Cypress Semiconductor CY7C1399B Uživatelský manuál stáhnout pdf (Strana 5)

AN57322

November 4, 2009 Document No. 001-57322 Rev. ** 5

8. A DP must be implemented after s0. To do this, set

an action point on the Status Trace by clicking at the

right boundary of s0.

9. A dialog box appears prompting you for DP branch

conditions. Select the condition as follows.

10. This sets the GPIF to look at only one signal, the

TCXpire flag. When the transaction count expires, the

GPIF sets the TCXpire flag to 1. To set the branch

condition, branch to the IDLE state and terminate the

waveform. Otherwise, loop back to S0 and continue

with the waveform. The transaction count decrements

with every “Next FIFO Data” operation.

11. The internal FIFO pointer must be incremented in the

waveform. To do this, right-click on the action point at

the end of s0 on the data trace and select Next FIFO

Data. This is highlighted by the yellow trace. The

waveform should appear as follows.

12. Next, increment the GPIFADR lines. To do this, click

on the Addr trace at the left boundary of s1. The final

waveform appears as follows:

13. Save your waveform by selecting File > Save.

Read Waveform

Read waveforms are designed to read data from the SRAM into the Endpoint FIFO. They must satisfy the timing requirements

of the various signals involved in the read cycle of the SRAM.

The process is similar to designing the write waveform. First, review the read cycle timing for the SRAM and its timing

parameters.

Figure 3. Read Cycle Timing for SRAM

CTL0

CTL1

PB[7:0]

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Cypress Semiconductor CY7C1399B Uživatelský manuál Strana 5