ATDSK1118

USER MANUAL

ATE Communications Limited

Unit 9 Technology Drive,

Beeston,

Nottingham,

NG9 2ND.

Tel [phone]

Fax [phone]

e-mail: [e-mail]

web site: www.ate.co.uk

Contents

1.0 Introduction	3
2.0 Product Features	4
3.0 Functional Description	5
3.1 EZ USB FX USB Microcontroller	6
3.2 16-Bit Stereo Audio Codec	6
3.3 Analogue-to-Digital Converters	6
3.4 Digital-to-Analogue Converters	6
3.5 Other Features	6
4.0 Board Configuration	7
4.1 Power Supply	7
4.2 USB Configuration	7
4.3 Audio Input Biasing	8
4.4 A/D Sampling Frequency	8
5.0 Specification	9

1.0 Introduction

The ATDSK1118 is a combined signal acquisition and generation board and USB interface to the DSP on a C6711™ DSK. Signal acquisition and generation is handled by a stereo audio CODEC and high frequency digital-to-analogue and analogue-to-digital converters. The USB interface is handled by Cypress Semiconductors' versatile combination USB interface and 8051 Microcontroller chip, the EZ-USB FX. The USB interface is fully compliant with the USB 1.1 specification and is capable of functioning as a full speed device offering transfer rates to the DSP on the DSK of up to 12 Mbits per second.

The manual gives a general description of the board, explaining the main on-board devices and all the user interfaces. The manual also shows all possible board configurations and includes a detailed specification of the ATDSK1118 Board.

2.0 Product Connectors

The features of the ATDSK1118 are detailed below:

• Daughter Board Connectors [J2, J11]

The Daughter Board Connectors allow the ATDSK1118 to be used in conjunction with DSP Based Products. They contain Clocks, Resets, Device Read Write Signals, A Serial Port and a 32-Bit EMIF data bus.

• USB Port [J1]

The USB port is the physical interface to the PC. Connect a standard USB cable to this port and to a PC to provide a physical connection to the PC.

• Stereo Input Jack [J7]

Stereo analogue signals are fed from this connector to the on-board CODEC. The signals fed via this connector should be at line level (2 Vrms).

• Stereo Output Jack [J5]

Stereo analogue signals from the on-board CODEC are fed to this connector. The signals provided by this connector will be at line level (2 Vrms).

• Analogue Input Connectors [J4, J6]

High-speed analogue signals are fed from these connectors to the on-board analogue-to-digital converters that are mapped onto the EMIF data bus. The signals fed via this connector may have amplitudes up to +5V.

• Analogue Output Connectors [J8, J10]

High-speed analogue signals from the digital-to-analogue converters are fed to these connectors. The digital-to-analogue converter is mapped onto the EMIF data bus.

3.0 Functional Overview

The block diagram below shows all the features of the ATDSK1118 board. The boards various connectors can be seen around the edge of the diagram.

The ATDSK1118 is primarily designed for use with a C6711™ DSK (DSP Starter Kit) as supplied by Texas Instruments. It can however be used with any host board that offers the required resources.

3.1 EZ-USB FX USB Interface Device

The EZ-USB FX Device provides the necessary functionality for the board to successfully interface to a USB master. The EZ-USB FX contains circuitry for communicating with a USB master using the USB protocol and electrical signal specification and is able to function as a full speed device providing theoretical data transfer rates of up to 12 Mbits per second.

To provide a flexible solution to USB system implementations, the EZ-USB FX also includes an 8051 Microcontroller. The Microcontroller can be used to coordinate the flow of data between the USB port and a number of external communication ports.

Two external 8 bit parallel ports on the EZ-USB are connected to the DSP's EMIF and can be used to move data between the USB chip and the DSP. This in turn allows the programmer to move data between the DSP and an application running on the PC via the USB bus.

1. 16-Bit Stereo Audio Codec

The board provides two stereo jacks, one for audio input and one for audio output. The stereo audio input to the ATDSK1118 is coded into a serial format by the CS4218 codec. The stereo audio output from the ATDSK1118 is decoded from a serial format by the CS4218 codec. The particular serial format that is utilised is referred to as SM3 in the CS4218 datasheet. The serial interface of the CS4218 codec is available at one of the ATDSK1118's host connectors. When the ATDSK1118 is docked onto a C6711™ DSK, the serial interface to the CS4218 codec is directly connected to McBSP1. The audio codec can be reset by the host board or by the ATDSK1118's on-board reset switch.

2. Analogue-to-Digital Converters

The ATDSK1118 has two 12-Bit, high performance analogue-to-digital converters (ADCs). The two analogue input connectors accept an input voltage range of 0 to +5 Volts. There is a choice of five different clock sources for use with the ADCs. Three are divisions of the on-board oscillator frequency and two are external signals from one of the ATDSK1118's host connectors. The chosen sample frequency is selected by soldering the appropriate combination of links to the ATDSK1118. The ATDSK1118 will be have the links configured at the factory such that the clock for the ADCs is provided by an external signal from one of the ATDSK1118's host connectors. When the ATDSK1118 is docked onto a C6711™ DSK, these factory settings cause TOUT0 to be the source of the ADCs clocks.

3.4 Digital-to-Analogue Converters

There are two 16-Bit, high-speed digital-to-analogue converters (DACs) on the daughter card. These output a voltage range of 0-5Volts to two analogue connectors.

When the ATDSK1118 is docked onto a C6711™ DSK, both the ADCs and the DACs are mapped to the host DSP's External Memory Interface (EMIF). This allows the DSP access to read the data from the ADC and allows it to write data to the DAC.

3.5 Other Features

The ATDSK1118 features two LEDs. The first (LED1) indicates that power has been supplied to the board. The second (LED2) indicates that board has been connected to a USB hub. The boards momentary reset switch (SW1) is used to reset the USB μC and the Stereo Audio Codec.

4.0 Board Configuration

The ATDSK1116 can be configures in the following ways:

4.1 Power Supply

The ATDSK1118 requires the DSK board to be powered using J8. This provides the ATDSK1118 with +12V and -12V as well as the standard +5V.

Warning: Do not supply power to J4 and J8 at the same time.

When power is supplied to the ATDSK1118 the Green LED (LED1) will illuminate.

4.2 USB Configuration

The EZ-USB FX used various signals to interface with the DSP.

4.2.1 Control Signals:

The following signals in combination with some control bits in the USB 8051 determine how the internal FIFOs on the USB chip are accessed from the DSP. The FIFO select signal is connected to the DSP CE2 signal and the Output Enable signals are connected to the DSP's RE signals. The board can be configured to route the CE2 from the DSP to either one or both of the FIFO select signals, the board can also be configured to route the RE signal to either one or both of the output enable signals.

The select signal's usage changes depending on the internal configuration of the USB chip's Microcontroller. When the Microcontroller is configured in double byte mode, the select signal which FIFO data is read from. When the Microcontroller is in single byte mode, the select signal is used to enable reading from or writing to a specific FIFO.

The following table shows the different configurations when using the FIFOs in double byte mode:

Select signal config	Output enable signal config	Result
A select connected, B select not connected	A and B output enables connected	Reads and writes access only FIFO A, data is output on a 16 bit wide bus (two bytes for every read or write)
B select connected, A select not connected	A and B output enables connected	Reads and writes access only FIFO B, data is output on a 16 bit wide bus (two bytes for every read or write)
All other configurations	All other configurations	Should not be used

The following table shows the possible configurations when using single byte mode:

The following table shows the possible configurations when using single byte mode
R17 (ASEL)	R25 (BSEL)	R18 (AOE)	R19 (BOE)	Configuration
N.F.	N.F.	N.F.	N.F.	Should not be used
N.F.	0Ω	N.F.	0Ω	When doing reads/writes from the USB chip, data lines 0 to 7 on the EMIF are driven by the USB chip with data coming from FIFO B in the USB chip
0Ω	N.F.	0Ω	N.F.	When doing reads/writes from the USB chip, data lines 8 to 15 on the EMIF are driven by the USB chip with data coming from FIFO A in the USB chip
0Ω	0Ω	0Ω	0Ω	When doing reads/writes from the USB chip, data lines 0 to 15 on the EMIF are driven by the USB chip, data lines 0 to 7 are driven with data coming from FIFO B and data lines 8 to 15 are driven with data coming from FIFO A in the USB chip.

4.2.2 Flags:

The hardware can be configured to connect the different output flags from the USB chip to the DSP. The following table shows which flags are routed to the timer inputs on the DSP.

A/B Input Flag - Timer Input 1				A/B Output Flag - Timer Input 0
R24	R14	Input FIFO Flag		R13	R15	Output FIFO Flag
0Ω	N.F.	A		0Ω	N.F.	A
N.F.	0Ω	B		N.F.	0Ω	B

4.3 Audio Input Biasing

The Audio Inputs can be biased to the following levels:

Left Audio Input				Right Audio Input
R46	R47	Level		R83	R73	Level
N.F.	N.F.	-		N.F.	N.F.	-
10KΩ	N.F.	0V		10KΩ	N.F.	0V
N.F.	10KΩ	5V		N.F.	10KΩ	5V
10KΩ	10KΩ	2.5V		10KΩ	10KΩ	2.5V

4.4 A/D Sampling Frequency

The A/D sampling frequency can be selected from five available clocks. The desired clock can be enabled by fitting a single link in one of the five available positions.

A/D Sampling Frequency
Link Fitted	Clock Source
R51	CLK/2^†
R52	CLK/4^†
R53	CLK/8^†
R55^§	Host clock 1
R12	Host clock 2

Notes: ^†CLK = 12.288MHz

^§Default Link Position

5.0 Specification

USB Interface:

• USB port for connection to USB master/hub

• Programmable 8051 microcontroller

• External ports connected to DSP's EMIF

Analogue Interface:

• Two 0-5Volt High-impedance analogue inputs

• Two variable output analogue outputs

• One stereo line level input

• One stereo line level output

Digital Interface:

• Two Samtec SFM Series 0.050” × 0.050” pitch sockets

• 32 Bit digital data bus for A/D & D/A converters

• Serial data bus for CS4218 codec

• 5V level digital outputs

• 3.3V level digital inputs (5V tolerant)

User Interface:

• Two LEDs

• One momentary reset switch for EZ-USB FX and CS4218 Codec.

CS4218 Stereo Audio Codec:

• 64x Over sampling

• Input anti-aliasing and output smoothing filters

• Programmable input gain

• Sample frequencies from 4 kHz to 50 kHz

AD768 Digital-to-analogue Converter:

• 16 Bit resolution

• 20 MSPS update rate

AD9220 Analogue-to-digital Converter:

• 12 Bit resolution

• 10 MSPS update rate

Power Requirements:

• +5V, 0V, -12V, +12V

• DSK powered using connector J8

Physical Dimensions:

• 105mm × 86mm

ATDSK1118 USER MANUAL

©2002 ATE COMMUNICATIONS LTD

PAGE 9 OF 11

USB PORT (J1)

EZ-USB FX

USB μC

ED[15:0]

CE

ED[15:0]

ED[31:16]

ED[31:16]

ED[15:0]

CLOCK

DIVIDER

J2

J11

OE

WE

2 EXTERNAL CLOCK INPUTS

ANALOGUE

OUTPUT (J10)

ANALOGUE

OUTPUT (J8)

ANALOGUE

INPUT (J4)

SEL

FLAGS

ANALOGUE

INPUT (J6)

AUDIO

OUTPUT (J5)

AUDIO

INPUT (J7)

CLOCK

SELECT

AD768

DAC

AD768

DAC

AD9220

ADC

AD9220

ADC

HOST RESET

RESET SWITCH

Serial Bus

12.288 MHz

CLOCK

CS4218

CODEC

EMIF

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