PC87591L datasheet(33/437 Pages) NSC

33 / 437 page

1.0 Introduction (Continued)

Revision 1.07

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1.5.1

Core Address Domain Memory Map

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:

●

On-chip ﬂash in IRE and OBD environments

●

Off-chip memories (SRAM or ﬂash memory) in DEV environment

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

Table 1. PC87591S Memory Map

Address

Size

(Bytes)

Description

Purpose

Environment

00 000016 − 00 DFFF16

56K

Base Memory

IRE & OBD - Internal Flash

DEV - External Base Memory

00 E80016 − 00 F7FF16

System RAM

00 F88016 − 00 F8FF16

Flash Control Registers1

00 F90016 − 00 F90A16

Shared BIOS and Security Registers1

1. See Appendix A on page 408 for details of the implemented registers.

00 F98016 − 00 F98F16

BIU Registers1

00 FA0016 − 00 FA7F16

DMA Controller Registers11

00 FB0016 − 00 FBFF16

256

I/O Expansion

00 FC0016 − 00 FFFF16

On-chip Module Registers1

01 000016 − 01 FFFF16

64K

Base Memory (cont.)

IRE & OBD - Internal ﬂash

DEV - External Base Memory

02 000016 − 0F FFFF16

896K

Reserved

IRE & OBD

Base Memory

DEV - External Base Memory

10 000016 − 1F FFFF16

1024K

Expansion Memory2

2. Available in 176-pin package only.

Figure 5. PC87591x Memory Domains

64K

Mem

Space

Core Address Domain

Host Address Domain

Host Domain Memory

Core Access to Host

End of Flash

External

Memory

Expansion

I/O

Space

Controlled Functions

External

Memory

Expansion

External

Memory

Expansion

PC87591L

PC87591E

PC87591S

(End of Core Memory

Wrap-Around 2M)

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