AXI interface hangs when given both AWVALID and AWREADY

[ZipCPU]

See

tinyTPU/src/vhdl/AXI/tinyTPU_v1_0_S00_AXI.vhd

Lines 353 to 366 in b8df109

	case AWVALID_ARVALID is
	when "10" =>
	WRITE_ADDRESS_EN <= '1';
	READ_ADDRESS_EN <= '0';
	STATE_ns <= WRITE_ADDRESS;
	when "01" =>
	WRITE_ADDRESS_EN <= '0';
	READ_ADDRESS_EN <= '1';
	STATE_ns <= READ_ADDRESS;
	when others =>
	WRITE_ADDRESS_EN <= '0';
	READ_ADDRESS_EN <= '0';
	STATE_ns <= IDLE;
	end case;

If both AWVALID and AWREADY are true on the same clock, the design should pick one, and come back later to handle the other.