RS8953 Conexant Systems, Inc., RS8953 Datasheet - Page 138

• Manufacturer Part Number: RS8953
• Description: High-bit-rate Digital Subscriber Line (hdsl) Channel unit
• Manufacturer: Conexant Systems, Inc.

4.0 Registers
4.16 PRA Transmit Write
SA8_MODE
E_MODE
PRA_EN
SYNCHR_EN
CRC4_MODE
A_MODE
4-70
0x71—PRA Transmit Control Register 1 (TX_PRA_CTRL1)
—
7
RESET_E_CNT
Controls the behavior of Sa8 bits, transmitted towards the HDSL link, as follows:
Controls the behavior of the E-bits transmitted towards the HDSL link, as follows:
also in RX_PRA_MON0), as follows:
NOTE:
Enable or globally disable the receive PRA circuitry, as follows:
Enable or disable the PCM multiframe synchronization state machine, as follows:
Controls the behavior of the CRC bits, transmitted towards the HDSL link, as follows:
Controls the behavior of A-bits, transmitted towards the HDSL link, as follows:
The Automatic mode operates in conjunction with the receiver CRC4 check result (reported
6
The value of this register takes effect starting with the next PCM multiframe
following the write access cycle completion.
AIS
5
0 = Transparent
1 = From bits buffer 1
0 = Disable ALL RX PRA functionality
1 = Enable ALL RX PRA functionality
0 = Enable. Use TMSYNC input pin as a qualifier of the frame and force
synchronization state machine to HUNT mode.
1 = Disable. Use TMSYNC input as a qualifier of multiframe.
0 = Transparent
1 = From bits buffer 0
Receiver CRC Check
Code
Code
00
01
10
11
00
01
10
11
A_MODE
Error
OK
4
Conexant
3
CRC4_MODE[1:0]
From bits buffer 0
Re-calculated
Transparent
Transparent
CRC4 Bits
Automatic
E-bits Forced to
All ‘1’s
Illegal
Illegal
E-bits
0
1
2
SYNCHR_EN
RS8953B/8953SPB
1
HDSL Channel Unit
N8953BDSB
PRA_EN
0