PXD20RM Datasheet, PDF (1237/1628 Pages) Freescale Semiconductor, Inc – PXD20 Microcontroller

mapping. The byte ordering for 32 bit access is given in Table 35-28 and for 64 bit read access the byte
ordering is given in Table 35-32.
Table 35-24. Memory Mapped Individual Flash Mode - Flash B Address Scheme
Memory Mapped Address
32 Bit Access
0x07800_0000
0x07800_0004
...
0x07FFF_FFF8
0x07FFF_FFFC
Memory Mapped Address
64 Bit Access
0x7800_0000
...
0x7FFF_FFF8
Serial Flash Byte Address
0x000_0000 - 0x000_0003
0x000_0004 - 0x000_0007
...
0x7FF_FFF8 - 0x7FF_FFFB
0x7FF_FFFC - 0x7FF_FFFF
The available address range depends from the size of the external serial flash device. Any access beyond
the size of the external serial flash provides undefined results.
For details concerning the read process refer to Section 35.5.3.3, Flash Read.
35.4.5.4 Memory Mapped Serial Flash Data - Parallel Flash Mode
Starting with address 0x8000_0000 the content of both (identical) external serial flash devices is mapped
into the address space of the device containing the QuadSPI module. Serial flash address byte address 0x0
of both flash devices corresponds to bus address
Read from bus address 0x8000_0000 provides bits [7:4] of both serial flash devices and read from bus
address 0x8000_0001 provides bits [3:0] of both flash devices. Refer to Table 35-25 below for the address
mapping. The byte ordering for 32 bit access is given in Table 35-30 and for 64 bit read access the byte
ordering is given in Table 35-32.
Table 35-25. Memory Mapped Parallel Flash Mode Address Scheme
Memory Mapped Address
32 Bit Access
0x8000_0000
0x8000_0004
0x8000_0008
0x8000_000C
...
Memory Mapped Address
64 Bit Access
0x8000_0000
0x8000_0008
...
Serial Flash A
Byte Address
0x000_0000
-
0x000_0001
0x000_0002
-
0x000_0003
0x000_0004
-
0x000_0005
0x000_0006
-
0x000_0007
...
Serial Flash B
Byte Address
0x000_0000
-
0x000_0001
0x000_0002
-
0x000_0003
0x000_0004
-
0x000_0005
0x000_0006
-
0x000_0007
...
Freescale Semiconductor
PXD20 Microcontroller Reference Manual, Rev. 1
Preliminary—Subject to Change Without Notice
35-27