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US 8,947,959 B2Granted
Memory device and compressive test method for the same
AssigneeHynix Semiconductor Inc.
InventorKang-Youl Lee
Life of this patent
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Abstract
A memory device includes a first bank, a second bank, a plurality of interface pads, and a data output unit configured to output compressed data of the first bank through at least one interface pad among the plurality of interface pads and subsequently output compressed data of the second bank through the one interface pad.
Claims25
A memory device, comprising:
- a first bank;
- a second bank;
- a plurality of interface pads;
- and
- a data output unit configured to sequentially output compressed data of the first bank through one interface pad among the plurality of interface pads and subsequently output compressed data of the second bank through the one interface pad,
- wherein output timings of the compressed data of the first bank and the compressed data of the second bank to the one interface pad are determined in response to a read command and the one interface pad is selected based on the read command.
3 more elements
A memory device, comprising:
- a plurality of bank groups each including at least one bank;
- a plurality of interface pads;
- and
- a data output unit configured to output compressed data of one bank group from among the plurality of bank groups to at least one interface pad from among the plurality of interface pads at once during a compressive test operation, wherein compressed data of different bank groups from among the plurality of bank groups are sequentially outputted,
- wherein output timings of the compressed data of the plurality of bank groups to the at least one interface pad are determined in response to a read command and the one interface pad is selected based on the read command.
2 more elements
A method for testing a memory device, comprising:
- applying a first read command;
- reading data from a first bank and data from a second bank in response to the first read command;
- compressing the data read from the first bank and the data read from the second bank to thereby produce a first compressed data and a second compressed data;
- outputting the first compressed data of the first bank to at least one interface pad from among a plurality of interface pads in response to the first read command;
- applying a second read command;
- and
- outputting the second compressed data of the second bank to the at least one interface pad in response to an activation of the second read command,
- wherein output timings of the first compressed data of the first bank and the second compressed data of the second bank to the one interface pad are determined in response to a read command and the one interface pad is selected based on the read command.
5 more elements
A method for testing a memory device, comprising:
- applying a first read command;
- reading data from a plurality of banks in response to the first read command;
- compressing the data read from the plurality of banks;
- outputting a first compressed data of at least one bank from among the plurality of banks to at least one interface pad in response to the first read command, wherein the one interface pad is selected based on the first read command;
- applying a second read command;
- and
- outputting a second compressed data of at least one other bank from among the plurality of banks to the at least one interface pad in response to the second activation of the second read command,
- wherein output timings of the first compressed data and the second of the plurality of bank to the at least one interface pad are determined in response to the first and second read commands.
5 more elements
A memory system comprising:
- a bank controller configured to receive a bank address and a test signal, and to transfer a read command in response to the bank address and test signal;
- a plurality of banks configured to receive the read command and output normal data;
- a plurality of compression circuits configured to receive the normal data and generate compressed data when the test signal is enabled;
- a plurality of global lines configured to load and transfer the normal data or the compression data;
- a plurality of interface pads, wherein a interface pad from among the plurality of interface pads is selected based on the read command as a selected interface pad and is coupled to test equipment;
- and
- a data output unit configured to receive data loaded onto the plurality of global lines, to output compressed data of at least one bank from among the plurality of banks through the selected interface pad, and to subsequently output compressed data of at least one other bank from among the plurality of banks through the selected interface pad,
- wherein output timings of the compressed data of the plurality of bank to the selected interface pad are determined in response to a read command.
5 more elements
Dependencies are inferred from the claim text.