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CPU32 Emulation 101

Chapter 6: Using Internal Registers (SIM and EMSIM Registers)

Internal Representation of SIM and EMSIM Registers

Internal Representation of SIM and EMSIM

Registers

Internal to the emulator the EMSIM and SIM memory spaces are

accessed using memory suffixes of the form offset@emsim and

offset@reg. All memory mapped registers in the 683xx family are

contained within a contiguous 4k block of memory (8k for the 68360).

The base address is determined by the SIM MCR MM bit in the 6833x or

the MBAR in the 68340 and 68360 processors. The internal

representation within the emulator of these registers is maintained as

an offset to the memory mapped register base. Referencing memory as

offset@emsim will access a SIM copy value in the EMSIM. Referencing

offset@reg will access a register within the processor. For example, on

a 68332 the memory address 00a00@emsim will access the EMSIM

MCR and 0a00@reg will access the SIM MCR. The memory address

0@reg within a 68340 will access its SIM MCR.

The command used to compare the values with the EMSIM and SIM

will result in memory references using this notation. For example

suppose the command is given to compare the SIM and EMSIM within

the 68332. Further suppose that the values in the Clock Synthesizer

Control differ. This is the SIM register SYNCR. The resulting display

may look as follows:

0a04@emsim=000, 0a04@reg=03f

0a05@emsim=000, 0a05@reg=008

Refer to the processor data book to understand which SIM register is

differing.

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Motorola CPU32 Betriebsanweisung Seite 102