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USB MCU Host Emulator – Sample Project
USB AT-Bus Interface
Overview
This is an example project that demonstrates using the FT2232C’s Multi-Protocol Synchronous Serial
Engine (MPSSE) controller to perform MCU host bus controlling of an AT-Bus. The executable application
and the full project code (in Delphi) are provided.
Requirements
This project is designed to run on Windows 2000 or Windows XP and requires FT2232C drivers to be installed.
FT2232C-Proj04 USB MCU Host Emulator - Sample Project
© Future Technology Devices International Ltd. 2004
Page 2
Example Schematic
The schematic shown is an example of the design tested with the application provided.
USB "B"
Connector
Ferrite Bead
1
27R
2
3
4
5
470R
VCC
3
42
V
C
C
27R
6
10nF
14 31
V
C
C
V
C
C
I
O
A
3v3OUT
33nF
7
A
V
C
C
V
C
C
I
O
A
AD0
24
(ADBUS0)
3
AD1
23
(ADBUS1)
4
USB DM
AD2
22
(ADBUS2)
7
6
USB DP
AD3
21
(ADBUS3)
8
9
AD4
20
(ADBUS4)
13
12
AD5
19
(ADBUS5)
14
15
AD6
(ADBUS6) 17
17
16
AD7
16
(ADBUS7)
18
19
1.5K
FT2232C
5
RSTOUT#
43 XTIN
6MHz
44 XTOUT
VCC
27pF
27pF
10K
4
0.1uF
46
47pF
8
ALE
29
(BCBUS1)
RESET#
ALE 11
ENABLE
48
EECS
1
EESK
2
EEDATA
47
Data 7
Data 6
Data 5
Data 4
Data 3
Data 2
Data 1
Data 0
1
TEST
10uF
Decoupling Capacitors
ADDR 5
ADDR 6
ADDR 7
10
ADDR 11
I/O0
15
(ACBUS0)
AD12
36
(BDBUS4)
ADDR 12
I/O1
13
(ACBUS0)
AD13
35
(BDBUS5)
ADDR 13
IORDY
12 (ACBUS2)
AD14
33
(BDBUS6)
ADDR 14
AD15
(BDBUS7) 32
ADDR 15
45
G
N
D
9
G
N
D
G
N
D
18 25
G
N
D
A29
A28
A27
A26
A25
A24
0.1uF
ADDR 10
A
G
N
D
A30
20
AD11
37
(BDBUS3)
A11
A23
A22
A21
A20
A19
A18
A17
A16
CS#
RD#
(BCBUS2) 28
RD#
WR#
27
(BCBUS3)
WR#
OSC
11
(ACBUS3)
A31
VCC
AD10
38
(BDBUS2)
VCC
+
ADDR 4
ADDR 9
CS#
(BCBUS0) 30
0.1uF
ADDR 3
AD9
39
(BDBUS1)
LED
0.1uF
ADDR 2
ADDR 8
10k
IORDY
ADDR 1
5
AD8
40
(BDBUS0)
470R
LED
74LS373
ALE
VCC
470R
ADDR 0
2
A2
A3
A4
A5
A6
A7
A8
A9
B14
B13
OSC
34
AT BUS
Connector
FT2232C-Proj04 USB MCU Host Emulator - Sample Project
© Future Technology Devices International Ltd. 2004
Page 3
Running the Sample Application
Run HostEmul.exe. The following dialogue window will be shown.
The top left drop down menu allows you to select the device you want to open.
In this example device DLP-2232M A was connected.
The OPEN and CLOSE buttons open and close the port.
Read Controls
Address High are address bits A15 to A8.
Address Low are address bits A7 to A0.
Read will read the address (uses A7 to A0) and the data is displayed in the log window.
Read Extended will read the address (uses A15 to A0) and the data is displayed in the log window.
Write Controls
Address High are address bits A15 to A8.
Address Low are address bits A7 to A0.
Write will write the data in the data box to the address selected (uses A7 to A0).
Write Extended write the data in the data box to the address selected (uses A15-A0).
General I/O Bits
There are two General I/O bits – 0 and 1.
These are defaulted as inputs but can be set as outputs using the 0 Out and 1 Out boxes. The Set High bow
sets the IO to logic one. This can be used to toggle the LEDs.
Wait Controls
Allows you to queue commands on the IO before triggering on a transition caused by fitting / removing a
jumper link
FT2232C-Proj04 USB MCU Host Emulator - Sample Project
© Future Technology Devices International Ltd. 2004
Page 4
Further Information
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**
sn74ls373.pdf - Texas instruments SNLS373 Device Data Sheet
Related Projects
FT2232C-Proj01-USB to SPI Interface
FT2232C-Proj02-USB to I2C Interface
FT2232C-Proj03-USB to JTAG interface
**Note – The application note refers to the FTDI’s FT232BM and FT245BM devices, but much of the information still applies to the FT2232C.
FT2232C-Proj04 USB MCU Host Emulator - Sample Project
© Future Technology Devices International Ltd. 2004
Page 5
Document Revision History
FT2232C-Proj04 Version 1.0 – Initial document created November 2004.
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
Future Technology Devices International Limited
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
E-Mail ( Support ) : support1@ftdichip.com
E-Mail ( General Enquiries ) : admin1@ftdichip.com
Web Site URL : http://www.ftdichip.com
Agents and Sales Representatives
Please visit the Sales Network page of the FTDI Web site for the contact details our distributor(s) in your country.
FT2232C-Proj04 USB MCU Host Emulator - Sample Project
© Future Technology Devices International Ltd. 2004