Basically the title. I am trying to do a verification on an AXI4Lite protocol. If I try to send a read request to the same address multiple times the RVALID is not re-asserted. Correct data just remains on the RDATA channel.
Sidebar question: Assume 32-bit address width and 32-bit data width. Do I need to be writing to address locations that are 4 locations apart (e.g. 0x00000000, 0x00000004...)?
Yea, for every address transaction, you must be getting RDATA, RRESP, and RVALID asserted from the slave, even if it is the same address. You have to acknowledge each read-data by asserting RREADY.
If 32-bit byte-addressable slave, addresses are typically expected to be aligned as 0x0, 0x4, 0x8... Some slaves support non-aligned addresses. Some don't...For instance: they would simply mask the least significant 2 bits and return the full 32-bit data at 0x0, even if you request data at 0x2 for example... This is implementation specific.