ECNG1014 : Digital Electronics (Semester II- 2024/2025)
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The following is the datapath block diagram of a keypad encoder system for a billing system.
Write the VHDL code for the port-mapping of the keypad encoder system.
NB: Only the VHDL code for the port mapping aspect is needed.
The Basys 3 is an entry-level FPGA development board designed exclusively for the AMD Vivado Design Suite featuring the AMD Artix 7 FPGA architecture. Basys 3 is the newest addition to the popular Basys line of FPGA development boards for students or beginners just getting started with FPGA technology. List the steps required in implementing a digital electronic system using VHDL and the Basys3 toolkit.
Read Only Memory (ROM) called CEDRIX_XT has a 3-bit input ADDRESS and a 3-bit output DATA_OUT. CEDRIX_XT has truth table as follows:
ADDRESS
|
DATA_OUT
|
001
|
001
|
010
|
010
|
011
|
100
|
for all other values
|
111
|
Write the complete code for the VHDL Test Bench required for behavioural simulation of
PORT TYPE
|
PORT NAME
|
BITWIDTH
|
Inputs
|
CLK
|
1
|
|
RESET
|
1
|
|
G_IN
|
6
|
Outputs
|
D_OUT
|
11
|
|
TC
|
1
|
Bidirectional
|
WT
|
9
|
The entity of IETA _UNIT is given below:
entity A
Port(CLK : B;
RESET : C
G_IN : D
D_OUT : E;
TC : F;
WT : G);
end H
Letters A,B,C,D,E,F,G,H are used in place of required syntax for the entity of
Seana was asked to convert (100011010111.111001010011)2 to Hexadecimal number representation format. She gave the correct solution. Her solution was replaced with letters U,V,W,X,Y,Z as shown below:
(0011100011010111.11100101)2 = (UVWX.YZ)16
Identify the letters U,V,W,X,Y,Z
Randy was asked to convert (19.25)10 to binary number representation format. He gave the correct solution. Parts of his solution are shown below:
Conversion of (19)10 to binary
|
Integer Quotient
|
Remainder
|
Coefficient
|
19/2
|
A
|
B
|
a0 = C
|
D
|
E
|
F
|
a1 = G
|
H
|
I
|
J
|
a2 = K
|
L
|
M
|
N
|
a3 = O
|
P
|
Q
|
R
|
a4 = S
|
Conversion of (.25)10 to binary
|
Integer
|
Fraction
|
Coefficient
|
0.25 × 2
|
T
|
U
|
a-1 = V
|
0.5 × 2
|
W
|
X
|
a-2 = Y
|
Hence 19.2510 = (a a
Identify the letters A-Z
Derive the Signed Magnitude for the number -7
Sign (in binary format)
|
|
Magnitude (in binary format)
|
|
Signed Magnitude
|
|
Jan was asked to perform Binary
Multiplication of (11.01)
2 and (1.1)2. She gave the correct solution. Parts of his solution were
replaced with letters A-H as shown below:
Using the IEEE 754 floating-point standard for 32-bit numbers, determine the correct floating point representation for +(11001.001)2.
Sign-bit (in binary format)
|
|
Exponent (in decimal format)
|
|
Bias (in decimal format)
|
|
Bias Exponent (in binary format)
|
|
Mantissa (in binary format)
|
|
The Boolean expression for an output
Q(A,B,C,D) = (A+D’)’ + B’(CD’)’
Use De Morgans’s Theorem to convert the expression for to a Sum-of-Product (SOP) expression. DO NOT MINIMIZE the SOP.
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