MEMORY INTERFACE ON TMS320C8X

The reason for developing the TMS320C8x - PC - Testboard was to gain experience with the hardware interface of the 'C8x and may be used as a reference design.

Therefore, we have implemented different memory devices on the board. This includes SRAM, SDRAM, VRAM and EPROM. The board has an interface for audio, video - and JTAG - signals so that it can be easily used for demonstration purposes.

A bi-directional FIFO builds the interface to the ISA-Bus and allows one to install the board in a PC and communicate with the 'C8x. A connector with almost all signals of the 'C8x gives the possibility of expanding the board with additional peripherals.

Currently, only the VRAM, the SRAM, the SDRAM and the EPROM are mounted on the board. The function of these memories has been tested. The test was based on a S/W test using the debugger via the JTAG connector.

The connections of Colour Palette, FIFO and TLC320AD65 to the 'C8x are available in the schematics but they have not been implemented or tested with hardware. In the following application report only the connection of the four memory types will be described in detail.

The reason for the implementation of CBTs in the data bus is to show how 5V-TTL-devices could easily be connected to Low Voltage components. Normally the 5V/3.3V conversion would be done by the 'LVT16245 bus driver, which is also used on the board.

Go to the Engineering Design Center to locate information on other TI Semiconductor devices.

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