PXN20RM Datasheet, PDF (328/1376 Pages) Freescale Semiconductor, Inc – PXN20 Microcontroller

Flash Memory Array and Control
Flash array blocks
Low-address space—256 KB
Low-address space
8 x 16 KB + 2 x 64 KB
Mid-address space—256 KB
Mid-address space
2 x 128 KB
High-address space—1.5 MB
High-address space
2 x 256 KB
2 x 256 KB
2 x 256 KB
Figure 12-1. Flash Segmentation
12.1.1 Block Diagram
Figure 12-2 shows a block diagram of the flash memory module. The FBIU is addressed through the
system bus while the flash control and status registers are addressed through the slave (peripheral) bus.
V_SS V_FLASH V_DD
System
bus
Flash bus
interface
unit
(FBIU)
Flash memory module
Flash memory
interface
(MI)
Control/status
registers
Flash core
Slave
bus
Figure 12-2. Flash System Block Diagram
12-2
PXN20 Microcontroller Reference Manual, Rev. 1
Freescale Semiconductor