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US 6,275,077 B1Granted
Method and apparatus for programmable adjustment of bus driver propagation times
AssigneeSun Microsystems, Inc.
InventorsGarry M. Tobin, Joseph P. Coyle
Life of this patent
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AssigneeSun Microsystems, Inc.
InventorsGarry M. Tobin, Joseph P. Coyle
Estimating the term…
A bus driver introduces a propagation delay of programmable duration prior to transmission of data over a bus. The bus driver has an input stage for acquiring data for transmission over a bus and an output stage having a driver circuit for transmitting data received from the input stage over the bus. The input stage has a first storage element for storing the data for a first period of time responsive to a first clock signal; and a second storage element for storing the data received from the first storage element for a second period of time whose duration is responsive to a second clock signal. The bus driver also has a programmable delay module coupled with the second storage element for regulating the second clock signal in response to a programmable digital signal and thereby regulating duration of the second period of time. The digital signal can be generated, for example, by a computer-executable program, a controller, or other such device, that applies the digital signal, for example, via a JTAG interface/controller.
A bus driver that accepts data in response to a first clock signal and introduces a propagation delay of a programmable duration determined by a programmable digital signal provided to the driver prior to transmission of the data over a bus, the bus driver comprising:
A method of operating a bus driver for accepting data in response to a first clock signal and introducing a propagation delay of a programmable duration determined by a programmable digital signal provided to the driver prior to transmission of the data over a bus, the method comprising:
A computer system comprising a plurality of devices interconnected by a bus, each of the devices including a bus interface, each bus interface including a bus driver and a bus receiver, the bus driver accepting data in response to a first clock signal and introducing a propagation delay of a programmable duration determined by a programmable digital signal provided to the driver prior to transmission of the data over a bus, the bus driver comprising
A bus driver for introducing a propagation delay of a programmable duration determined by a programmable digital signal provided to the driver prior to transmission of a data signal over a bus, the bus driver comprising:
Dependencies are inferred from the claim text.