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15 Threads found on Cla Adder
ive successfully designed and tested a normal 9bit cla. Now im trying to design a 2 level hierarchical cla to replace the previous 9bit cla. basically 3x3bit clas at level 1 and 2bit cla at level 2. my problem is, how do I pass on the logic functions for group generate/propagate signals and also the (...)
the main difference is in terms of carry propagation speed. csa has less propagation delay compared to cla. that's why we use propagate (p) and generate (g) terms in prefix adders. output is same but the way of solving and methodology is different depending on the lower level equations.
i need a verilog code for 8bit signed carry look ahead adder..... i dont know how to convert the following code... help me soon....:-( module cla(sum,c_8,a,b,c0); input a,b; input c0; outputsum; output c_8; wire p0,p1,p2,p3,p4,p5,p6,p7,g0,g1,g2,g3,g4,g5,g6,g7; wire c1,c2,c3,c4,c5,c6,c7,c8; assign p0=a^b, p1=a^b[
hello can anyone help me with the verilog code for a 16 bit carrylook ahead adder using cla-4 units? i have to submit it by next week and the code i have written seems to show too many errors...
hi friends i want to interface 16 bit carry lookahead adder with PCI, such that data is fed into register A & register B of cla through PCI and the result obtained is again sent back to PCI....kindly help me out....
compare to cla and csa adder which is better according to power consumtion?
You just have to implement the main cla block whit the Propagate-Generate units and then use this as component to build more complicated cla adders
Hi, You can find the information at computer arithmetic book, by B. Parhami. I also have the HDL code for 256 bit cla, but I prefer you do it yourself to learn more. Regards, Mehdi
use synopsys designware if u want design by urself.. use radix-4 booth reduction ,CSA adders for addition of Partial products ,cla for final adder
I read one paper today,and Ladner-Fischer adder(LFA) is said to be the fast adder in this paper.But it seems that carry lookahead adder(cla) is more frequently used for high speed application.And in this paper the data presents that LFA is faster than cla,and also cost smaller gates than (...)
The architecture of the adder depends on the timing/area constraints applied. THe architecture will be selected (say ripple carry or cla or CSA or Brent Kung.... from DW foundation library) during compile command. Regards
Have a look at the following links: Also you can have a look at any book for computer arithmetic.
Hey guys for some reason I have been working on this adder for the past few days and can not get this thing to compile. I am getting an Error: Line 49: VHDL syntax error; unexpected end-of-file. What does this mean? I can't find where the error is. library ieee; use ieee.std_logic_1164.all; ENTITY cla_adder IS PORT (x0, x1, x2, (...)
DW basic only have ripple carry and cla adders. Even if u dont have DW foundation lic u can synthesise with DW foundation and see the results for evaluation purposes. Issue is u cant write out the netlist. I think 500 Mhz speed is too much and wonder for which application u need that much speed. Otherwise u can instantiate gates from the technol
I guess, that 64-bit cla adder is bad idea due to very complicated expressions for generate and propagate signals. I would recommend to use eight 8-bit cla adders with additional group propagate and generate signals as a building block for 64-bit adder. Here is the example from @lter@ site: LIBRARY (...)