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45 Merge branch cache-playground (r23-r30 and r34-r44) into trunk

This primarily adds the following features the the processor:
- A direct-mapped instruction cache with configurable cache line width and
number of cache lines.
- Various bug fixes for bugs that appeared when the processor could run
instructions at full speed but had to stall for data.
- A "Hello World" test application.		 skordal 3462d 00h /
44 Add instruction cache and use the WB adapter as dmem interface skordal 3462d 01h /
43 Improve instruction fetch logic skordal 3462d 01h /
42 Move check for stall from irq_asserted to exception_taken in EX stage skordal 3462d 01h /
41 Make continouous status register reads asynchronous skordal 3462d 01h /
40 Reduce example design clock frequency to 50 MHz

- Also includes a minor change to make the address decoder/interconnect work
better with burst transfers.		 skordal 3462d 01h /
39 Disable IRQs when handling exceptions skordal 3462d 01h /
38 Add "Hello World" test application skordal 3462d 02h /
37 Add macro to set the TOHOST register from C code skordal 3462d 02h /
36 Ensure correct read of CSR after stall skordal 3462d 02h /
35 Prevent jumping/branching when stalling skordal 3462d 02h /
34 Prevent flushing the pipeline if it is stalling skordal 3462d 02h /
33 Ensure correct read of CSR after stall skordal 3462d 02h /
32 Prevent jumping/branching when stalling skordal 3465d 00h /
31 Prevent flushing the pipeline if it is stalling skordal 3465d 01h /
30 Add testcase for a combination of instructions that fail when using cache skordal 3467d 05h /
29 Add reset functionality for the WB arbiter state machine skordal 3470d 00h /
28 Add rudimentary User's manual skordal 3476d 00h /
27 Prevent exceptions from being taken while stalling skordal 3476d 01h /
26 Prevent exceptions from being taken while stalling

Jumping to an exception handler while stalling and waiting for a load/store
instruction to finish can cause undefined results from the load/store
instruction. This actually fixes the issue mentioned in revision r20.		 skordal 3476d 04h /

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