Continue to Site

Welcome to EDAboard.com

Welcome to our site! EDAboard.com is an international Electronics Discussion Forum focused on EDA software, circuits, schematics, books, theory, papers, asic, pld, 8051, DSP, Network, RF, Analog Design, PCB, Service Manuals... and a whole lot more! To participate you need to register. Registration is free. Click here to register now.

Register Log in

shift left/shift right in VHDL

Status
Not open for further replies.
D

dksagra

Junior Member level 1
Joined
Jul 26, 2010
Messages
19
Helped
0
Reputation
0
Reaction score
0
Trophy points
1,281
Location
india
Activity points
1,493
Dear

Question: how to shift left or shift right t

Rough program as follows

Code: 
library IEEE
...
...

Package matrix_types Is
Type matrix_4x1 Is Array (1 to 4) Of std_logic_vector (7 downto  0);
Type matrix_1x4 Is Array (1 to 4) Of std_logic_vector (7 downto  0);
Type matrix_4x4 Is Array (1 to 4, 1 to 4) Of std_logic_vector (7 downto
0);
End Package matrix_types ;
...
...
architecture.......
begin
.....
process
.......

Variable x : matrix_4x1 :=
("000000100",
"0000000000",
"0011110000",
"0010110001");

begin
QUERY: Now i have to shift left or shift right EACH ROW of variable x either TWICE or
THRICE etc.

Please reply me dear...

Thanks and Best Regards,
 
Last edited by a moderator:

a <= b(6 downto 0) & '0'; -- shift left with '0' add
a <= '0' & b(7 downto 1); -- shift right with '0' add
...
 

Thanks for the reply..
you are right..but this is the case when you have single variable std_logic_vector, in my case its a matrix of 4x1.

Variable x : matrix_4x1 :=
("000000100",
"0000000000",
"0011110000",
"0010110001");

how can i shift each row of this matrix?
 

you should used a variable which
VARIABLE v_row : STD_LOGIC_VECTOR(7 DOWNTO 0);

on which you apply the shift before to rewrite it in the array.

and if you want to do it for each row, you could used a LOOP.
 

thanks for your valuable time..

if possible for you, can you please explain in detail with the example..

as for Variable x : matrix_4x1 :=
("000000100",
"0000000000",
"0011110000",
"0010110001");

please look after it...
thanks and Regards
 

Status
Not open for further replies.

Similar threads

Part and Inventory Search

Welcome to EDABoard.com

Sponsor

Back
Top