PXR40RM Datasheet, PDF (354/1434 Pages) Freescale Semiconductor, Inc – PXR40 Microcontroller

Flash Memory Array and Control
Low address space
256KB
(128 bits wide)
Mid address space
256KB
(128 bits wide)
Low address space
256KB
(128 bits wide)
Mid address space
256KB
(128 bits wide)
High address space
3MB
(256 bits wide)
Flash_A array blocks
128-bits wide
8 x16 KB + 2 x 64 KB
2 x128 KB
1 x 256 KB
1 x 256 KB
1 x 256 KB
1 x 256 KB
1 x 256 KB
1 x 256 KB
Flash_B array blocks
128-bits wide
1 x 256 KB
1 x 256 KB
1 x 256 KB
1 x 256 KB
1 x 256 KB
1 x 256 KB
1 x 256 KB
1 x 256 KB
Note: The first 16 bytes of every 32-byte aligned row fall in Array A and the last 16 bytes fall in array B.
Figure 12-1. Flash Segmentation
12.1.1 Block Diagram
12.1.1.1 Flash Memory Module
Figure 12-3 shows a block diagram of the flash memory module. Program execution and data fetches from
the Flash module are performed through the FBIU. Control and status registers, used for flash memory
reprogramming purposes are accessed through PBRIDGE_A.
12-2
PXR40 Microcontroller Reference Manual, Rev. 1
Freescale Semiconductor