Cypress CY62158EV30 Manual de usuario descargar pdf (Pagina 53)

Stellaris® LM3S9B96 Development Kit User’s Manual

September 5, 2010 53

Test Port

Eight uncommitted FPGA pins are brought to test pads. Five of the FPGA pins can only be used

as inputs. The remaining three FPGA pins can be used as inputs or outputs.

Camera Connector

The camera is hosted by the FPC Connector P1 located to the left of the FPGA. To insert or

remove the camera, first open the latch by grasping either side of the connector and gently lifting

straight up. With the latch open, the camera moves easily; do not force. The camera faces away

from the FPGA. Close the latch by pushing down on it gently before use.

Caution – Handle the camera carefully when inserting or removing it from the board. Never force

the camera into a different position, doing so could damage the camera.

5V Power Pin

J5 is used to provide 5-V power to the FPGA expansion board's regulators. This must be

connected for successful board operation. Connect the the male EPI expansion connector on the

bottom side of the FPGA expansion board to the female EPI expansion connector on the

DK-LM3S9B96 development board (J2). The LCD header pins should fit through the holes on the

PCB.

24-MHz Oscillator

The camera and the camera interface portion of the FPGA are clocked by a 24-MHz external

oscillator.

External Peripheral Interface (EPI) Module

The External Peripheral Interface (EPI) module provides a slave interface for use with the Stellaris

microcontroller’s EPI controller configured in general-purpose mode A12-D16. The direction of the

signal allocation is in relation to the FPGA (for example, a signal labeled In is an input to the

FPGA, a signal labelled Out is an output from the FPGA). See Table F-8 on page 63 for a list of the

EPI signals.

NOTE: Only 16-bit or 32-bit transfers are allowed for this interface.

Using the Widget Interface

This section provides information about writing your own graphics using the widget interface for

the FPGA expansion board.

Writing Your Own Stellaris Application

The Stellaris microcontroller communicates with the default FPGA image through a

memory-mapped interface. To get started, you must first configure the EPI port by doing the

following:

1. Configure the GPIO.

2. Configure the EPI port and map it into memory at 0xA000.0000.

Code Example F-1 Configuring the EPI Port

EPIModeSet(EPI0_BASE, EPI_MODE_GENERAL); //General Purpose mode

EPIDividerSet(EPI0_BASE, 1); //Divide system clock by 2

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Cypress CY62158EV30 Manual de usuario Pagina 53