Connect Tech FreeForm/PCI-104 User Manual
Revision 0.00 9
PCI-104 Header (P1)
Refer to PCI-104 specifications.
JTAG Programming Header (P2)
Use P2 to configure the FPGA via JTAG. Refer to Programming the FPGA for more information.
Power pins are for voltage reference only; they do not provide power to the configuration
circuitry.
Note that the FPGA can always be programmed via JTAG, regardless of the J1 configuration
setting.
Table 4: JTAG Programming Header Pinout (P2)
Pin Signal Direction
1 TRST Input
2 TMS Input
3 TDI Input
4 TDO Output
5 TCK Input
6 GND Reference
7 3.3V Reference
SPI Flash Programming Header (P3)
P3 may be used to directly program the SPI flash, providing that J1 is set correctly to the tri-state
FPGA position. The power pins are for voltage reference only. They do not provide power to the
configuration circuitry.
Table 5: SPI Flash Programming Header Pinout (P3)
Pin Signal Direction
1 SPI_CSN Input
2 SPI_MOSI Input
3 SPI_MISO Output
4 SPI_CLK Input
5 GND Reference
6 3.3V Reference
Note:
P1 must be connected to a PCI-104 stack supplying
both 3.3V and 5V