UM10503
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© NXP B.V. 2012. All rights reserved.
User manual
Rev. 1.3 — 6 July 2012
18 of 1269
3.1 How to read this chapter
The available peripherals and their memories vary for different parts.
•
Ethernet: available only on LPC435x/3x.
•
USB0: available only on LPC435x/3x/2x.
•
USB1: available only on LPC435x/3x.
•
SRAM: see
.
•
Flash: see
The registers and memory regions corresponding to unavailable peripheral and memory
blocks are reserved.
3.2 Basic configuration
In the CREG block (see
), select the interface to access the 16 kB block of RAM
located at address 0x2000 C000. This RAM memory block can be accessed either by the
Embedded Trace Buffer (ETB) or be used as normal SRAM on the AHB bus.
Remark:
When the ETB is used , the 16 kB memory space at 0x2000 C000 must not be
used by any other process.
3.3 Memory configuration
3.3.1 On-chip static RAM
The LPC43xx support up to 264 kB SRAM on flashless parts or up to 136 kB on parts with
on-chip flash with separate bus master access for higher throughput and individual power
control for low power operation (see
).
When the Embedded Trace Buffer is used (see ETBCFG register,
), the 16 kB
memory space at 0x2000 C000 must not be used by any other process.
UM10503
Chapter 3: LPC43xx Memory mapping
Rev. 1.3 — 6 July 2012
User manual
Table 10.
LPC43xx SRAM configuration
Part
Local SRAM
Local SRAM AHB SRAM AHB SRAM AHB
SRAM/
ETB
SRAM
0x1
000
00
00
0x1
008
00
00
0x2
000
00
00
0x2
000
80
00
0x2
000
C0
00
LPC4350
128 kB
72 kB
32 kB
16 kB
16 kB
LPC4330
128 kB
72 kB
32 kB
16 kB
16 kB
LPC4320
96 kB
40 kB
32 kB
16 kB
16 kB