July 2008
Intermediate to advanced
544 pages
16h 52m
English
Content preview from Computers as Components, 2nd Edition
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166 CHAPTER 4 Bus-Based Computer Systems
External
DRAM
controller
SRAM
High-speed
I/O
device
Low-speed
I/O device
Low-speed
I/O device
ARM
CPU
On-chip
AMBA
high-performance bus (AHB)
AMBA
peripherals bus (APB)
Bridge
FIGURE 4.14
Elements of the ARM AMBA bus system.
4.2 MEMORY DEVICES
In this section, we introduce the basic types of memory components that are com-
monly used in embedded systems. Now that we understand the operation of the
bus, we are able to understand the pinouts of these memories and how values are
read and wr itten. We also need to understand the varieties of memory cells that are
used to build memories.There are several varieties of both read-onl