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      The 544 words of on-chip data RAM are divided into three separate
      blocks (B0, B1, and B2). Of the 544 words, 256 words (block B0) are
      configurable as either data or program memory by instructions
      provided for that purpose; 288 words (blocks B1 and B2) are always
      data memory. A data memory size of 544 words allows the TMS320C2x
      to handle a data array of 512 words (256 words if on-chip RAM is
      used for program memory), while still leaving 32 locations for
      intermediate storage.

      The  TMS320C2x can address a total of 64K words of data memory. The
      on-chip data memory and internally reserved locations are mapped
      into the lower 1K words of data memory space. Data memory is
      directly expandable to 64K words while still maintaining full-speed
      operation. A READY line is provided to interface slower, less-
      expensive memories, such as DRAM's.