Lec2-09 - Chap. 2 Programmers Model Data Types Byte - 8...

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1 Chap. 2 Programmers Model Data Types Byte - 8 bits Half Word - 16 bits. Must be aligned to 2 byte boundaries ( addresses must be even) Word - 32 bits Addresses must end in 0, 4, 8 or C
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2 ARM7TDMI • TDMI = (?) • Thumb instruction set • Debug-interface (JTAG/ICEBreaker) • Multiplier (hardware) • Interrupt (fast interrupts) • The most used ARM-version ARM architecture • 32-bit RISC-processor core (32-bit instructions) • 37 pieces of 32-bit integer registers (16 available) • Pipelined (ARM7: 3 stages) • Cached (depending on the implementation) • Von Neuman-type bus structure (ARM7), Harvard (ARM9) • 8 / 16 / 32 -bit data types • 7 modes of operation (usr, Fq, irq, svc, abt, sys, und) • Simple structure -> reasonably good speed / power consumption ratio
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ARM has 3 stage pipeline, one instruction fetched while second is decoded and third is executed. PC contains address of insruction being fetched. ARM7 internals
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Lec2-09 - Chap. 2 Programmers Model Data Types Byte - 8...

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