Distributed write data drivers for burst access memories
First Claim
1. A method comprising:
- providing a memory device having a pinout consisting of a /RAS input pin, a /CAS input pin, a /WE input pin, eight or more address input pins, two or more data output pins, and a /OE input pin;
performing a burst mode access of the memory device; and
latching only one read-write control signal for the burst mode access.
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Abstract
An integrated circuit memory device is designed to perform high speed data write cycles. An address strobe signal is used to latch a first address. During a burst access cycle the address is incremented internal to the device with additional address strobe transitions. A new memory address is only required at the beginning of each burst access. Read/Write commands are issued once per burst access eliminating the need to toggle the Read/Write control line at the device cycle frequency. A transition of the Read/Write control line during a burst access is used to terminate the burst access and initialize the device for another burst access. Write cycle times are maximized to allow for increases in burst mode operating frequencies. Local logic gates near array sense amplifiers are used to control write data drivers to provide for maximum write times without crossing current during input/output line equilibration periods. By gating global write enable signals with global equilibrate signals locally at data sense amp locations, local write cycle control signals are provided which are valid for essentially the entire cycle time minus an I/O line equilibration period in burst access memory devices. For nonburst mode memory devices such as EDO and Fast Page Mode, the write function may begin immediately following the end of the equilibration cycle to provide a maximum write time without interfering with the address setup time of the next access cycle.
173 Citations
6 Claims
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1. A method comprising:
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providing a memory device having a pinout consisting of a /RAS input pin, a /CAS input pin, a /WE input pin, eight or more address input pins, two or more data output pins, and a /OE input pin;
performing a burst mode access of the memory device; and
latching only one read-write control signal for the burst mode access. - View Dependent Claims (2, 3)
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4. A method comprising:
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providing a memory device having a pinout consisting of a /RAS input pin, a /CAS input pin, a /WE input pin, eight or more address input pins, two or more data output pins, and a /OE input pin, wherein the memory device includes two or more output drivers coupled to output data through the data output pins; and
performing a burst mode access of the memory device, wherein performing the burst mode access comprises;
operating the output drivers to drive a byte from memory device onto the data output pins; and
continuing operation of the drivers to drive the byte onto the data output pins without tri-stating the data output pins during predetermined intervals of a strobe signal on at least one of the /RAS or the /CAS input pins; and
latching only one read-write control signal for the burst mode access. - View Dependent Claims (5, 6)
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Specification