Cypress CY62158EV30 Bedienungsanleitung PDF herunterladen (Seite 52)

52 September 5, 2010

Hardware Description

The FPGA expansion board is designed for use with the Stellaris EPI module. Figure F-3 shows a

simplified system block diagram. Components of the default FPGA board are shown in half-tone

outline.

Figure F-3. FPGA Expansion Board Block Diagram

FPGA

The FPGA expansion board features a Xilinx Spartan 3e FPGA, which interfaces to the Stellaris®

microcontroller through its EPI port and acts as a crossbar to the rest of the peripherals.

Camera

The Omnivision OV7690 camera provides color VGA images at up to 30 frames per second to the

FPGA over an 8-bit wide parallel interface. It is configured by the Stellaris microcontroller via I

SRAM

The 1 MB, 8-bit wide, 10 ns SRAM is nominally used as a set of frame buffers. 16 bits of the 20-bit

address space are latched and multiplexed with its data. Access time may be dependent on the

previous address.

Configuration PROM

A Xilinx standard configuration PROM holds the default FPGA image and automatically uploads it

at power-on.

Configuration Pushbutton

To reload the configuration PROM image to the FPGA, press the configuration pushbutton. This

allows you to load a new image via JTAG without resetting the rest of the system.

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Cypress CY62158EV30 Bedienungsanleitung Seite 52