Altera Parallel Flash Loader IP User Manual
Page 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
54
Specifications
UG-01082
2015.01.23
Altera Corporation
Parallel Flash Loader IP Core User Guide