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III Moving the Data: the Memory Bus
Up to this point we have described
some of the basic types of memory you will find in a modern PC. We will
now discuss how the data moves to and from the RAM to the CPU and other
components of the PC. This data flow takes place
on the memory bus of the motherboard and is made
up of three key components:
- Memory Controller
- Data Bus
- Address Bus
- Memory Controller
The first key component
in the memory bus is the memory controller.
This is a hardware logic circuit that is typically
integrated into the chipset of the motherboard
(Chipsets are discussed in Chapter 0010). The memory controller
is in charge of generating the necessary signals
for reading and writing data to and from
RAM. The memory controller also interfaces
the memory with the various other devices in the
system, such as the hard drive and video
controller.
With the memory controller
controlling the signals for accessing the RAM,
the actual data is moved to and from
the RAM on a series of wires known as the memory
bus. The memory bus is comprised of two
separate components, the data bus and the address
bus.
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