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Figure 13: Implementing Page Mode and Option Bits in the CFI Flash Memory Device
The end address depends on the density of the flash memory device. For the address range for devices
with different densities, refer Byte Address Range table.
You must specify the byte address for the option bits sector.
Option Bits
Configuration Data (Page 2)
Configuration Data (Page 1)
Configuration Data (Page 0)
Page 2 Address + Page-Valid
Page 1 Address + Page-Valid
Page 0 Address + Page-Valid
End Address
0x000000
8 Bits
32 Bits
Figure 14: Page Start Address, End Address, and Page-Valid Bit Stored as Option Bits
Bits 0 to 12 for the page start address are set to zero and are not stored as option bits. The Page-Valid bits
indicate whether each page is successfully programmed. The PFL IP core programs the Page-Valid bits
after successfully programming the pages.
Page Start Address [19:13] Page-Valid
Bit 7...Bit 1 Bit 0
Page Start Address [27:20]
Bit 7...Bit 0
0x002000
0x002001
Page End Address [19:13]
Bit 7...Bit 1
0x002002
Page End Address [27:20]
Bit 7...Bit 0
0x002003
(For flash byte addressing mode)
Table 5: Byte Address Range for CFI Flash Memory Devices with Different Densities
CFI Device (Megabit) Address Range
8 0x00000000x00FFFFF
UG-01082
2015.01.23
Storing Option Bits
17
Parallel Flash Loader IP Core User Guide
Altera Corporation
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