*This product is covered under multiple patents held or licensed by Comtech AHA
Corp.
This product is covered by a Turbo Code Patent License from France Telecom -
TDF - Groupe des ecoles des telecommunications.
comtech aha corporation
comtech aha corporation
PRODUCT BRIEF*
AHA4524 TPC EVB
TURBO PRODUCT CODE EVALUATION BOARD
The AHA4524-EVB is a hardware evaluation
board that allows incorporation of the AHA4524
Turbo Product Code (TPC) device in a prototype
communications system or laboratory test
environment. It can be used to demonstrate the
forward error correction (FEC) performance gain
that TPCs offer over other available solutions. The
EVB supports simultaneous encoding and decoding
of a serial data stream with rates up to 31 Mbits/sec.
The board can be programmed and configured via a
RS-232 interface connected to a PC running the
included configuration software to support a wide
variety of code configurations.
The AHA4524-EVB can be interfaced with a
standard Bit Error Rate Tester (BERT) for data
source and data sink or other communications
hardware incorporated on the uncoded side of the
EVB. On the channel side of the EVB, coded data is
output from the encoder to be connected to a modem
or other hardware channel model and then input
back into the EVB after demodulation.
The AHA4524 device is a single-chip Turbo
Product Code (TPC) Forward Error Correction
(FEC) Encoder/Decoder. This device integrates
independent TPC encoder and decoder functions,
and can be configured for full or half duplex
operation. In addition to TPC coding, the device
includes helical interleaving, CRC computation and
detection, and pseudo random bit stream
scrambling. Each of these functional blocks can be
independently bypassed. When connected with a
PC for configuration via the RS-232 interface the
AHA4524-EVB is fully programmable for a wide
range of coding configurations and allows all
registers in the AHA4524 device to be accessed for
configuration.
FEATURES
PERFORMANCE:
31 MHz maximum clock input (U_CLK,
C_CLK)
31 Mbits/sec maximum serial data rate
Simultaneous independent TPC encoding and
decoding
Access to registers in the AHA4524 device
Up to 4 bit soft decision input to TPC decoder
On-board synchronization
On-board AHA4524 includes CRC insertion and
detection
INTERFACE:
SMA connectors for all clock and data signals
on/off board
Frequency locked loop generates payload side
clock sync signal
Decoder input clock is supplied by the channel
data side or use on-board 31 MHz oscillator
RS-232 control interface for board configuration
(optional)
Dip Switch selectable operating modes
GENERAL:
PCB form factor (191 mm x 76 mm)
On board LED status indicators
Requires 5V power supply @ 2.5 A
Requires Windows PC for configuration control
via RS-232 port
SMA connectors are used for inputs and outputs
for all high speed serial interfaces
Footprint compatible as a daughter board for
Texas Instruments DSKs
Figure 1:
AHA4524-EVB
comtech aha corporation
PB4524EVB_0203
2005 Comtech AHA Corp.
comtech aha corporation
1126 Alturas Drive
fax: 208.892.5601
tel: 208.892.5600
e-mail: sales@aha.com
www.aha.com
Moscow, ID 83843-8331
A subsidiary of Comtech Telecommunications Corporation
Figure 2:
Block Diagram
FUNCTIONAL OVERVIEW
The AHA4524-EVB can be interfaced to a
standard Bit Error Rate Tester (BERT) or other user-
supplied hardware for data source and sink. The
serial input data is TPC encoded and then
transmitted out of the EVB through the SMA
connectors along with an output clock. The encoded
data can then be passed through a modulator, user
channel, and demodulator before being input back
into the EVB for TPC decoding. Data input to the
decoder is supplied as a serial data stream of up to 4
bits per input soft metric along with a channel rate
clock. The serial data stream is TPC decoded and
output from the EVB with an output clock.
The user can control the configuration of the
AHA4524 encoder and decoder from an external
PC running in the Windows environment connected
via the serial port. A wide range of coding choices
are supported with all of the registers in the
AHA4524 device accessible to the user. On board
LEDs are provided to indicate status of coding
operation during operation.
Built in loop back modes are provided that
internally connect the encoded output data to the
decoder input interface for test and monitoring
purposes. A pass through mode is also supported in
the EVB to facilitate ease of integration of the EVB
into a user system.
The AHA4524-EVB is compatible for
interfacing with the Texas Instruments TI C5402
DSK evaluation board. The user can develop
firmware for configuration and control of the
AHA4524-EVB board via the DSP serial data
stream using the TI DSK.
ORDERING INFORMATION
ABOUT AHA
Comtech AHA Corporation (AHA) develops
and markets superior integrated circuits, boards,
and intellectual property core technology for
communications systems architects worldwide.
AHA has been setting the standard in Forward Error
Correction and Lossless Data Compression
technology for many years and provides flexible,
cost-effective solutions for today's growing
bandwidth and reliability challenges. Comtech
AHA Corporation is a wholly owned subsidiary of
Comtech Telecommuncations Corp. (NASDAQ:
CMTL). For more information, visit www.aha.com.
AHA4524
Encoder
FPGAu
AHA4524
Decoder
FPGAd
FPGAe
FPGAc
DSPd
DSPe
System
Channel
AHA4524 EVB
Optional TI DSK
Data
Source
Data
Sink
PART NUMBER
DESCRIPTION
AHA4524-EVB
AHA4524 TPC Encoder /
Decoder Evaluation Board
PDF 
ZIP