ASC Bridge Board
Evaluation Board User Guide
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FPGA-EB-02025-2.0
7
3.
Setting Up the Board
To set up the board:
Attach four of the included nylon standoffs to the ASC Bridge Board (only one standoff is needed at the narrow
edge of the board).
Attach two of the included nylon standoffs to the outside edge of each ASC Breakout Board.
Connect the ASC Bridge Board using the Versa connectors (J2 and J3) to either the MachXO3-9400 Development
Board or the ECP5 Versa Development Board.
Connect the ASC Breakout Board(s) using J6, J7 and J13 as shown in
Figure 2.1
. The number of ASC Breakout Boards
to install is based on the design requirement.
Slide SW3 to the MachXO3 position if the MachXO3-9400 Development Board is connected.
Note: SW3 can also remain in the MachXO3 position for new ECP5 designs as long as the I
2
C pins are mapped
according to
Table D.4
in
Appendix D
. SW3 only needs to be in the ECP5 position to support a legacy demo design.
SW3 swaps the SDA and SCL signals on the ASC Bridge Board (see
Figure A.2
in
Appendix A
).
4.
Applying Power to the Board
The 3.3 V system power is supplied by either the MachXO3-9400 Development Board or the ECP5 Versa Development
Board. Depending on your design requirement, the 5 V and 12 V power can be applied through the ASC Breakout Board
(after the Hot Swap and/or Trim circuits have been populated).
Refer to the either the
MachXO3-9400 Development Board User Guide (FPGA-EB-02004)
or the
ECP5 Versa
Development Board User Guide (FPGA-EB-02021)
, and
ASC Breakout Board User Guide (FPGA-EB-02023)
on how to
connect these power supplies. When using the 5 V and 12 V power supply, only one ASC Breakout Board is needed to
connect to the power source. By shorting jumpers J8, J9, and J14, the 5 V supply connects to the other ASC Breakout
Boards. Jumpers J4, J5, and J12 will do the same for the 12 V supply.
Note: The ASC Breakout Board may be populated with user supplied 3.3 V voltage regulator (DCDC5). When setting up
the platform, be sure that only one board is supplying the 3.3 V power to prevent power supply contention.
5.
System Clock
The 8 MHz system source clock comes from the ASC0 device. When using the MachXO3-9400 Development Board, no
clock jumpers need to be installed on the ASC Bridge Board; the ASC0 device is located on the MachXO3-9400
Development Board and the clock signal is hard-wired to the MachXO3.
When using the ECP5 Versa Development board, the ASC0 device can be plugged-in to any of the ASC connectors.
Shorting one of the jumpers, J10, J11, J15, enables the ASC0 ASCCLK to connect to ECP5 device. It is recommended to
connect only one jumper.
Table 5.1. ASC0 ASCCLK Jumper Setting
ASC Connector
ASC0 Clock Jumper
ASC0 Connector
J10
ASC1 Connector
J15
ASC2 Connector
J11
