Motorola_68030 Der Motorola 68030 ist ein 32-Bit Mikroprozessor der Motorola 68000er-Familie mit einer integrierten PMMU.

Der Motorola 68030 erhielt eine integrierte programmierbare MMU, mit deren Hilfe Virtuelle Speicherverwaltung möglich wird, und getrennte Cachespeicher für Daten (256 Bytes) und Befehle (256 Bytes). Dem 68EC030 oder 68EC040 fehlte die interne MMU.

von http://www.freescale.com/webapp/sps/site/prod_summary.jsp?code=MC68030

The MC68030 provides a code-compatible upgrade path to the MC68020. It offers enhanced performance through additional cache, a memory management unit, and a bursting data bus. The MC68EC030 offers a lower cost embedded solution by removing the memory management unit. Features

• On-Chip Memory Management Unit (MC68030)
• Internal Harvard Architecture
• 256 Byte Instruction and Data Caches
• Dynamic Bus Sizing
• Burst Memory Interface
• 18 MIPS @ 50MHz
• Available in 16, 20, 25, 33, 40, and 50 MHz
• MC68EC030 Available in 25 and 40 MHz

aus http://www.faqs.org/faqs/motorola/68k-chips-faq/index.html

MC68030:

The MC68030 is essentially an improved 68020. The MC68030 incorporates a paged memory management unit (MMU) and 256 byte instruction and data caches (modified Harvard Architecture). The internal MMU implements most of the functions of the MC68851 MMU. Two 64 bit, three 32 bit and one 16 bit registers have been added for MMU control functions. The improved bus interface supports „burst mode“, asynchronous and synchronous memory accesses as well as dynamic bus sizing support. The Burst Mode fills the data and instruction caches with bytes from external memory independently with four accesses in a row. Many functions of the 68030 operate in parallel increasing throughput. The 68030 can switch between synchronous and asynchronous modes „on the fly“. The '030 is a device useful for new designs and is available in PGA and surface mount packages up to 50 Mhz.

• siehe Datenblatt / besser Bild u/o Tabelle