The MicroBlaze processor uses Big-Endian or Little-Endian format to represent data, depending on the selected endianness. The parameter C_ENDIANNESS is set to 1 (little-endian) by default.
The hardware supported data types for 32-bit MicroBlaze are word, half word, and byte. With 64-bit MicroBlaze the data types long and double are also available in hardware.
When using the reversed load and store instructions LHUR, LWR, LLR, SHR, SWR, and SLR, the bytes in the data are reversed, as indicated by the byte-reversed order.
The following tables show the bit and byte organization for each type.
| Big-Endian Byte Address | n | n+1 | n+2 | n+3 | n+4 | n+5 | n+6 | n+7 |
| Big-Endian Byte Significance | MSByte | LSByte | ||||||
| Big-Endian Byte Order | n | n+1 | n+2 | n+3 | n+4 | n+5 | n+6 | n+7 |
| Big-Endian Byte-Reversed Order | n+7 | n+6 | n+5 | n+4 | n+3 | n+2 | n+1 | n |
| Little-Endian Byte Address | n+7 | n+6 | n+5 | n+4 | n+3 | n+2 | n+1 | n |
| Little-Endian Byte Significance | MSByte | LSByte | ||||||
| Little-Endian Byte Order | n+7 | n+6 | n+5 | n+4 | n+3 | n+2 | n+1 | n |
| Little-Endian Byte-Reversed Order | n | n+1 | n+2 | n+3 | n+4 | n+5 | n+6 | n+7 |
| Bit Label | 0 | 63 | ||||||
| Bit Significance | MSBit | LSBit | ||||||
| Big-Endian Byte Address | n | n+1 | n+2 | n+3 |
| Big-Endian Byte Significance | MSByte | LSByte | ||
| Big-Endian Byte Order | n | n+1 | n+2 | n+3 |
| Big-Endian Byte-Reversed Order | n+3 | n+2 | n+1 | n |
| Little-Endian Byte Address | n+3 | n+2 | n+1 | n |
| Little-Endian Byte Significance | MSByte | LSByte | ||
| Little-Endian Byte Order | n+3 | n+2 | n+1 | n |
| Little-Endian Byte-Reversed Order | n | n+1 | n+2 | n+3 |
| Bit Label | 0 | 31 | ||
| Bit Significance | MSBit | LSBit | ||
| Big-Endian Byte Address | n | n+1 |
| Big-Endian Byte Significance | MSByte | LSByte |
| Big-Endian Byte Order | n | n+1 |
| Big-Endian Byte-Reversed Order | n+1 | n |
| Little-Endian Byte Address | n+1 | n |
| Little-Endian Byte Significance | MSByte | LSByte |
| Little-Endian Byte Order | n+1 | n |
| Little-Endian Byte-Reversed Order | n | n+1 |
| Bit Label | 0 | 15 |
| Bit Significance | MSBit | LSBit |
| Byte Address | n | |
| Bit Label | 0 | 7 |
| Bit Significance | MSBit | LSBit |