摘要:
A memory cell array 1 has the arrangement of a plurality of cores, each of which comprises one block or a set of a plurality of blocks, each block defining a range of memory cells serving as a unit of data erase. A core selecting part for selecting an optional number of cores to write/erase data is provided for writing data in memory cells in cores selected on the basis of a write command and for erasing data from selected blocks in cores selected on the basis of an erase command. Thus, there is realized a free core system capable of reading data out from memory cells in unselected cores while writing/erasing data in cores selected by the core selecting part.
摘要:
A semiconductor memory device having a partial activation framework, which provides an efficient page mode operation while operating in a partial activation mode. Control circuits and methods are provided to enable a page mode operation (for read and write data accesses) in a semiconductor memory device (such as a DRAM, FCRAM) having a partial activation framework, resulting in an improved data access speed when data is written/read from memory locations having the same wordline address. In one aspect, a method for accessing data in a memory device comprises activating a first wordline corresponding to a first address to perform a data access operation, receiving a second address after the first address, if the second address is the same as the first address, generating a page mode enable signal for maintaining an activated state of the first wordline corresponding to the first address while activating a second wordline corresponding to the second address, and deactivating the first and second wordlines in response to disabling of the page mode enable signal.
摘要:
The invention includes a logic gate. The logic gate includes a charge holding device. A charging circuit selectively provides a predetermined charge for the charge holding device. A logic gate output is a function of charge on the charge holding device. The logic gate further includes a plurality of inputs. The plurality of inputs are electrically connected to the charge holding device so that the charge of the charge holding device is modified if any of the plurality of inputs is a first voltage potential. The invention also includes an address decoder. The address decoder includes a charge holding device. A charging circuit selectively provides a predetermined charge for the charge holding device. An address decoder output is a function of charge on the charge holding device. The address decoder further includes a plurality of address lines. The plurality of address lines are electrically connected to the charge holding device so that the charge of the charge holding device is modified if any of the plurality of address lines is a first voltage potential.
摘要:
A negative word line driver employs devices to maintain the potential difference between the active word line signal and the inactive word line signal while reducing the need for a significant negative voltage supply. One form of the negative word line driver employs an isolation element to couple the word line to ground when the inputs to the word line driver indicate the word line should not be active, while the word line is also coupled to the negative voltage supply. Another form of the form of the negative word line driver receives as inputs the voltages to be driven on the word line and can be implemented with fewer transistors but still allows the word line to be driven at a negative voltage with a reduced negative voltage supply.
摘要:
A clock generating circuit for a pseudo dual port memory incorporates feedback, delays, and latches to ensure that the write (read) operation clock pulse is sufficiently spaced in time from the read (write) operation clock. The clock generating circuit receives an external clock, a read enable signal, a write enable signal, and a reset signal as inputs. Advantages include minimization of the clock cycle time and operation unaffected by the duty ratio of an external clock. Delay circuitry may be added such that the generated clock signal has sufficient fan out and is sufficiently stable.
摘要:
A memory system, and method of operation therefor, is provided having memory cells for containing data, bitlines for writing data in and reading data from the memory cells, and wordlines connected to the memory cells for causing the bitlines to write data in the memory cells in response to wordline signals. A decoder is connected to the wordlines for receiving and decoding address information in response to a clock signal and an address signal to select a wordline for a write to a memory cell. Latch circuitry is connected to the decoder and the wordlines. The latch circuitry is responsive to the clock signal for providing the wordline signal to the selected wordline for the write to the memory cell and for removing the wordline signal from the selected wordline when the write to the memory cell is complete.
摘要:
Embodiments of the present invention provide a memory device having multiple modes of data transfer. In one embodiment, async/sync logic and a configuration register provide for asynchronous and synchronous data transfer. The async/sync logic utilizes the configuration register and various control signals to determine whether a data transfer operation should be asynchronous or synchronous. The async/sync logic also utilizes the configuration register and various control signals to determine other functionalities of the particular data transfer mode. Functionalities may include normal and page mode, page length, bust read, linear or interleaved burst, burst wrap, burst suspend, data hold length, first access latency, transition between synchronous and asynchronous mode, and the like.
摘要:
Synchronous semiconductor memory devices and methods of operating are provided. The device has a latency N and includes a memory cell array, a stack unit having N storage units and a frequency detector that provides an output signal based on the relationship of the frequency of operation clock to a predetermined frequency. A control circuit controls the stack unit in response to the output signal of the frequency detector. The control circuit latches data read from the memory and controls the stack unit so that the latched data is stored from a clock cycle when a read command is sent until an N-th cycle afterwards if the clock frequency is greater than the predetermined frequency and delays the latched data for one cycle and controls the stack unit so that the delayed data is stored from one cycle after the read command is sent until an N+1 cycle afterwards.
摘要:
Row access information transfer devices and methods are disclosed which use an internal wiring of a memory cell array to transfer information to a column fuse box array. The disclosed techniques and structures can increase the efficiency of a circuit by transferring sense amplifier and wordline control signals relating to a specific row block corresponding to an inputted row address to a column fuse box array using wiring within the cell array, when the row block is accessed in DRAM.
摘要:
A hole driver for driving a hole in a semiconductor memory device, including a first bank controller for generating a control signal for controlling a X-hole of a first bank in response to a row active signal and a precharge signal for the first bank, a second bank controller for generating a control signal for controlling a X-hole of a second bank in response to a row active signal and a precharge signal for the second bank, a block address enable means for generating a common block address enable signal in response to output signals of the first and the second bank control means and a common block address predecoder for predecoding block address signal for each bank in response to the common block address enable signal.