tp3401 National Semiconductor Corporation, tp3401 Datasheet - Page 6

• Manufacturer Part Number: tp3401
• Description: Dasl Digital Adapter For Subscriber Loops
• Manufacturer: National Semiconductor Corporation

Timing Diagrams
Note 1 Receive data active
Note 2 After the device is in sync
Note 3 In Master mode only
Note 4 C7 is the first bit clocked in and out of the device
Bit
C7
C6
C5
C4
C3
C2
C1
C0
State
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
Master Mode
Slave Mode
Deactivate and Power Down
Power Up and Activate
Normal Through Connection
Loopback to Digital Interface
Normal Through Connection
Loopback B1
Normal Through Connection
Loopback B1 Only to Line (Note 1)
Normal Through Connection
Loopback B2 Only to Line (Note 1)
DCLK DEN pin
DCLK DEN pin
B1 B2 Channels Direct
B1 B2 Channels Exchanged
Control Register Function
FIGURE 6 B Channel Interface Timing Master Mode
TABLE II Control and Status Register Functions
a
B2
e
e
a
16 kHz Clock
D Channel Enable (Note 3)
D to Line (Note 1)
6
Read Back C7 from Control Register
Read Back C7 from Control Register
Read Back C6 from Control Register
Read Back C6 from Control Register
Read Back C5 from Control Register
Read Back C5 from Control Register
Read Back C4 from Control Register
Read Back C4 from Control Register
Read Back C3 from Control Register
Read Back C3 from Control Register
No Error
Bipolar Violation Since Last READ (Note 2)
Out-Of-Sync
Loop In-Sync and Activation Complete
No Line Signal at Receiver Input
Line Signal Present at Receiver Input
Status Register Function
TL H 9264 – 6