TSK3000A Data Organization

Data organization refers to the ordering of the data during transfers. There are two general types of ordering:

• BIG ENDIAN – the most significant portion of an operand is stored at the lower address

• LITTLE ENDIAN – the most significant portion of an operand is stored at the higher address.

Although the Wishbone specification supports both of these methods for ordering data, the TSK3000A is always BIG ENDIAN.

Words, Half-Words and Bytes

The TSK3000A operates on the following data sizes:

• 32-bit words

• 16-bit half-words

• 8-bit bytes.

There are dedicated load and store instructions for these three data types.

Figure 1 shows how these different sizes of data are organized relative to each other over an 8-byte memory range in the TSK3000A.

Figure 1. Organization of data types for the TSK3000A.