Answer / seetharamukg

Signals updates a value after some "delta" time or at the
end of the process. But variable updates a value immediately.

Both variable and signals are synthesizable.
Designer should know hoe to use these 2 objects.

Ex: Signal usage
Library IEEE;
use IEEE.std_logic_1164.all;
entity xor_sig is
port (
A, B, C: in STD_LOGIC;
X, Y: out STD_LOGIC
);
end xor_sig;
architecture SIG_ARCH of xor_sig is
signal D: STD_LOGIC;
begin
SIG:process (A,B,C)
begin
D <= A; -- ignored !!
X <= C xor D;
D <= B; -- overrides !!
Y <= C xor D;
end process;
end SIG_ARCH;

Variable usage:
Library IEEE;
use IEEE.std_logic_1164.all;
use IEEE.std_logic_unsigned.all;
entity xor_var is
port (
A, B, C: in STD_LOGIC;
X, Y: out STD_LOGIC
);
end xor_var;
architecture VAR_ARCH of xor_var is
begin
VAR:process (A,B,C)
variable D: STD_LOGIC;
begin
D := A;
X <= C xor D;
D := B;
Y <= C xor D;
end process;
end VAR_ARCH;

Draw the timing diagram for a SRAM Read. What happens if we delay the enabling of Clock signal?

0 Answers   Infosys,

---

What happens to delay if you increase load capacitance?

3 Answers   Infosys,

---

Draw the Differential Sense Amplifier and explain its working. Any idea how to size this circuit? (Consider Channel Length Modulation)

0 Answers   Infosys,

---

Explain how binary number can give a signal or convert into a digital signal?

0 Answers  

---

Give a big picture of the entire SRAM Layout showing your placements of SRAM Cells, Row Decoders, Column Decoders, Read Circuit, Write Circuit and Buffers

0 Answers   Infosys,

---

In the design of a large inverter, why do we prefer to connect small transistors in parallel (thus increasing effective width) rather than lay out one transistor with large width?

0 Answers   Infosys,

---

Explain the Working of a 2-stage OPAMP?

0 Answers   Intel,

---

What is the function of enhancement mode transistor?

0 Answers  

---

What transistor level design tools are you proficient with? What types of designs were they used on?

0 Answers   Intel,

---

Draw the Cross Section of an Inverter? Clearly show all the connections between M1 and poly, M1 and diffusion layers etc?

0 Answers   Intel,

---

What is the depletion region?

1 Answers  

---

What is threshold voltage?

0 Answers  

---