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64 lines
1.7 KiB
C
64 lines
1.7 KiB
C
/*
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* external_mem.h
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*
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* Created on: Nov 25, 2011
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* Author: Doug
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*/
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#ifndef EXTERNAL_MEM_H_
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#define EXTERNAL_MEM_H_
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#include <stdint.h>
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#include <stdbool.h>
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// Holds info about the chip (retrieved with JEDEC standards)
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struct ChipID
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{
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uint8_t manufacturerID;
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uint8_t deviceID;
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};
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// Initializes the (bit-banged) external memory interface
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void ExternalMem_Init(void);
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// Sets the value outputted to the address lines
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void ExternalMem_SetAddress(uint32_t address);
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// Sets the value outputted to the data lines
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void ExternalMem_SetData(uint32_t data);
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// Sets the value outputted to the address and data lines
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void ExternalMem_SetAddressAndData(uint32_t address, uint32_t data);
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// Puts the data lines into input mode, for reading back stored data
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void ExternalMem_SetDataAsInput(void);
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// Reads back the value the chips are putting onto the data lines
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uint32_t ExternalMem_ReadData(void);
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// Sets the state of the chip select line
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void ExternalMem_AssertCS(void);
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void ExternalMem_DeassertCS(void);
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// Sets the state of the write enable line
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void ExternalMem_AssertWE(void);
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void ExternalMem_DeassertWE(void);
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// Sets the state of the output enable line
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void ExternalMem_AssertOE(void);
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void ExternalMem_DeassertOE(void);
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// Reads a set of data...
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void ExternalMem_Read(uint32_t startAddress, uint32_t *buf, uint32_t len);
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// Performs a write cycle
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void ExternalMem_WriteCycle(uint32_t address, uint32_t data);
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// Does an unlock sequence on the chips
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void ExternalMem_UnlockAllChips(void);
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// Identifies the chips that are currently in the SIMM
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void ExternalMem_IdentifyChips(struct ChipID *chips);
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#endif /* EXTERNAL_MEM_H_ */
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