5 memory map, 5 memory map -16 – Cirrus Logic EP93xx User Manual
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DS785UM1
Copyright 2007 Cirrus Logic
ARM920T Core and Advanced High-Speed Bus (AHB)
EP93xx User’s Guide
2
2
2
2.3.5 Memory Map
The memory map for Synchronous Memory Boot and Asynchronous Memory Boot is shown
in
If internal Boot Mode is selected and the register BootModeClr has been written, the address
range 0x0000_0000 -> 0x0000_FFFF is occupied by the internal Boot ROM until the internal
Boot Code is completed. After boot completion, either Synchronous or Asynchronous
memory is re-mapped to occupy this address space.
NOTE: Some memory locations are listed as Reserved. These memory locations should not
be used. Reading from these memory locations will yield invalid data. Writing to these
memory locations may cause unpredictable results.
11,12,14
Reserved
13
FCSE PID Register:
(Read/Write) ARM9TDMI core addresses ranging from 0 to 32MB are
translated by this register to A + FCSE*32MB and then sent to the MMU. If turned off,
straight addresses are sent to the MMU.
15
Test Register Only:
Reads or writes will cause unpredictable behavior.
Table 2-7. Global Memory Map for the Two Boot Modes
Address Range
Sync Memory Boot
Async Memory Boot
ASD0 Pin = 1
ASD0 Pin = 0
0xF000_0000 - 0xFFFF_FFFF
Async memory (nCS0)
Sync memory (nSDCE3)
0xE000_0000 - 0xEFFF_FFFF
Sync memory (nSDCE2)
Sync memory (nSDCE2)
0xD000_0000 - 0xDFFF_FFFF
Sync memory (nSDCE1)
Sync memory (nSDCE1)
0xC000_0000 - 0xCFFF_FFFF
Sync memory (nSDCE0)
Sync memory (nSDCE0)
0x9000_0000 - 0xBFFF_FFFF
Not Used
Not Used
0x8080_0000 - 0x8FFF_FFFF
APB mapped registers
APB mapped registers
0x8010_0000 - 0x807F_FFFF
Reserved
Reserved
0x8000_0000 - 0x800F_FFFF
AHB mapped registers
AHB mapped registers
0x7000_0000 - 0x7FFF_FFFF
Async memory (nCS7)
Async memory (nCS7)
0x6000_0000 - 0x6FFF_FFFF
Async memory (nCS6)
Async memory (nCS6)
0x5000_0000 - 0x5FFF_FFFF
Reserved
Reserved
0x4000_0000 - 0x4FFF_FFFF
PCMCIA (Slot 0)
PCMCIA (Slot 0)
0x3000_0000 - 0x3FFF_FFFF
Async memory (nCS3)
Async memory (nCS3)
0x2000_0000 - 0x2FFF_FFFF
Async memory (nCS2)
Async memory (nCS2)
0x1000_0000 - 0x1FFF_FFFF
Async memory (nCS1)
Async memory (nCS1)
0x0001_0000 - 0x0FFF_FFFF
Sync memory (nSDCE3)
Async memory (nCS0)
0x0000_0000 - 0x0000_FFFF
Sync memory (nSDCE3)
or
Internal Boot ROM
if INTBOOT is selected
Async memory (nCS0)
or
Internal Boot ROM
if INTBOOT is selected
Table 2-6. CP15 ARM920T Register Description (Continued)
Register
Description