摘要:
A memory system including large-capacity ROM and RAM in which high-speed reading and writing are enabled is provided. A memory system including a non-volatile memory (CHIP1), DRAM (CHIP3), a control circuit (CHIP2) and an information processing device (CHIP4) is configured. Data in FLASH is transferred to SRAM or DRAM in advance to speed up. Data transfer between the non-volatile memory (FLASH) and DRAM (CHIP3) can be performed in the background. The memory system including these plural chips is configured as a memory system module in which each chip is mutually laminated and each chip is wired via a ball grid array (BGA) and bonding wire between the chips. As data in FLASH can be read at the similar speed to that of DRAM by securing a region in which the data in FLASH can be copied in DRAM and transferring the data to DRAM in advance immediately after power is turned on or by a load instruction, the performance and the function of a mobile device can be enhanced.
摘要:
A semiconductor device including a large capacity non-volatile memory and at least one random access memory, said the access time of said device being matched to the access time of each random access memory. The semiconductor memory device is comprised of: a non-volatile memory FLASH having a first reading time; a random access memory DRAM having a second reading time which is more than 100 times shorter than the first reading time; a circuit that includes a control circuit connected to both the FLASH and the DRAM and enabled to control accesses to those FLASH and DRAM; and a plurality of I/O terminals connected to the circuit. As a result, FLASH data is transferred to the DRAM before the DRAM is accessed, thereby matching the access time between the FLASH and the DRAM. Data is written back from the DRAM to the FLASH as needed, thereby keeping data matched between the FLASH and the DRAM and storing the data.
摘要:
In order to implement a memory having a large storage capacity and a reduced data retention current, a non-volatile memory, an SRAM, a DRAM, and a control circuit are modularized into one package. The control circuit conducts assignment of addresses to the SRAM and DRAM, and stores data that must be retained over a long period of time in the SRAM. In the DRAM, a plurality of banks are divided into two sets, and mapped to the same address space, and sets are refreshed alternately. A plurality of chips of them are stacked and disposed, and wired by using the BGA and chip-to-chip bonding.
摘要:
A memory controller and data processor have their operation mode switched from the page-on mode for high-speed access to a same page to the page-off mode in response to consecutive events of access to different pages, so that the memory access is performed at a high speed and low power consumption.
摘要:
A memory controller and data processor have their operation mode switched from the page-on mode for high-speed access to a same page to the page-off mode in response to consecutive events of access to different pages, so that the memory access is performed at a high speed and low power consumption.
摘要:
In order to implement a memory having a large storage capacity and a reduced data retention current, a non-volatile memory, an SRAM, a DRAM, and a control circuit are modularized into one package. The control circuit conducts assignment of addresses to the SRAM and DRAM, and stores data that must be retained over a long period of time in the SRAM. In the DRAM, a plurality of banks are divided into two sets, and mapped to the same address space, and sets are refreshed alternately. A plurality of chips of them are stacked and disposed, and wired by using the BGA and chip-to-chip bonding.
摘要:
A DRAM adopting a single-intersection memory cell array having randomly accessible data registers accessed whenever the chip is accessed externally. When data items recorded in the data registers are simultaneously written in the memory cell array, the data items are encoded. When data items are read from the memory cell array into the data registers, the data items are decoded. The margin is enhanced because array noise derived from reading is reduced. In addition, the access time of the DRAM is also reduced.
摘要:
A DRAM adopting a single-intersection memory cell array having randomly accessible data registers accessed whenever the chip is accessed externally. When data items recorded in the data registers are simultaneously written in the memory cell array, the data items are encoded. When data items are read from the memory cell array into the data registers, the data items are decoded. The margin is enhanced because array noise derived from reading is reduced. In addition, the access time of the DRAM is also reduced.
摘要:
A DRAM adopting a single-intersection memory cell array having randomly accessible data registers accessed whenever the chip is accessed externally. When data items recorded in the data registers are simultaneously written in the memory cell array, the data items are encoded. When data items are read from the memory cell array into the data registers, the data items are decoded. The margin is enhanced because array noise derived from reading is reduced. In addition, the access time of the DRAM is also reduced.
摘要:
A memory macro is a combination of functional modules such as a main amplifier module, memory bank modules of which each memory bank operates independently, a power source circuit, etc. The storage capacity of the memory macro can be easily changed from a large capacity to a small one by changing the number of the memory bank modules. A control circuit in the memory bank modules of the memory macro has an additional address comparing function. Therefore, the same page can be accessed at high speed without providing any control circuit outside the memory macro. In addition, a module having a function such as a memory access sequence control is provided and, when memory access is made, identification information is issued at the time of inputting/outputting address or data. Therefore, high-speed memory access can be realized by checking the coincidence between the data and address with the ID and controlling the memory access sequence so that the address inputting order and data outputting order can be changed.