lpc2468fet208 NXP Semiconductors, lpc2468fet208 Datasheet - Page 26

• Manufacturer Part Number: lpc2468fet208
• Description: Lpc2468 Single-chip 16-bit/32-bit Micro; 512 Kb Flash, Ethernet, Can, Isp/iap, Usb 2.0 Device/host/otg, External Memory Interface
• Manufacturer: NXP Semiconductors

NXP Semiconductors
LPC2468_2
Preliminary data sheet
7.3 On-chip SRAM
7.4 Memory map
The LPC2468 provides a minimum of 100000 write/erase cycles and 20 years of data
retention.
The LPC2468 includes a SRAM memory of 64 kB reserved for the ARM processor
exclusive use. This RAM may be used for code and/or data storage and may be accessed
as 8 bits, 16 bits, and 32 bits.
A 16 kB SRAM block serving as a buffer for the Ethernet controller and a 16 kB SRAM
associated with the second AHB bus can be used both for data and code storage, too.
Remaining SRAM such as a 4 kB USB FIFO and a 2 kB RTC SRAM can be used for data
storage only. The RTC SRAM is battery powered and retains the content in the absence of
the main power supply.
The LPC2468 memory map incorporates several distinct regions as shown in
Figure
In addition, the CPU interrupt vectors may be remapped to allow them to reside in either
flash memory (default), boot ROM, or SRAM (see
Table 5.
Address range General use
0x0000 0000 to
0x3FFF FFFF
0x4000 0000 to
0x7FFF FFFF
0x8000 0000 to
0xDFFF FFFF
0xE000 0000 to
0xEFFF FFFF
0xF000 0000 to
0xFFFF FFFF
4.
LPC2468 memory usage and details
On-chip
non-volatile
memory and Fast
I/O
On-chip RAM
Off-Chip Memory Four static memory banks, 16 MB each
APB Peripherals
AHB peripherals
Rev. 02 — 16 October 2007
Address range details and description
0x0000 0000 - 0x0007 FFFF
0x3FFF C000 - 0x3FFF FFFF
0x4000 0000 - 0x4000 FFFF
0x7FE0 0000 - 0x7FE0 3FFF
0x7FD0 0000 - 0x7FD0 3FFF
0x8000 0000 - 0x80FF FFFF
0x8100 0000 - 0x81FF FFFF
0x8200 0000 - 0x82FF FFFF
0x8300 0000 - 0x83FF FFFF
Four dynamic memory banks, 256 MB each
0xA000 0000 - 0xAFFF FFFF
0xB000 0000 - 0xBFFF FFFF
0xC000 0000 - 0xCFFF FFFF
0xD000 0000 - 0xDFFF FFFF
36 peripheral blocks, 16 kB each
Section
7.26.6).
Fast communication chip
flash Memory (512 kB)
Fast GPIO registers
RAM (64 kB)
Ethernet RAM (16 kB)
USB RAM (16 kB)
Static memory bank 0
Static memory bank 1
Static memory bank 2
Static memory bank 3
Dynamic memory bank 0
Dynamic memory bank 1
Dynamic memory bank 2
Dynamic memory bank 3
LPC2468
© NXP B.V. 2007. All rights reserved.
Table 5
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