Hi all: I have the following verilog codes which shift the serial data to parallel data.But it cost too much LEs in Altera FPGA.Then I want to make it wokes in EAB.I do not what to do.Anybody would help me?
reg[31:0] reg_in[7:0],reg_out[7:0];
always @(posedge clk) begin if(reset) cnt8
I don't think an EAB will help you much. This code will use one LAB (8 LEs) for the shift register and 3 or 4 more LEs for the counter. The shift register can fit in an EAB (but not with the counter), so you will save only one LAB for using an EAB. Why do you think this uses too many LEs?
-- Rick "rickman" Collins rick.collins@XYarius.com Ignore the reply address. To email me use the above address with the XY removed. Arius - A Signal Processing Solutions Company Specializing in DSP and FPGA design URL http://www.arius.com 4 King Ave 301-682-7772 Voice Frederick, MD 21701-3110 301-682-7666 FAX
Question...
Wont you receive valid serial data when cnt8 = 8 ? Your code does not seem to sample serial data when cnt8 = 8 and just seems to output parallel data.
- Prasanna
I guess you overlooked the register definition:
reg[31:0] reg_in[7:0],reg_out[7:0];
Corret me if I am wrong, the code is actually converting an 8 bit wide data input to a 256 wide data output, so it requires much more than 8 LEs.
Take a look at the link below to see if it helps:
Jim Wu snipped-for-privacy@yahoo.com
cnt8 will never reaches 8. It counts 0 to 7. But I think you are right in that reg_in will not shift serial data in on cnt8 = 7. It stops shifting and so only 7 serial in samples are ever loaded into reg_in before 8 bits are parallel loaded to reg_out. So reg_out will get 7 new bits and one old bit. This can be changed so that reg_in gets shifted outside of the if statement. Then every clock will shift in and reg_out will get 8 new bits each time.
-- Rick "rickman" Collins rick.collins@XYarius.com Ignore the reply address. To email me use the above address with the XY removed. Arius - A Signal Processing Solutions Company Specializing in DSP and FPGA design URL http://www.arius.com 4 King Ave 301-682-7772 Voice Frederick, MD 21701-3110 301-682-7666 FAX
ElectronDepot website is not affiliated with any of the manufacturers or service providers discussed here. All logos and trade names are the property of their respective owners.