68030 Registers

68000 Registers

1. General Purpose Registers

   • D0 - D7 (Data Registers)

   • A0 - A7 (Address Registers)

2. Stack Pointer

   • A7 (User Stack Pointer, USP)

   • SSP (Supervisor Stack Pointer)

3. Program Counter

   • PC (Program Counter)

4. Status Register

   • SR (Status Register)

5. Condition Code Register

   • CCR (Condition Code Register)

68030 Registers

The 68030 includes all the registers of the 68000 with the following enhancements:

1. Cache Control Registers

   • CACR (Cache Control Register)

   • Used to control the on-chip cache.

2. Address Space Registers

   • ASID (Address Space Identifier)

   • Used for virtual memory management.

3. Additional Control Registers

   • TC (Translation Control Register)

   • TT0, TT1 (Transparent Translation Registers)

   • Used for memory management and translation.

4. Vector Base Register (VBR)

   • Allows relocation of the exception vector table, providing more flexibility in handling exceptions.

5. Alternate Function Code Registers (SFC and DFC)

   • SFC (Source Function Code Register)

   • DFC (Destination Function Code Register)

   • These registers are used to control the function codes for memory access, allowing more sophisticated memory management.

Summary

• The 68030 includes all the registers of the 68000.

• The 68030 adds Cache Control Registers (CACR) for cache management.

• The 68030 introduces Address Space Identifier (ASID) for virtual memory management.

• The 68030 includes additional control registers like Translation Control Register (TC) and Transparent Translation Registers (TT0, TT1) for advanced memory management.

• The 68030 retains the Vector Base Register (VBR) and Source Function Code Register (SFC) and Destination Function Code Register (DFC) from the 68010 for enhanced memory management and exception handling.

These enhancements in the 68030 provide improved performance, advanced memory management, and additional features compared to the 68000.