DS21Q41BTN Dallas Semiconducotr, DS21Q41BTN Datasheet - Page 38

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

Each of the bit positions in the Transmit Idle Registers (TIR1/TIR2/TIR3) represent a DS0 channel in the
outgoing frame. When these bits are set to a 1, the corresponding channel will transmit the Idle Code
contained in the Transmit Idle Definition Register (TIDR). Robbed bit signaling and Bit 7 stuffing will
occur over the programmed Idle Code unless the DS0 channel is made transparent by the Transmit
Transparency Registers.
9.0 CLOCK BLOCKING REGISTERS
The Receive Channel Blocking Registers (RCBR1/RCBR2/RCBR3) and the Transmit Channel Blocking
Registers (TCBR1/TCBR2/TCBR3) control the RCHBLK and TCHBLK pins respectively. The
RCHBLK and TCHCLK pins are user-programmable outputs that can be forced either high or low during
individual channels. These outputs can be used to block clocks to a USART or LAPD controller in
Fractional T1 or ISDN-PRI applications. When the appropriate bits are set to a 1, the RCHBLK and
TCHCLK pins will be held high during the entire corresponding channel time. See the timing in Section
12 for an example.
RCBR1/RCBR2/RCBR3:
RECEIVE CHANNEL BLOCKING REGISTERS (Address=6C to 6E Hex)
TCBR1/TCBR2/TCBR3:
TRANSMIT CHANNEL BLOCKING REGISTERS (Address=32 to 34 Hex)
(MSB)
(MSB)
CH16
CH24
CH16
CH24
CH8
CH8
SYMBOL
SYMBOL
CH24
CH24
CH1
CH1
CH15
CH23
CH15
CH23
CH7
CH7
POSITION
POSITION
RCBR3.7
RCBR1.0
TCBR3.7
TCBR1.0
CH14
CH22
CH14
CH22
CH6
CH6
CH13
CH21
CH13
CH21
CH5
CH5
NAME AND DESCRIPTION
Receive Channel Blocking Registers.
0=force the RCHBLK pin to remain low during this channel time
1=force the RCHBLK pin high during this channel time
NAME AND DESCRIPTION
Transmit Channel Blocking Registers.
0=force the TCHBLK pin to remain low during this channel time
1=force the TCHBLK pin high during this channel time
CH12
CH20
CH12
CH20
CH4
CH4
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CH11
CH19
CH11
CH19
CH3
CH3
CH10
CH18
CH10
CH18
CH2
CH2
CH17
CH17
CH1
CH9
CH1
CH9
(LSB)
(LSB)
RCBR1 (6C)
RCBR2 (6D)
RCBR3 (6E)
TCBR1 (32)
TCBR2 (33)
TCBR3 (34)
DS21Q41B