USB JTAGScan - Sample Project

Page 1
USB JTAGScan - Sample Project
Overview
This sample project demonstrates using FTDI’s FT2232C I.C. device Multi-Protocol Synchronous Serial
Engine ( MPSSE ) controller to do JTAG routines for scanning in, scanning out, scanning in and out, and
getting the data. The executable application and full project code ( in Delphi ) are provided.
The project code only demonstrates using 32 bits, but can be extended up to 64 KByte. The GetData routine
in the example shows how to collect data. For this type of application the FT2232C’s read buffer latency
timer should be left set to 16 ms ( the default value ). The routines in this project use the Send Immediate
command to send any outstanding data.
Requirements
This project is designed to run on Windows 2000 or Windows XP PC, and requires FTDI’s FT2232C drivers
to be installed.
Figure 1 - Interfacing the FT2232C to a Texas Instruments SN74BCT8244A JTAG Scan / Test device.
USB "B"
Connector
Ferrite Bead
1
27R
2
3
3
6
10nF
33nF
14 31
42
V
C
C
27R
4
5
470R
VCC
V
C
C
V
C
C
I
O
A
3v3OUT
A
V
C
C
V
C
C
I
O
A
7
1.5K
13
TDI/DO
23
(ADBUS1)
2
USB DM
TDO/DI 22
(ADBUS2)
3
USB DP
TMS/CS 21
(ADBUS3)
4
FT2232C
5
RSTOUT#
43 XTIN
6MHz
44 XTOUT
VCC
27pF
27pF
10K
VCC
+
0.1uF
0.1uF
10uF
Decoupling Capacitors
FT2232C-Proj03 USB JTAGScan - Sample Project
4
RESET#
48
EECS
1
EESK
2
EEDATA
47
Vcc
TCK/SK 24
(ADBUS0)
47pF
8
0.1uF
46
TEST
A
G
N
D
45
G
N
D
G
N
D
9
TCK
SN74BCT8244A
TDO
2OE#
TMS
GND
23 1A1
GPIOL2
(ADBUS5)
19
22
GPIOL3
(ADBUS6)
17
21 1A3
GPIOL4
(ADBUS7)
16
20 1A4
19
GPIOH2
(ACBUS1)
13
17
GPIOH3
(ACBUS2) 12
16
GPIOH4
(ACBUS3)
G G
N N
D D
18 25
11
15
1OE#
TDI
GPIOL1
20
(ADBUS4)
GPIOH1
(ACBUS0) 15
VCC
18
1
24
6
1A2
2A1
2A2
2A3
2A4
34
© Future Technology Devices International Ltd. 2004
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Running the Sample Application
Run JTAGScan.exe. The following dialogue window will be shown. Use the Device name drop down menu
to select the MPSSE device that you want to talk to. This application is designed to be run with a Texas
Instruments SN74BCT8244A JTAG Scan / Test device, but the source code could be modified to allow it to
be used with almost any JTAG device. Obviously, the hardware configuration, and thus the application will
vary depending on which device the FT2232C is being interfaced with.
Figure 2 - JTAGScan sample application
FT2232C-Proj03 USB JTAGScan - Sample Project
© Future Technology Devices International Ltd. 2004
Page 3
Related Documentation
FT2232C Device Datasheet
AN2232C-01 - Command Processor For MPSSE and MCU Host Bus Emulation
AN2232C-02 - Bit Mode Functions for the FT2232C
AN232B-04 - Data Throughput, Latency, and Handshaking**
Texas Instruments sn74bct8244a - SN54BCT8244A / SN74BCT8244A Scan Test Device With Octal
Buffers - Device Datasheet
Related Projects
FT2232C-Proj01 USB to SPI Interface
2
FT2232C-Proj02 - USB to I C Interface
**Note - The application note refers to FTDI’s FT232BM and FT245BM devices, but much of the infomation still applies to the FT2232C
FT2232C-Proj03 USB JTAGScan - Sample Project
© Future Technology Devices International Ltd. 2004
Page 4
Document Revision History
FT2232C-Proj03 Version 1.0 – Initial document created July 2004.
FT2232C-Proj03 Version 1.1 – October 2004.
Schematic added.
Reference to SPITest.exe corrected - changed to JTAGScan.exe
Reference to Texas Instruments Datasheet added.
Disclaimer
© Future Technology Devices International Limited , 2002 - 2004
Neither the whole nor any part of the information contained in, or the product described in this manual, may be
adapted or reproduced in any material or electronic form without the prior written consent of the copyright holder.
This product and its documentation are supplied on an as-is basis and no warranty as to their suitability for any
particular purpose is either made or implied.
Future Technology Devices International Ltd. will not accept any claim for damages howsoever arising as a result of
use or failure of this product. Your statutory rights are not affected.
This product or any variant of it is not intended for use in any medical appliance, device or system in which the failure
of the product might reasonably be expected to result in personal injury.
This document provides preliminary information that may be subject to change without notice.
Contact Information
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373 Scotland Street,
Glasgow G5 8QB,
United Kingdom.
Tel : +44 ( 0 )141 429 2777
Fax : +44 ( 0 )141 429 2758
E-Mail ( Sales ) : sales1@ftdichip.com
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Please visit the Sales Network page of the FTDI Web site for the contact details our distributor(s) in your country.
FT2232C-Proj03 USB JTAGScan - Sample Project
© Future Technology Devices International Ltd. 2004