(8 points) Assume that you have four (4) ROM chips organized as 16Kx8 with signals OE, CE, A13.0, D.0, and Vpp (similar to one shown in figure 14-14 on page 432). Assume you would like to implement all ROM externally, show the connectivity between the 8051 and those chips to allow the implementation of a complete 64K ROM address space. Make sure to show all signals (i.e. PSEN, address lines, etc) to implement this system correctly (i.e. as shown in figure 14-14). You should also indicate the addresses associate each external ROM chip. 13.0, D^7.0, and Vpp (simlar to one shown in figure Solution The last part is to use it from the application. Typically I have a header file like the one below where I have the addresses defined: /** * \\file * \\brief Interface for the Non-Volatile-Memory * \\author Erich Styger * * This provides an interface to store and retrieve data from the on-chip memory. */ #ifndef CONFIGNVM_H_ #define CONFIGNVM_H_ #define NVMC_FLASH_START_ADDR 0x1FC00 /* NVRM_Config, start address of configuration data in flash */ #define NVMC_FLASH_ERASED_UINT8 0xFF #define NVMC_FLASH_ERASED_UINT16 0xFFFF #define NVMC_REFLECTANCE_DATA_START_ADDR (NVMC_FLASH_START_ADDR) #define NVMC_REFLECTANCE_DATA_SIZE (8*2*2) /* maximum of 8 sensors (min and max) values with 16 bits */ #define NVMC_REFLECTANCE_END_ADDR (NVMC_REFLECTANCE_DATA_START_ADDR+NVMC_REFLECTANCE_DATA_SIZE) #define NVMC_SUMO_DATA_START_ADDR (NVMC_REFLECTANCE_END_ADDR) #define NVMC_SUMO_DATA_SIZE (4) /* 4 bytes of data */ #define NVMC_SUMO_END_ADDR (NVMC_SUMO_DATA_START_ADDR+NVMC_SUMO_DATA_SIZE) uint8_t NVMC_SaveReflectanceData(void *data, uint16_t dataSize); void *NVMC_GetReflectanceData(void); uint8_t NVMC_SaveSumoData(void *data, uint16_t dataSize); void *NVMC_GetSumoData(void); #endif /* CONFIGNVM_H_ */.

1. (8 points) Assume that you have four (4) ROM chips organized as 16Kx8 with signals OE, CE,
A13.0, D.0, and Vpp (similar to one shown in figure 14-14 on page 432). Assume you would like
to implement all ROM externally, show the connectivity between the 8051 and those chips to
allow the implementation of a complete 64K ROM address space. Make sure to show all signals
(i.e. PSEN, address lines, etc) to implement this system correctly (i.e. as shown in figure 14-14).
You should also indicate the addresses associate each external ROM chip. 13.0, D^7.0, and Vpp
(simlar to one shown in figure
Solution
The last part is to use it from the application. Typically I have a header file like the one below
where I have the addresses defined:
/**
* file
* brief Interface for the Non-Volatile-Memory
* author Erich Styger
*
* This provides an interface to store and retrieve data from the on-chip memory.
*/
#ifndef CONFIGNVM_H_
#define CONFIGNVM_H_
#define NVMC_FLASH_START_ADDR 0x1FC00 /* NVRM_Config, start address of
configuration data in flash */
#define NVMC_FLASH_ERASED_UINT8 0xFF
#define NVMC_FLASH_ERASED_UINT16 0xFFFF
#define NVMC_REFLECTANCE_DATA_START_ADDR (NVMC_FLASH_START_ADDR)
#define NVMC_REFLECTANCE_DATA_SIZE (8*2*2) /* maximum of 8 sensors (min
and max) values with 16 bits */
#define NVMC_REFLECTANCE_END_ADDR
(NVMC_REFLECTANCE_DATA_START_ADDR+NVMC_REFLECTANCE_DATA_SIZE)
#define NVMC_SUMO_DATA_START_ADDR
(NVMC_REFLECTANCE_END_ADDR)
#define NVMC_SUMO_DATA_SIZE (4) /* 4 bytes of data */
#define NVMC_SUMO_END_ADDR
(NVMC_SUMO_DATA_START_ADDR+NVMC_SUMO_DATA_SIZE)
uint8_t NVMC_SaveReflectanceData(void *data, uint16_t dataSize);

2. void *NVMC_GetReflectanceData(void);
uint8_t NVMC_SaveSumoData(void *data, uint16_t dataSize);
void *NVMC_GetSumoData(void);
#endif /* CONFIGNVM_H_ */