1
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FS0
0
1
0
1
FRAMER ACCESSED
#0
#1
#2
#3
DS21Q41B