Altera Parallel Flash Loader IP Manuale Utente Scaricare il pdf (Pagina 54)

Example 4: Burst Mode

• Burst mode configuration time calculation:

.rbf size for EP2S15 = 577KB = 590,848 Bytes

Configuration mode = FPP without data compression or encryption

Flash access mode = Burst Mode

Flash data bus width = 16 bits

Flash access time = 100 ns

PFL input Clock = 100 MHz

DCLK ratio = 2

• Use the following formulas in this calculation:

Caccess = Taccess*Fclk+1

Cflash for Burst Mode = 1

Ccfg = 2

Coverhead = 20* Caccess + 8

Total Clock Cycles = Coverhead + max (Cflash, Ccfg)*N

Total Configuration Time = Total Clock Cycle/ PFL Input Clock

• Substitute these values in the following formulas:

Caccess = (100ns * 100 MHz) + 1 = 11

Cflash = 1

Ccfg = 2

Coverhead = (20*11)+8 = 228

Total Clock Cycles = 228 + 2 * 590848 = 1181924

Total Configuration Time at 100 MHz = 1181924 / 100 × 106 = 11.82 ms

Specifications

UG-01082

2015.01.23

Altera Corporation

Parallel Flash Loader IP Core User Guide

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Altera Parallel Flash Loader IP Manuale Utente Pagina 54