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US 2010/0149890 A1Published application
Devices and methods for controlling a slew rate of a signal line
AssigneeMicron Technology, Inc.
InventorEbrahim H. Hargan
Life of this patent
Estimating the term…
Abstract
In one aspect of the invention, a method of reducing intersymbol interference on a signal line is disclosed. A state machine records previous bits that were transmitted over the line. If the bit on the line has been static for several clock cycles, the slew rate will be increased to facilitate correct reading of the bit for the next clock cycle. If the bit on the line has been dynamic for the previous bits, the slew rate will be a lower slew rate to avoid crosstalk between neighboring lines.
Claims20
A method of increasing digit valid time on a signal line, the method comprising:
- determining a current state of a signal line based on a plurality of serial bits transmitted on a signal line;
- and
- adjusting a slew rate of a driving device in communication with the signal line in response to the current state of the signal line and in response to a value of a next bit in the plurality of serial bits.
A memory device comprising:
- a signal line configured to serially transmit a plurality of serial bits previously received by an input;
- and
- a module configured to monitor the plurality of serial bits and to output a slew rate control signal based on at least two serial bits of the plurality of bits transmitted on the signal line and a subsequent bit to be transmitted in the plurality of serial bits.
Dependencies are inferred from the claim text.