Testing impedance adjustment
First Claim
1. A method of operating an integrated circuit device, comprising:
- connecting a particular node of the integrated circuit device to a first voltage node through a reference resistance and connecting the particular node to a second voltage node through a termination device of a signal driver circuit of the integrated circuit device;
for at least one resistance value of the termination device, generating a voltage level at the particular node in response to a voltage differential between the first voltage node and the second voltage node, and comparing that generated voltage level to a reference voltage;
determining that no available resistance value of the termination device generates a voltage level at the particular node that is deemed to match the reference voltage using a predetermined criteria;
altering a voltage level of the reference voltage;
for a particular resistance value of the termination device, generating a voltage level at the particular node in response to the voltage differential between the first voltage node and the second voltage node, and comparing that generated voltage level to the altered reference voltage;
deeming the termination device as passed when, for the particular resistance value of the termination device, the comparing of the voltage level generated at the particular node to the altered reference voltage is deemed a match using the predetermined criteria; and
deeming the termination device as failed when, for the particular resistance value of the termination device, the comparing of the voltage level generated at the particular node to the altered reference voltage is not deemed a match using the predetermined criteria.
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Accused Products
Abstract
Methods of operating integrated circuit devices are useful in testing impedance adjustment. Methods include connecting a node of the integrated circuit device to a first voltage node through a reference resistance and connecting the node to a second voltage node through a termination device, and comparing a voltage level at the node to a reference voltage for at least one resistance value of the termination device. When no available resistance value of the termination device generates a voltage level at the node that is deemed to match the reference voltage, the voltage level of the reference voltage may be altered, and the voltage level at the node may be compared to the altered reference voltage. When the voltage level at the node is deemed to match the altered reference voltage, the termination device may be deemed as passed. Otherwise, the termination device may be deemed as failed.
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Citations
20 Claims
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1. A method of operating an integrated circuit device, comprising:
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connecting a particular node of the integrated circuit device to a first voltage node through a reference resistance and connecting the particular node to a second voltage node through a termination device of a signal driver circuit of the integrated circuit device; for at least one resistance value of the termination device, generating a voltage level at the particular node in response to a voltage differential between the first voltage node and the second voltage node, and comparing that generated voltage level to a reference voltage; determining that no available resistance value of the termination device generates a voltage level at the particular node that is deemed to match the reference voltage using a predetermined criteria; altering a voltage level of the reference voltage; for a particular resistance value of the termination device, generating a voltage level at the particular node in response to the voltage differential between the first voltage node and the second voltage node, and comparing that generated voltage level to the altered reference voltage; deeming the termination device as passed when, for the particular resistance value of the termination device, the comparing of the voltage level generated at the particular node to the altered reference voltage is deemed a match using the predetermined criteria; and deeming the termination device as failed when, for the particular resistance value of the termination device, the comparing of the voltage level generated at the particular node to the altered reference voltage is not deemed a match using the predetermined criteria. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method of operating an integrated circuit device, comprising:
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connecting a particular node of the integrated circuit device to a first voltage node through a reference resistance and connecting the particular node to a second voltage node through a termination device of a signal driver circuit of the integrated circuit device; for at least one resistance value of the termination device, generating a voltage level at the particular node in in reponse to a voltage differential between the first voltage node and the second voltage node, and comparing that generated voltage level to a reference voltage; determining that no available resistance value of the termination device generates a voltage level at the particular node that is deemed to match the reference voltage using a predetermined criteria; altering a voltage level of the reference voltage in response to a defined tolerance for the resistance value of the termination device; for a particular resistance value of the termination device, generating a voltage level at the particular node in response to the voltage differential between the first voltage node and the second voltage node, and comparing that generated voltage level to the altered reference voltage; deeming the termination device as passed when, for the particular resistance value of the termination device, the comparing of the voltage level generated at the particular node to the altered reference voltage is deemed a match using the predetermined criteria; and deeming the termination device as failed when, for the particular resistance value of the termination device, the comparing of the voltage level generated at the particular node to the altered reference voltage is not deemed a match using the predetermined criteria. - View Dependent Claims (12, 13, 14, 15, 16)
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17. A method of operating an integrated circuit device, comprising:
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connecting a particular node of the integrated circuit device to a first voltage node at a first voltage level through a reference resistance and connecting the particular node to a second voltage node at a second voltage level through a termination device of a signal driver circuit of the integrated circuit device, wherein the second voltage level is greater than the first voltage level; for at least one resistance value of the termination device, generating a voltage level at the particular node in response to a voltage differential between the second voltage level and the first voltage level, applying that generated voltage to a first input of a voltage comparator, and applying a reference voltage that is half-way between the first voltage level and the second voltage level to a second input of the voltage comparator; determining that no available resistance value of the termination device results in a transition of a logic level of an output signal of the voltage comparator; altering a voltage level of the reference voltage to increase the voltage level of the reference voltage in response to a defined tolerance for the resistance value of the termination device if the termination device is at a highest adjustable resistance value of the termination device, and to decrease the voltage level of the reference voltage in response to the defined tolerance for the resistance value of the termination device if the termination device is at a lowest adjustable resistance value of the termination device; for a particular resistance value of the termination device, generating a voltage level at the particular node in response to the voltage differential between the second voltage level and the first voltage level, applying that generated voltage to the first input of the voltage comparator, and applying the altered reference voltage to the second input of the voltage comparator; deeming the termination device as passed if the logic level of the output signal of the voltage comparator transitions in response to applying the altered reference voltage to the second input of the voltage comparator while applying the voltage level generated at the particular node for the particular resistance value of the termination device to the first input of the voltage comparator; and deeming the termination device as failed if the logic level of the output signal of the voltage comparator does not transition in response to applying the altered reference voltage to the second input of the voltage comparator while applying the voltage level generated at the particular node for the particular resistance value of the termination device to the first input of the voltage comparator. - View Dependent Claims (18, 19, 20)
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Specification