Back to results
US 2007/0183249 A1Published application
Command decoder circuit of semiconductor memory device
AssigneeHynix Semiconductor Inc.
InventorsSun Yang, Jung Park
Life of this patent
Estimating the term…
Abstract
A command decoder circuit generates command signals for performing internal operations and according to external command signals, according to values of the write latency values and whether write latency is an even numbered or odd-numbered value.
Claims19
A command decoder circuit for a semiconductor memory device, the command decoder circuit comprising:
- a clock division/buffer circuit that receives an external clock signal, and which buffers and divides the external clock signal to produce first and second internal clock pulse signals;
- a selector, that receives a write latency signal, the first and second internal clock signals, and which outputs one of the first and second internal clock pulse signals according to a value of the write latency signal;
- and
- a command pass unit that shifts an external command signal according to the write latency value by using an output signal of the selector, thereby outputting a write command signal for performing a write operation.
1 more element
A command decoder circuit of a semiconductor memory device, the command decoder circuit comprising:
- clock generation means for generating an internal clock pulse signal obtained by dividing an external clock signal into at least halves, and outputting either a first internal clock pulse signal synchronized with a rising edge of the internal clock pulse signal, or a second internal clock pulse signal synchronized with a falling edge of the internal clock pulse signal, the external clock signal having a period changing according to operation speeds of the memory device;
- and
- a command pass unit for shifting an external command signal by a write latency signal, using the first or second internal clock pulse signal provided by the clock generation means, thereby outputting a write command signal for performing a write operation.
Dependencies are inferred from the claim text.