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      On-chip program RAM, ROM, or high-speed external program memory can
      be used at full speed with no wait states. Alternatively, the READY
      line can interface the TMS320C2x to slower, less expensive external
      memory. A total of 64K words of memory space is available. Internal
      RAM block B0 can be configured as program memory using instructions
      for that purpose. Execution from this block can be initiated after
      the memory space has been reconfigured.

      In addition, the TMS320C25 is equipped with 4K words of on-chip
      program ROM that can be mask-programmed at the factory with a
      customer's program. The on-chip ROM allows program execution at full
      speed without the need for high speed external program memory. The
      use of this memory also allows the external data bus to be freed for
      access of external data memory.

      Mapping of the first 4K word block of off-chip/on-chip__
      program  memory is user-selectable by means of the MP/MC
      (microprocessor/microcomputer) pin on the TMS320C25. This permits
      the designer to accelerate time-to-market with a TMS320C25-based
      product by using external ROM, and cost-reducing it later with the
      4K internal ROM without any PC
                               __
      redesign. Setting the MP/MC high maps in the block of off-chip
      memory; holding the pin low maps in the block of on-chip ROM.
                                                              __
      The XF (external flag) pin can be used to toggle the MP/MC pin to
      dynamically enable or disable the on-chip ROM. Note that care must
      be taken and instruction pipeline operation understood when using
      bank switching. See the Second Generation User's Guide for more
      information on the pipeline operation.
             __
      The MP/MC pin on the TMS320C25 is a V(CC) pin on the TMS32020. This
      allows substitution of a TMS320C25 for a TMS32020 since the
      TMS320C25 automatically operates in the microprocessor mode and
      therefore is plug-in compatible in the system.