Altera Parallel Flash Loader IP User Manual
Page 52
Example 2: Normal Mode
• Normal mode configuration time calculation:
.rbf
size for EP2S15 = 577KB = 590,848 Bytes
Configuration mode = FPP without data compression or encryption
Flash access mode = Normal 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 Normal Mode = Caccess / 2
Ccfg = 2.5
Coverhead = 3*Caccess
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 * 100MHz) + 1 = 11
Cflash = 11/2 = 5.5
Ccfg = 2.5
Coverhead = 3*11 = 33
Total Clock Cycles = 33 + 5.5 * 590848 = 3249697
Total Configuration Time at 100 MHz = 3249697/ 100 × 106 = 32.5ms
52
Specifications
UG-01082
2015.01.23
Altera Corporation
Parallel Flash Loader IP Core User Guide