Flash memory blocking architecture

Claim 1

A memory device having a plurality of electrically programmable and electrically erasable memory cells each having a source region, drain region and control gate, the memory device comprising: two memory arrays, each array divided into multiple blocks wherein each block has a plurality of generally parallel bit lines coupled to the drain regions of the memory cells within the block such that each of the two memory arrays comprise five blocks wherein four of the five blocks comprise 112 bit lines each and a remaining one of the five blocks comprises 64 bit lines, each of the two memory arrays being arranged such that each of the four 112 bit line blocks are contiguous and each 64 bit line block is located between four contiguous 112 bit line blocks; word lines, generally perpendicular to the bit lines, coupled to the control gates of one cell in each bit line; row decoder means located between the two arrays and between the 64 bit line blocks of each of the two arrays, the row decoder means decoding row addresses and selecting word lines such that when one of the word lines is selected the potential on the control gates along the word line in all of the blocks is changed: column decoder means for decoding column addresses and for selecting bit lines such that when any of the bit lines are selected the potential on the drain regions connected to the bit lines is changed, the column decoder including: one 1:16 decoder for outputting a first decoder signal in response to a column address where the 1:16 decoder is located between the first array and the second array; seven 1:16 selectors coupled to the first 112 bit line block of the first array for outputting 7 selected bit line signals in response to the first decoder signal; seven 1:16 selectors coupled to the second 112 bit line block of the first array for outputting 7 selected bit line signals in response to the first decoder signal; seven 1:16 selectors coupled to the third 112 bit line block of the first array for outputting 7 selected bit line signals in response to the first decoder signal; seven 1:16 selectors coupled to the fourth 112 bit line block of the first array for outputting 7 selected bit line signals in response to the first decoder signal; eight 1:8 selectors coupled to the 64 bit line block of the first array for outputting 8 selected bit line signals in response to the first decoder signal; eight 1:8 selectors coupled to the 64 bit line block of the second array for outputting 8 selected bit line signals in response to the first decoder signal; seven 1:16 selectors coupled to the first 112 bit line block of the second array for outputting 7 selected bit line signals in response to the first decoder signal; seven 1:16 selectors coupled to the second 112 bit line block of the second array for outputting 7 selected bit line signals in response the first decoder signal; seven 1:16 selectors coupled to the third 112 bit line block of the second array for outputting 7 selected bit line signals in response to the first decoder signal; seven 1:16 selectors coupled to the fourth 112 bit line block of the second array for outputting 7 selected bit line signals in response the first decoder signal; one 1:8 decoder for outputting a second decoder signal in response to a column address wherein the 1:8 decoder is located between the first array and the second array; one 1:8 selector coupled to receive the 7 selected bit line signals from the seven 1:16 selectors from the first 112 bit line block of the first array, and to receive a selected bit line signal from the first of the eight 1:8 selectors from the 64 bit line block of the first array and the first of the eight 1:8 selectors from the 64 bit block of the second array, for outputting 1 selected signal in response to the second decoder signal; one 1:8 selector coupled to receive the 7 selected bit line signals from the seven 1:16 selectors from the second 112 bit line block of the first array, and to receive a selected bit line signal from the second of the eight 1:8 selects from the 64 bit line block of the first array and the second of the eight 1:8 selectors from the 64 bit line block of the second array, for outputting 1 selected signal in response to the second decoder signal; one 1:8 selector coupled to receive the 7 selected bit line signals from the seven 1:16 selectors from the third 112 bit block of the first array, ad to receive a selected bit line signal from the third of the eight 1:8 selectors from the 64 bit line block of the first aray and the third of the eight 1:8 selectors from the 64 bit line block of the second array, for outputting 1 selected signal in response to the second decoder signal; one 1:8 selector coupled to receive the 7 selected bit line signals from the seven 1:16 selectors from the fourth 112 bit line block of the first array, and to receive a selected bit line signal from the fourth of the eight 1:8 selectors from the 64 bit line block of the first array and the fourth of the eight 1:8 selectors from the 64 bit block of the second array, for outputting 1 selected signal in response to the second decoder signal. one 1:8 selector coupled to receive the 7 selected bit line signals from the seven 1:16 selectors from the first 112 bit line block of the second array, and to receive a selected bit line signal from the fifth of the eight 1:8 selectors from the 64 bit line block of the first array and the fifth of the eight 1:8 selectors from the 64 bit line block of the second array, for outputting 1 selected signal in response to the second decoder signal; one 1:8 selector coupled to receive the 7 selected bit line signals from the seven 1:16 selectors from the seond 112 bit line block of the second array, and to receive a selected bit line signal from the sixth of the eight 1:8 selectors from the 64 bit line block of the first array and the sixth of the eight 1:8 selectors from the 64 bit line block of the second array, for outputting 1 selected signal in response to the second decoder signal; one 1:8 selector coupled to receive the 7 selected bit lie signals from the seven 1:16 selectors from the third 112 bit line block of the second array, and to receive a selected bit line signal from the seventh of the eight 1:8 selectors from the 64 bit line block of the first array and the seven of the eight 1:8 selectors from the 64 bit line block of the second array, for outputting 1 selected signal in response the second decoder signal; one 1:8 selector coupled to receive the 7 selected bit line signals from the seven 1:16 selectors from the fourth 112 bit line block of the second array, and to receive a selected bit line signal from the eighth of the eight 1:8 selectors from the 64 bit line block of the first array and the eighth 1:8 selectors from the 64 bit line block of the second array, for outputting 1 selected signal in response the second decoder signal; and source switching means for connecting the source regions of the cells in each block such that the potential on the source in a selected block is changed.