AHA4540-EVB [ETC]

TPC EVALUATION BOARD; TPC评估板


型号：	AHA4540-EVB
厂家：	ETC
描述：	TPC EVALUATION BOARD TPC评估板 PC
文件：	总3页 (文件大小：204K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

comtech aha corporation

PRODUCT BRIEF

AHA4540 TPC EVB

TPC EVALUATION BOARD

INTRODUCTION

FEATURES

The AHA4540-EVB is an evaluation board that

can be integrated into a communications system for

evaluation of the AHA4540 Turbo Product Code

encoder/decoder device at real system speeds.

Alternatively, it can be connected to a Bit Error Rate

Tester (BERT) for evaluating the performance of the

AHA4540 with a user supplied communications

channel.

The evaluation board includes one AHA4540

device supporting full duplex encoding and

decoding of a serial data stream, I and Q symbol

data, or soft metrics using Turbo Product Codes.

The EVB supports standalone encoding or decoding

as well as full duplex simultaneous

encoding/decoding. The AHA4540 device is fully

programmable to cover a wide range of

configurations. All registers in the AHA4540

device are programmable and readable through an

RS-232 serial port connection to a PC.

Communication software is provided with the

evaluation board for configuration and control from

the host personal computer.

PPERFORMANCE:

• 148 MHz maximum clock input (S_UCLK,

S_CCLK)

• 148 Mbits/sec maximum serial data rate

• Simultaneous independent TPC encoding and

decoding

• Access to registers in the AHA4540 device

• Up to 4 bit soft decision input to TPC decoder

• On-board synchronization in the AHA4540

• On-board AHA4540 includes CRC insertion and

detection

INTERFACE:

• SMA connectors for all clock and data signals

on/off board

• 2 frequency synthesizers on board generate

payload side clocks at frequencies up to 60 MHz

• User can supply payload and channel side bit

clocks up to 148 MHz max frequency

• RS-232 control interface for board configuration

and monitoring

AHA4540 EVB also supports numerous self-

test modes that allow loop back tests at different

stages and BERT-like tests where the board

generates pseudo random test patterns.

GENERAL:

• PCB form factor (5.30” x 8.80”)

• On board LED status indicators

• Requires 5V power supply @ 2.0 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

This product is covered under multiple patents held or licensed by Comtech AHA

Corporation.

This product is covered by a Turbo Code Patent License from France Telecom -

TDF - Groupe des ecoles des telecommunications.

comtech aha corporation

FUNCTIONAL OVERVIEW

CONNECTORS

Data I/O

The AHA4540 simultaneously encodes and

decodes user provided data using Turbo Product

Codes (TPCs). User provided data is clocked into

the EVB serially using signals S-UCLK and

S_UDATA from coaxial SMA connectors, or with

parallel 8-bit transfers using USER_UDATA from

the parallel connector JP3 and ready/accept

handshake signals. In Figure 1, CPLD_1 contains

the multiplexor that selects either serial data with

clock, or parallel data from the USER_UDATA bus.

Control of this multiplexor is via the AHAESB

Windows software provided. The TPC encoder in

the AHA4540 device encodes the data, adds FEC

bits, then outputs the data to CPLD_3 where the

data gets serialized and transmitted to the channel

along with the clock, S_EDATA and S_ECLK, and

also driven out in 8-bit wide format to the

SMA connectors are used for Inputs and outputs

for all high speed serial clock and data interfaces.

The payload side SMA connectors may connect

directly to a BERT transmitter and receiver. The

channel side connections would normally be

through the parallel flat cable connectors. The

parallel connections for the three parallel ports other

than the USER_CDATA use 50 pin twisted pair flat

cables with every other conductor grounded.

Control Port

RS232 connection to the host PC is through a 9-

pin DC shell connector located on the back of the

board. Configuration and monitoring of the EVB

operation is done through this port. A pentium class

PC running Windows OS is required.

USER_EDATA bus on JP4.

Power

Once the data is output from the evalutation

board on either the serial or parallel encoded data

interfaces, it is transmitted through an external

channel where the data is corrupted by the addition

of noise resulting in data bit errors. This corrupted

data is clocked into the evaluation board serially

using S_CCLK and S_CDATA or using the

USER_CDATA 16-bit wide parallel input bus on

JP5.

5.0V Power is supplied by the user’s power

supply. Maximum current required is 2.0 Amps.

The S_CDATA signal is useful for wrapping

around hard decision channel data back into the

AHA4540 TPC decoder. For soft decision data the

16-bit parallel port must be used. The CDATA port

of the AHA4540 accepts up to 16-bits per clock

transfers of received channel data. This data may be

I,Q data or soft metrics. The chip can accept up to

four I,Q pairs or four soft metrics per transfer. In

serial streaming mode the received serial channel

data is deserialized into four soft metrics with the

lower 3 bits of each metric forced to zero in the

FPGA. The TPC decoder in the AHA4540 corrects

the data errors and outputs the corrected blocks

through CPLD_2 in both serialized clock and data

format, S_DDATA, S_DCLK, and parallel format

to the USER_DDATA bus on JP2.

comtech aha corporation

Figure 1: Block Diagram

CLK_SYNC

(SMA)

SERIAL

OUT

(SMA)

CPLD3

Serializer

Encoder

PLL

BERT

TRX

(SMA)

CPLD1

Deserializer

SERIAL

(SMA)

AHA4540

PAR

I/O

CPLD4

Deserializer

Encoder

AHA4540

Decoder

PAR

I/O

PAR

I/O

CPLD2

Serializer

UPI

BERT

REC

(SMA)

FPGA

PC I/O

RS232

Decoder

PLL

AHA4540 - EVB

Correction and Lossless Data Compression

USER INTERFACE SOFTWARE

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.

Configuration of the board is through the

Windows Graphic User Interface software included

with the evaluation board. The software allows the

user to configure the encoder and decoder

operations in terms of type of TPC codes used,

synchronization word, framing, and other control

parameters. The software also allows the user to

monitor the evaluation board for error correcting

status information via the RS232 port connection.

ORDERING INFORMATION

PART NUMBER

AHA4540-EVB

DESCRIPTION

AHA4540 Evaluation Board

LOOP BACK TEST MODES

Built in loop back modes are provided that

internally connect the encoded output data to the

decoder input interface.This loop back testing

allows on-board BERT testing with random data

pattern generation.

ABOUT AHA

comtech aha corporation

A subsidiary of Comtech Telecommunications Corporation

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

1126 Alturas Drive

tel: 208.892.5600

Moscow, ID 83843-8331

fax: 208.892.5601

e-mail: sales@aha.com

www.aha.com

PB4540evb_1006

AHA4540-EVB [ETC]

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