11
LatticeECP3 Serial Protocol Board – Revision E
User’s Guide
• D10 (red) illuminated, this indicates that PROGRAMN is low.
• D9 (red) illuminated, this indicates that GSRN is low.
PROGRAMN and GSRN
(see Appendix A, Figure 23)
• These push-button switches assert/de-assert the logic levels on the PROGRAMN (SW3) and GSRN (SW1).
Depressing the button drives a logic level “0” to the device.
CFG [2:0]
(see Appendix A, Figure 23)
• The FPGA CFG pins are set on the board for a particular programming mode via the SW2 DIP switch.
• JTAG programming is independent of the MODE pins and is always available to the user.
• Pushing in (depressing) the switch is ON and sets the value to 0.
Table 6. CFG Mode Selections
CFG2
CFG1
CFG0
Configuration Mode
0(ON)
0(ON)
0(ON)
SPI Flash
0(ON)
1(OFF)
0(ON)
SPIm
1(OFF)
0(ON)
1(OFF)
Slave Serial
1(OFF)
1(OFF)
1(OFF)
Slave Parallel
X
(don’t care)
X
(don’t care)
X
(don’t care)
ispJTAG
On-Board Serial SPI Flash Memory
(see Appendix A, Figure 23)
• One Serial SPI (16-pin TSSOP 64M) Flash memory devices (U11) is on-board for non-volatile configuration
memory storage. Either a STMicro M25P64VMF16 or Macronix MX25L6405 device is populated on-board.
• The CFG [2:0] need to be [000] all depressed to read the Flash memory at power-up or after toggling the PRO-
GRAMN pin.
• J11 must have a jumper between pins 1 and 2.
Programming Serial SPI Flash Memory
The Serial SPI Flash memory device can be configured easily via its JTAG port. This mode enables the FPGA to
be programmed at power-up or assertion of PROGRAMN with a bitstream stored in the memory device.
1.
Connect the evaluation board to the appropriate power sources and power up board.
2.
Connect the ispDOWNLOAD cable to the appropriate header. J9 is used for the 1x10 cable.
3.
Start the ispVM System software.
4.
Press the
Scan
button located in the toolbar. The LFE3-9, LCMXO1200C and ispPOWR1220AT8 devices will
be automatically detected.
5.
Double-click the
Operation
column for the LFE3-95 and the Device Dialog box shown below will open.
6.
In the dialog box select the
SPI Flash Programming Mode
in the Device Access Option pull-down menu. This
will open the SPI Serial Flash Dialog box.