Motorola 68030 (MC68030) microprocessor family
Motorola 68030 (MC68030) is an enhanced version of 68020 microprocessor. The 68030 CPU has 32-bit address bus and can address up to 4 GB of physical memory. Data bus width on the MC68030 is dynamic - the CPU can work with 8-bit, 16-bit and 32-bit data buses. Both data and address buses can run in new synchronous mode - in this mode data transfer time is reduced up to 33% (from 3 clock cycles to 2 clock cycles). If desired, the 68030 can be switched back to asynchronous mode. Another new bus mode is a burst memory mode. In this mode the bus can transfer up to 4 long words (16 bytes of data) with average transfer time 1 clock cycle per long word. The 68030 integrates modified version of MC68851 Paged Memory Management Unit (PMMU). To control integrated PMMU the CPU has 4 new instructions.
The MC68030 has better performance than the 68020 due to a few core enhancements:
Motorola also produced 68EC030 (MC68EC0300 - embedded version of the 68030 microprocessor. The 68EC030 doesn't have integrated memory management unit, all other features of the 68EC030 are the same as for Motorola 68030.
Some Motorola 68030 and 68EC030 microprocessors were marked with custom part numbers. To identify these processors please see List of Motorola custom part numbers.
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