WIP: AXI4+ATOP Translation Lookaside Buffer (TLB)

[andreaskurth]

Here is a first draft of an AXI TLB. I would highly appreciate initial architectural feedback.

The concept is similar to that of the RAB (no need to reinvent the wheel), but in a fully stream-based, modular implementation (using the common_cells stream infrastructure) and leveraging core axi modules such as axi_demux to handle the protocol.

TODOs

• [ ] Integrate axi_lite_regs from #79.
• [ ] Testbench
• [ ] Documentation

[zarubaf]

I don't have any objections to the hardware architecture. I'd probably designed it very similarly. The stream-based description approach makes the RTL very, very readable. Nice work.

[micprog]

The AXI Translation Lookaside Buffer (TLB) has been moved to a dedicated repository on pulp-platform: axi_tlb