14
ispMACH 4256V Breakout Board Evaluation Kit
JTAG Interface Circuits
For power and programming, a FTDI chip USB UART/FIFO IC converter provides a communication interface
between a PC host and the JTAG programming chain of the Breakout Board. The USB 5 V supply is also used as a
source for the 3.3 V supply rails. A USB mini-B socket is provided for the USB connector cable.
Table 8. JTAG Interface Reference
Item
Description
Reference Designator
U2
Part Number
FT2232HL
Manufacturer
Future Technology Devices International (FTDI)
Web Site
www.ftdichip.com
Table 9. JTAG Programming Pin Information
Description
ispMACH 4256V Pin
Test Data Output
107:TDO
Test Data Input
2:TDI
Test Mode Select
74:TMS
Test Clock
35:TCK
LEDs
A green LED (D9) is used to indicate USB 5V power. Eight red LEDs are driven by I/O pins of the ispMACH 4256V
CPLD.
Table 10. Power and User LEDs Reference
Item
Description
Reference Designators
D1, D2, D3, D4, D5, D6, D7, D8, D9
Part Number
LTST-C190KRKT (D1-D8)
LTST-C190KGKT (D9)
Manufacturer
Lite-On It Corporation
Web Site
Power Supply
3.3 V supply rail is converted from the USB 5 V interface when the board is connected to a host PC.
Test Points
In order to check the various voltage levels used, test points are provided:
• TP1, VCC3D (VCCO Bank 0)
• TP2, VCC3D (VCCO Bank 1)
• TP3, VCC3D (VCC Core)
USB Programming and Debug Interface
The USB mini-B socket of the Breakout Board serves as the programming and debug interface.
JTAG Programming: For JTAG programming, a preprogrammed USB PHY peripheral controller is provided on the
Breakout Board to serve as the programming interface to the ispMACH 4256V CPLD.
Programming requires the ispVM System software.
