Cypress Semiconductor CY7C1399B Manual de usuario descargar pdf (Pagina 2)

AN57322

November 4, 2009 Document No. 001-57322 Rev. ** 2

Designing GPIF Interconnect

The GPIF Designer utility is used to create the waveform

descriptors to read and write from the SRAM. The

following steps demonstrate how to define the interface

and create the waveforms.

1. Start the GPIF designer tool.

2. Go to File > New. The following window appears;

Click OK.

3. In the window that pops up, select the appropriate

part and click OK.

4. Right-click the “Un-named” label and rename it as

SRAM.

5. Right-click the “Data [15:8]” band and clear Use this

bus. Only the lower 8 bits of the data bus are used.

6. Right-click on the ADR trace. The Config ADR Lines

dialog box appears. All nine address lines of the GPIF

are used and must remain selected. Click OK.

7. Right-click on the RDY trace. The Config RDY Lines

dialog box appears. SRAM does not have any status

indicators. Therefore, there is no need for any RDY

lines to be defined. Clear the checkboxes under

“External Inputs”. Select the following checkboxes:

 Sync RDY to IFCLK

 Subst TC for RDY5

The window appears as follows. Click OK

8. Right-click on CTL trace. The Config CTL Lines

window is displayed. In this window,

 Select Yes for „Lines can be tristated‟.

 Rename CTL [0-2] lines to CE#, OE#, and WE#

respectively.

 Uncheck the “unused” label (CTL3).

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Cypress Semiconductor CY7C1399B Manual de usuario Pagina 2