Freescale-semiconductor StarCore SC140 Uživatelský manuál stáhnout pdf (Strana 90)

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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

1 2 ... 85 86 87 88 89 90 91 92 93 94 95 ... 759 760

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