Parallel Flash Loader Megafunction User Guide (PDF) - Altera

Page 12
Functional Description
Mapping PFL and Flash Address
Figure 6 through Figure 9 show the address connections between the PFL
megafunction and the flash memory device. The address connections vary depending
on the flash memory device vendor and data bus width.
In Figure 6, the address connection between the PFL megafunction and the flash
memory device are the same.
Figure 6. Micron J3 Flash Memory in 8-Bit Mode
PFL
address: 24 bits
Flash Memory
address: 24 bits
23
22
21
-
-
-
2
1
0
23
22
21
-
-
-
2
1
0
In Figure 7, flash memory addresses in Micron J3, P30, and P33 16-bit flash memory
shift one bit down in comparison with the flash addresses in the PFL megafunction.
The flash address in the Micron J3, P30, and P33 flash memory starts from bit 1 instead
of bit 0.
Figure 7. Micron J3, P30, and P33 Flash Memories in 16-Bit Mode
PFL
address: 23 bits
22
21
20
-
-
-
2
1
0
Flash Memory
address: 23 bits
23
22
21
-
-
-
3
2
1
In Figure 8, flash memory addresses in Spansion 8-bit flash shifts one bit up. Address
bit 0 of the PFL megafunction connects to data pin D15 of the flash memory.
Figure 8. Spansion and Micron M28, M29 Flash Memory in 8-Bit Mode
PFL
address: 24 bits
23
22
21
-
-
-
2
1
0
Flash Memory
address: 24 bits
22
21
20
-
-
-
1
0
D15
May 2013 Altera Corporation Parallel Flash Loader Megafunction User Guide