Lattice Semiconductor ispMACH 4256V User Manual page 14

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
Reference Designator
Part Number
Manufacturer
Web Site
Table 9. JTAG Programming Pin Information
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
Reference Designators
Part Number
Manufacturer
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.
Item
Description
Test Data Output
Test Data Input
Test Mode Select
Test Clock
Item
ispMACH 4256V Breakout Board Evaluation Kit
Description
U2
FT2232HL
Future Technology Devices International (FTDI)
www.ftdichip.com
ispMACH 4256V Pin
107:TDO
2:TDI
74:TMS
35:TCK
Description
D1, D2, D3, D4, D5, D6, D7, D8, D9
LTST-C190KRKT (D1-D8)
LTST-C190KGKT (D9)
Lite-On It Corporation
www.liteonit.com
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