7

Test Patterns

MARCH (II) PATTERN

After a background of zeros is written, each cell (from

beginning to end in sequence) is read, written to a one and

reread. When the array is full of ones each cell (from the end

to the beginning) is read, restored to a zero and reread.

After this the pattern is repeated but with complemented

data.

MASEST PATTERN (Multiple Address Select

Pattern)

A checkerboard pattern is written into the memory. Then the

first cell is read, then its binary address complement is read.

The second cell is read and then its binary address

complement is read. This pattern of incrementing the

address and then reading its binary address complement is

repeated until the entire memory is read.

This is then repeated but using a checkerboard bar pattern.

GALROW PATTERN (Row Galloping Pattern)

After a background of zeros is written into the memory a one

is written into the first cell. It is then read alternately with

each other cell in the row. The test cell is then rewritten back

to a zero. The test cell is then incremented and the

sequence is repeated until all cells in the memory have been

used as a test cell.

This is pattern then repeated but using complemented data.

GALCOL PATTERN (Column Galloping Pattern)

After a background of zeros is written into the memory a one

is written into the first cell. It is then read alternately with

each other cell in the column. The test cell is then rewritten

back to a zero. The test cell is then incremented and the

sequence is repeated until all cells in the memory have been

used as a test cell.

This is pattern then repeated but using complemented data.

CHECKERBOARD PATTERN and

CHECKERBOARD BAR

A checkerboard is written (101010) into the memory and

then the pattern is read back. This is then repeated but using

complemented data.

Irradiation Circuit

HS-65647RH (8K x 8 TSOS4 SRAM) 28 LEAD CERAMIC DIP

NOTES:

17. VDD = 5.5V

±0.5V R = 10kΩ±10%.

18. Group E sample size is two die/wafer.

28

27

26

25

24

23

22

21

20

19

18

17

16

15

1

2

3

4

5

6

7

8

9

10

11

12

13

14

NC

VDD

NC

A12

A7

A6

A5

A4

A3

A2

A1

A0

DQ0

DQ1

DQ2

VSS

VDD

E2

A8

A9

A11

A10

DQ7

DQ6

DQ5

DQ4

DQ3

W

G

E1

HS-65647RH