Freescale Semiconductor StarCore SC140 - Manual (Page 90)

2-58 SC140 DSP Core Reference Manual
Memory Interface
Table 2-26 describes the data representation for each 64-bit row in Figure 2-21.
2.4.1.3 Data Moves
Data moves are executed by moving core registers to and from memory over one of the data buses (XDBA
or XDBB).
The data registers can be accessed with three types of data:
• Long type access, writing or reading 32-bit operands.
• Word type access, writing or reading 16-bit operands.
• Byte type access, writing or reading 8-bit operands.
Figure 2-22 shows an example of data transfer in big and little endian modes.
Table 2-26. Data Representation in Memory
Representation Type Value
Eight 8-bit bytes A0 = $0a, A1 = $0b, A2 = $0c, A3 = $0d, A4 = $0e, A5 = $0f
Four 16-bit numbers A8 = $0102, A10 = $0304, A12 = $0506, A14 = $0708
Two 32-bit numbers A16 = $11223344, A20 = $ccddeeff