3.2.3 Memory Interface Functions

All accesses to the memory blocks within the data file are done through the dp_get_data function within the DirectC code. This is true for all system types.

This function returns an address pointer to the byte containing the first requested bit. The dp_get_data function takes two arguments:

• var_ID: An integer variable, which contains an identifier specifying which block within the data file needs to be accessed.
• bit_index: The bit index addressing the bit to address within the data block specified in Var_ID. Upon completion of the function, it is expected that return_bytes indicates the total number of valid bytes available for the client of the function.

See Systems with Direct Access to the Memory Containing the Data File and Systems with Indirect Access to the Data File for more details.