Honored Contributor
Honored ContributorHello again,
First and foremost - Thank you very much for the very detailed reply, it was much appreciated! In the meanwhile i have been studying the Avalon specifications, and i now agree, it is not the first thing to focus at right now - the VHDL code describing my component is the difficult part. It is not done yet, but at that point i might have a few questions regarding the Avalon interfacing, if it turns out not to be working with it. The hardware is supposed to return the logarithm of an input, x, using the jacobian logarithm algorithm. Thanks, you made the communication between the program executing on the soft-core processor and the hardware block sound easy, and it also seems to be. If i want to read/write 4 bytes in a row i would use IORD_32DIRECT(base_addr, addr_incr) and IOWR_32DIRECT(base_addr,addr_incr,data). You mentioned that one needs to keep track of where in the address space that the values that the hardware accelerator are located at, and by that i'm not sure of. If we say that this basic full-adder is my "hardware block" - http://www.planet-source-code.com/vb/scripts/showcode.asp?txtcodeid=10203&lngwid=3, and pretend that it is interfaced correctly with the Avalon bus, and let's pretend that the SOPC builder gives me a base address for the full-adder at 0x00101000 - Since Cin is stated as the first port, would that then have zero increment, i.e. base address 0x00101000, increment 0? - Considerering that the Cin was in std_logic(31 downto 0), and x was also in std_logic(31 downto 0), should i, in order to "assign" a value to these inputs just write it as: IOWR_32DIRECT(0x00101000,0,0x12341234); to write in the decimal value corresponding to 0x12341234 hex? To write the same hex value to input x, would it then be: IOWR_32DIRECT(0x00101000,1,0x12341234); ? It would be nice if it worked that way, but i am unsure if the port declarations are kept in that order when imported into SOPC builder - or if i have to modify VHDL code in some other way.
