Must be decoded by the peripheral within one clock cycle. That means that the address PER_ADDR and the control signals PER_EN and PER_WE Indicates an active-write on a byte of a wordīus transfers on the peripheral bus always complete within one clock cycle. It defines 5 signals used to connect peripherals. One of these busses is the peripheral bus. Section 6 of the OpenMSP430 User Guide describes the busses used to realize system integration. However, we will stick to the default peripheral address range. The openmsp430 implementation supports an extended and configurable) peripheral range up to 32KB (0x7FFF). The MSP-430 memory space for peripheral access extends from byte address 0 toĪddress 0x1FF (511). We will deal withĪ variety of design issues - finding a proper location in the memory map finding the currect access method from C detecting software register access from hardware and vice versa. The openmsp430 architecture, as well as into software. Our objective is to design such registers in Verilog and integrate them into To writing to and reading from the hardware register. Such that writing to and reading from that memory location corresponds The register is directly accessibleįrom software because it is mapped into a memory location of the memory-map, It’a hardware register, typically as wide as the data word-width in the system, that canīe written to and read from in software. We’ll introduce a crucially important linkīetween the world of hardware and software: the memory-mapped register.Ī memory-mapped register is exactly what it says it is. Today we take a first step towards building customized MSP-430 based systemsĭerived from the openmsp430.
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