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US 7,013,413 B1Granted
Method for compressing output data and a packet command driving type memory device
AssigneeHyundai Electronics Industries Co., Ltd.
InventorsSung Wook Kim, In Hong Kim
Life of this patent
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Abstract
The present invention relates to a packet command driving type memory device, a method for compressing output data according to the present invention is characterized to write first data of a certain bit in a corresponding address of core cell regions, read the first data of a certain bit written in the address, compare the written data and the read data by dividing it to an upper certain bit and a lower certain bit, generate compressed data of 1 bit with an information about whether a fail is.
Claims8
A method for compressing output data comprising:
- reading a first data from a core cell region and prefetching the first data having a first number of bits in a normal mode;
- writing the first data of the first number of bits into an address of the core cell region in a test mode;
- reading the first data written into the address of the core cell region and prefetching the read data;
- comprising the first data and the read data by dividing each of the first data and the read data into an upper portion having a second number of bits and a lower portion having a remaining member of bits;
- and
- compressing a result from the comparing to generate a compressed dam with information indicating whether a failure is present;
- selecting a selected data from the prefetched first data in a normal mode and the compressed data in a test mode;
- shifting the selected data at an ascending edge and a descending edge of a clock signal and outputting the selected data serially via one or more output pads in a normal mode;
- shifting the selected data at an ascending edge and a descending edge of the clock signal and outputting the selected data serially via one of the one or mole output pads in a test mode, wherein
- the first number of bits associated with the prefetched first data, first data, and the read data is 8;
- the second number of bits associated with the upper portion is 4;
- the remaining number of bits associated with the lower portion is 4;
- and
- the compressed data is 1-bit signal.
11 more elements
A packet command drip type memory device comprising:
- a read data comparing part capable of receiving a first data and a read dam from a core cell region, both the first data and the read data having a first number of bits, comparing the first data with the tea data and generating a compressed data having a second number of bits;
- a data input/output pan capable of transforming the compressed data and the read data to produce more than one data part;
- an interface part capable of serially outputting the data pans from the data input/output part in a packet form via an output pad, wherein
- the first number of bits associated with the first data and the read data is 8;
- the first data and the read data are divided into, during said comparing, an upper 4 bit portion and a lower 4-bit portion;
- the second number of bits associated with the compressed data is 2 bits, the read data comparing part compressing the upper 4 bit portions of the first data and the read data into a first 1-bit signal of the compressed data and the lower 4-bit portions of the first data and the read data into a second 1-bit signal of the compressed data;
- and
- the data parts include an even-bit data part and an odd-bit data part.
5 more elements
A packet command driving type memory device comprising:
- a read data comparing part capable of receiving a first data and a read data from a core cell region, both the first data and the read data having a first number of bits comparing the first data with the read data, and generating a compressed data having a second number of bits;
- a data input/output part capable of transforming the compressed data and the read data to produce more than one data part;
- an interface part capable of serially outputting the data parts from the data input/output part in a packet form via an output pad, wherein the read data comparing part comprises:
- plurality of comparators, each of which capable of receiving and comparing corresponding portions of the first data and the read data to generate a 1-bit compressed data indicating whether a failure is present;
- and
- a selecting means capable of selecting the read data in a normal mode and the compressed data generated by one of tee plurality of comparators in a test mode.
3 more elements
A packet command driving type memory device comprising:
- plurality of comparators for receiving and comparing 8-bit data read from a core cell region and generating compressed data, wherein each of the comparators is capable of
- receiving 4 bits of an 8-bit first data and 4 bits of an 8-bit prefetched data read from an address of the core cell region where the first data is writ the received 4 bits of the first data being one of a 4-bit upper portion and a 4 bit lower portion of the first data and the received 4 bits of the prefetched data being one of a 4-bit upper portion and a 4-bit lower portion of the prefetched data,
- comparing the 4 bits of the first data and the 4 bits of the prefetched data in a test mode, and
- generating a 1-bit compressed data based on a result of the comparing with information indicating whether a failure is present;
- and
- a selecting means capable of selecting the 8-bit prefetched data in a normal mode and the compressed data from the plurality of comparators in the test mode.
3 more elements
A packet command driving type memory device comprising:
- a read data comparing pant having a plurality of comparators capable of
- receiving an 8-bit first data and an 8-bit prefetched data read from an address of a core cell region where the first dam is written,
- comparing tee received fast data with tae prefetched data by coming, via each of the plurality of comparators, corresponding upper and lower 4 bits of the 8-bit first data and the 8-bit prefetched data in a test mode, and
- generating, by each of the plurality of comparators, a 1-bit compressed data for each of the comparing performed based on corresponding 4 bits portions of the first data and the prefetched data,
- selecting a selected data from the 8-bit prefetched data in a normal mode and the compressed data from the plurality of compass in a test mode;
- a data input/output part capable of transforming the selected data into more than one data parts;
- and
- an interface part capable of serially outputting the data pas of the selected data from the data input/output part.
5 more elements
Dependencies are inferred from the claim text.