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3.2.8. ColumnWidth field, MBIR[3:2]

The ColumnWidth field specifies the number of columns in each block of RAM in the array under test. The column address is always encoded in the least significant bits of the RAM address, so the number of columns determines the number of bits used. This information is important for the correct operation of certain MBIST operations, for example bit-line stress testing and writing a true physical checkerboard pattern to the array.

Table 3.10 shows the supported column widths along with the number of LSB address bits used for each and the MBIR encodings required to select them.

Table 3.10. ColumnWidth field encoding
ColumnWidth MBIR[3:2]Number of columnsNumber of address bits
b0042
b0183
b10164
b11325

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