Open Access
Board Overview
2-4
ARM Development Board (ARM7TDMI Version)
Hardware Reference Guide
ARM DUI 0017C
Memory types
A typical system might provide some of the following memory types:
•SRAM
• EPROM
• FLASH
• DRAM
Examples of all of these can be found on the board.
Each memory type has its own controller. An ideal system might have a single external bus
interface (EBI). In this implementation the EBI is distributed into separate memory
controllers.
Figure 2-1: Overview of the ARM Development Board
External Bus I/F
ASB
Expansion
AMBA Bus Master
ARM
PLD
Arbiter
Decoder
“On-chip”
SRAM
32K x 32
ROM SRAM DRAM I/O
Test
I/F
3V-5V Level Shift
APB
Bridge
Timer
Interrupt
Controller
APB
Expansion
512K
x 8
128K
x 32
0-8 M
SIMM
PCMCIA
Parallel +
Serial Port
hrg.book Page 4 Wednesday, July 22, 1998 9:18 AM
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