pc87591l National Semiconductor Corporation, pc87591l Datasheet - Page 33

• Manufacturer Part Number: pc87591l
• Description: Lpc Mobile Embedded Controllers
• Manufacturer: National Semiconductor Corporation

Revision 1.07
1.0 Introduction
1.5.1
The memory and I/O devices are directly mapped into the 2 Mbyte address space of the core. The core address space can
include both code and data. However, access to data stored in the first 64 Kbytes of the address space is more efficient.
Most of the core code and constant data (including its boot section) is stored in the Base Memory. This memory is:
External memory may be added to the Base Memory to expand the amount of memory available for the application. The on-
chip RAM and various peripherals are also mapped into the core address space.
Tables 1 to 3 show how the PC87591x memory and I/O devices are mapped in the core address space. Appendix A on
page 408 shows the address map of the registers for the other modules.
Addresses not included in the following three tables or Appendix A are reserved. Attempts to access reserved addresses
produce unpredictable results
Host Address Domain
4G
0
On-chip flash in IRE and OBD environments
Off-chip memories (SRAM or flash memory) in DEV environment
00 FB00
00 FC00
00 0000
00 E800
02 0000
10 0000
00 F880
00 F900
00 F980
00 FA00
01 0000
Space
Core Address Domain Memory Map
Mem
1. See Appendix A on page 408 for details of the implemented registers.
2. Available in 176-pin package only.
Address
16
16
16
16
16
16
16
16
16
16
16
64K
0
00 DFFF
01 FFFF
0F FFFF
1F FFFF
00 F8FF
00 F90A
00 FBFF
00 F7FF
00 F98F
00 FA7F
00 FFFF
Space
(Continued)
I/O
16
16
16
16
16
16
16
16
16
16
16
.
(Bytes)
1024K
896K
Size
56K
64K
256
4K
11
16
1K
Core Access to Host
Controlled Functions
Host Domain Memory
Figure 5. PC87591x Memory Domains
Table 1. PC87591S Memory Map
Base Memory
System RAM
Flash Control Registers
Shared BIOS and Security Registers
BIU Registers
DMA Controller Registers1
I/O Expansion
On-chip Module Registers
Base Memory (cont.)
Reserved
Base Memory
Expansion Memory
End of Flash
Purpose
1
33
2
2M
1M
0
1
Expansion
PC87591E
PC87591S
External
1
Memory
1
Description
Core Address Domain
(End of Core Memory
Wrap-Around 2M)
IRE & OBD - Internal Flash
DEV - External Base Memory
IRE & OBD - Internal flash
DEV - External Base Memory
IRE & OBD
DEV - External Base Memory
1
Environment
2M
1M
4K
0
PC87591L
Expansion
Expansion
External
External
Memory
Memory
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