cx29503 Mindspeed Technologies, cx29503 Datasheet - Page 70

• Manufacturer Part Number: cx29503
• Description: Cx29503 Broadband Access Multiplexer Data Sheet
• Manufacturer: Mindspeed Technologies

Functional Description
2-22
Loopback Functionality:
Overhead Handler:
Shallow Line Loopback—The entire line side receiver DS3/E3 data stream (before
the line decoder) is looped back to the transmitter.
Remote Line Loopback—The entire line side receiver DS3/E3 data stream (after
the line decoder) is looped back to the transmitter.
Source Loopback—The system-side transmitter data is looped back to the
receiver.
Supports full-duplex HDLC operation for 28.2 Kbps TDL in DS3 C-Parity frame
format, 22.375 Kbps N-bit in E3 G.751 frame format
Far-End Alarm Control (FEAC) handler
Supports transmitting and receiving of Application Identification Channel (AIC)
messages in DS3 C-parity and DS3-M13 frame format
Transmit FIFO provides message transmitted status and FIFO underrun, empty,
Repetitive code word mode—interrupt is generated on every 10 repetitive code
A separate 128-byte FIFO is used in transmitting and receiving directions to
buffer the message
Each FIFO is capable of holding multiple messages
The Receiver FIFO near-full threshold can be configured in single byte
granularity
The Transmit FIFO near-empty threshold can be configured in single byte
granularity
The Receive FIFO provides message received status and FIFO near full and
overrun status
near empty and full status
Maskable interrupts are available for the transmitter FIFO near-empty, FIFO
underrun, message transmitted event and receiver FIFO near-full, and FIFO
overrun and message received event
Programmable code word transmission operates in single and repetitive code
word mode
Single code word mode—interrupt is generated on each 16-bit code word
transmits (1.7 ms)
word transmits
Code word detection supports single and 9 out of 10 repetitions modes; under
the worst-case condition, buffer overrun occurs in 1.7 ms for single detection
or 17 ms for the repetitive detection mode
A 3-byte deep FEAC stack is also provided for holding the detected code
words; the worst-case takes approximately 68 ms to cause the stack overrun in
9 out of 10 repetitive detection modes.
Mindspeed Technologies™
Preliminary Information
CX29503 Data Sheet
29503-DSH-002-B