In the past we used a generic to set the initial memory contents on altera.
Unfortunately, quartus compiles big generics slowly (read: hours).
Now we can load from a .mif file instead, which is much faster (seconds).
Thus, this old option is no longer needed.

According to Peter Jansweijer, Precision and Questasim had trouble
synthesizing the crossbar HDL. After tracking the problem down via
email, it appears that these tools cannot handle nested functions
correctly; they crash or fail when trying to access the parameters
of the lexically enclosing function.

Therefore, this patch just outright removes all nested functions.

Each clock domain needs a separate reset line.
However, one cannot reset only a single domain---that could cause inconsistency
at clock crossing boundaries.
This change splits reset lines per clock domain and centralizes generation.

to ensure stabilization.

Tomasz Wlostowski authored 13 years ago and Tomasz Wlostowski committed 13 years ago

Added:
- asynchronous SRAM bus -> Wishbone bridge (wb_async_bridge)
- Conmax interconnect (wb_conmax)
- GPIO port (wb_gpio_port)
- Very simple timer (wb_simple timer)
- Simple UART (wb_uart)
- Vectored Interrupt controller (wb_vic)
- Virtual UART (mmapped FIFO, wb_virtual_uart)
- wbgen2 core generator libraries (wbgen2)

Quartus will not process a 'file_open' call during synthesis,
so we can instead initialize the RAM with a vhdl constant.

Updated uses of the wishbone_pkg to use Tom's naming conventions.
Added Manifests for the new files.

  manual -- configure bus_end directly
  layout -- configure bus_end from nested bus layout
... and fix a bug where the dpram size was incorrect

  record count is 16 bit
  index aliased decription (to avoid overflow)

Added feature:
  make it easy to relocate a device to a new address

Checks added:
  confirm address ranges to not overlap during synthesis
  check wbd_begin/end addresses for compatability with the crossbar

Decode the SDWB blocks to create bus addresses in the sdwb_crossbar.
I still need to add assertions to confirm the user didn't give bad inputs.