Method and apparatus for automatically loading configuration data on reset into a host adapter integrated circuit
First Claim
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1. A method of loading configuration data after a reset condition into a host adapter integrated circuit from an external device, comprising:
- receiving a reset signal on a first terminal of a host adapter integrated circuit, said host adapter integrated circuit being operatively coupled to a host; and
upon a deassertion of said reset signal, automatically outputting a clock signal from a second terminal of said host adapter integrated circuit to said external device such that configuration data is clocked out of said external device and into a third terminal of said host adapter integrated circuit, said reset signal remaining deasserted throughout said loading of said configuration data, said configuration data not being transferred from said host to said host adapter integrated circuit.
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Abstract
Configuration data indicative of interface requirements for interfacing to a host adapter card are automatically serially loaded on reset from an external device on the card into a host adapter integrated circuit on the card. A driver program can then read the configuration data from the host adapter integrated circuit and thereby determine how to interface with the host adapter card.
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Citations
14 Claims
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1. A method of loading configuration data after a reset condition into a host adapter integrated circuit from an external device, comprising:
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receiving a reset signal on a first terminal of a host adapter integrated circuit, said host adapter integrated circuit being operatively coupled to a host; and upon a deassertion of said reset signal, automatically outputting a clock signal from a second terminal of said host adapter integrated circuit to said external device such that configuration data is clocked out of said external device and into a third terminal of said host adapter integrated circuit, said reset signal remaining deasserted throughout said loading of said configuration data, said configuration data not being transferred from said host to said host adapter integrated circuit. - View Dependent Claims (2)
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3. A system, comprising:
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a host; a first storage device storing first configuration data and having a first terminal and a second terminal; and a first host adapter integrated circuit operatively coupled to said host, said first host adapter integrated circuit outputting a clock signal to said first terminal of said first storage device such that said first configuration data from said first storage device is output from said second terminal of said first storage device and is loaded serially into said first host adapter integrated circuit, said first configuration data being indicative of a first set of interface requirements; a second storage device storing second configuration data and having a first terminal and a second terminal; and a second host adapter integrated circuit operatively coupled to said host, said second host adapter integrated circuit outputting a clock signal to said first terminal of said second storage device such that said second configuration data from said second storage device is output from said second terminal of said second storage device and is loaded serially into said second host adapter integrated circuit, said second configuration data being indicative of a second set of interface requirements, said first and second host adapter integrated circuits being substantially identical integrated circuits. - View Dependent Claims (4)
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5. A system, comprising:
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a host; a peripheral device; means for storing configuration data external to said host; and a host adapter integrated circuit operatively coupled to said peripheral device via a first bus, said host adapter integrated circuit comprising; a first terminal; a second terminal; a shift register having a clock input lead, a serial data input lead, and a plurality of parallel data output leads, said clock input lead being coupled to said first terminal, said serial data input lead being coupled to said second terminal, said second terminal being coupled to said means for storing configuration data such that configuration data is output from said means and onto said second terminal under control of said host adapter integrated circuit after a power up condition without said configuration data passing into or out of said host; and a system bus interface operatively coupled to said host via a second bus. - View Dependent Claims (6, 7, 8, 9, 10, 11, 12, 13, 14)
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Specification