Little Endian Data Format; Endianism Conversion - Texas Instruments OMAP5910 Technical Reference Manual

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Table 2–69. Little Endian Data Format

Table 2–70. Big Endian Format

Because the TI925T is operated in little endian mode and the DSP is operated

in big endian mode, shared data must be converted to their respective formats

before any processing is done. Table 2–69 and Table 2–70 illustrate the little

and big data formats, respectively. In each case, the data is a reference to the

little endian format.

There are two ways to share the data between the TI925T and the DSP:

Through the DSP MMU

Through the MPUI

Endianism conversion is implemented between these two modules and the

DSP. The hardware converts both program code and data from big endian to

little endian mode when writing to the system memory and from little endian

to big endian mode when reading back from the system memory for all the data

access sizes when the logic is enabled.

Endianism conversion is performed in hardware, so that the data swapping is

transparent to software (reduce software overhead to format the data).

A bypass path is also implemented. If this case is not covered, the swapping

logic can be disabled and the conversion handled by software.

Little Endian Format (32-Bit Word Access)

Big Endian Format (32-Bit Word Access)

Endianism Conversion

MPU Subsystem