01-Mar-11

1

Bi tp VXL Ch01

Little endian and Big endian

Variable X has 4-byte representation

0x01234567 (01234567H)

Big Endian

Little Endian

0x100 0x101 0x102 0x103

01 23 45 6701 23 45 67

0x100 0x101 0x102 0x103

67 45 23 0167 45 23 01

0x000 ....

0x100 ....

01-Mar-11

2

Memory

Given a ROM module of size 128 x 8.

a) How many address lines and data lines

does it have?

b) How many of these 128 x 8 ROMs are

needed to build a 16K x 16 ROM?

MemoryFill in the sizes of the ROM modules shown below.

01-Mar-11

3

1) What is the organization and capacity of each of the memory devices?

RAM organization: _____ RAM Capacity (in bits): _____

ROM organization: _____ ROM Capacity (in bits): _____

2) Write the address ranges (in hex) to which each memory device responds:

RAM: ___________________________________________

ROM: ___________________________________________

3) What kind of address decoding (full address decoding or partial address decoding) is used for each memory device:

Full address decoding is used for .

Partial address decoding is used for ________.

01-Mar-11

4

a) How many address lines do we need for each device (EPROM, RAM,

PIO [Parallel Input Ouput])?

b) What kind of address decoding (full address decoding or partial address

decoding) is used for figure (a) ?

c) Find the address range of each device in figures (a) .

a) How many address lines do we need for each device (EPROM, RAM,

PIO [Parallel Input Ouput])?

b) What kind of address decoding (full address decoding or partial address

decoding) is used for figure (b) ?

c) Find the address range of each device in figures (b) .