DS2151QNB+ Maxim Integrated, DS2151QNB+ Datasheet - Page 36

• Manufacturer Part Number: DS2151QNB+
• Description: Network Controller & Processor ICs
• Manufacturer: Maxim Integrated

Specifications of DS2151QNB+

• Product: Framer
• Number Of Transceivers: 1
• Data Rate: 2.048 Mbps
• Supply Current (max): 65 mA
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• Package / Case: PLCC-44
• Minimum Operating Temperature: - 40 C
• Operating Supply Voltage: 5 V
• Supply Voltage - Max: 5.25 V
• Supply Voltage - Min: 4.75 V
• Part # Aliases: 90-2151Q+NB0

10 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 diagrams in
Section
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
14
CH24
CH24
CH1
CH1
for an example.
CH15
CH23
CH7
CH15
CH23
CH7
CH14
CH22
CH6
CH14
CH22
CH6
POSITION
POSITION
RCBR3.7
RCBR1.0
TCBR3.7
TCBR1.0
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
CH4
CH12
CH20
CH4
36 of 60
CH11
CH19
CH11
CH19
CH3
CH3
CH10
CH18
CH10
CH18
CH2
CH2
(LSB)
CH17
(LSB)
CH17
CH1
CH9
CH1
CH9
RCBR2 (6D)
RCBR1 (6C)
RCBR3 (6E)
TCBR1 (32)
TCBR2 (33)
TCBR3 (34)