The DEPP.vhd module is designed as an Enhanced Parallel Port (EPP) interface for use with Digilent FPGA boards. It facilitates communication between a host computer and the FPGA via the Digilent Adept software, supporting operations such as address write, data write, and data read cycles.
- Designed for integration with Digilent FPGA boards.
- Supports data transfers with Digilent Adept software.
- Measured data rate of approximately 4.68 kByte/s.
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EPP Address Write Cycle
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EPP Data Write Cycle
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EPP Data Read Cycle
The captures can be found in the Logic Analyzer Captures directory.
| Port Name | Direction | Type | Description |
|---|---|---|---|
| CLK | in | std_logic | Clock signal. Rising edge triggered. |
| CE | in | std_logic | Chip enable. 1 = enabled, 0 = disabled. |
| RST | in | std_logic | Reset signal. 1 = reset, 0 = normal operation. |
| EPP-Interface | out | Virtual bus | EPP Interface for address and data operations. |
| FIFO-Data-Out | out | Virtual bus | FIFO compatible data and address output interface. |
| FIFO-Data-In | in | Virtual bus | FIFO compatible data input interface. |
| FIFO-Address-Out | out | Virtual bus | FIFO compatible request address output interface. |
Detailed information on virtual bus port configurations can be found within the module's documentation.
The module depends on standard logic and numeric libraries available in VHDL. Ensure you have the latest version of the Digilent Adept software for proper interfacing with the module.
Contributions to improve the module or extend its capabilities are welcome. Please adhere to the existing coding standards and provide documentation for any changes made.
This module is open source and is distributed under the MIT license. Please see the LICENSE file for full details.
Special thanks to the Digilent team for providing a reference manual in which the diagrams and the description in the text are contradictory ;-)