Skip to main content
Renesas Electronics Europe - Knowledgebase

How can I be sure that mask files have been correctly generated?

Latest Updated:09/15/2006


When mask files are generated from two programs that contain just one differing table data, the file codes for both mask files are the same. How can I be sure that the mask files have been correctly generated?


A unique file code is not necessarily generated for each mask file. The file code should be considered as just one piece of data for confirming the integrity of the mask file and the mask ROM confirmation form during the mask processing operation.
The file code is derived from the addition of all data recorded in the mask file, in 1-byte units of unsigned 32-bit length. In addition, a check sum is added to each data that is set in the mask file. Therefore, if a part of the contents of the set data differs, the value of the check sum for the differing data will also differ. Yet the file code itself may not indicate this difference in the contents of the set data.
Suitable Products
Maskfile Converter
4500 Series ROM Ordering
720 Series ROM Ordering
38000 Series ROM Ordering
740/7450/7470 Series ROM Ordering
7600 Series ROM Ordering
7200 Series ROM Ordering
7770 Series ROM Ordering
M16C Family ROM Ordering
R8C Family ROM Programmed Shipment Ordering
QzROM Programmed Shipment Ordering
ASSP ROM Ordering
OSD Controller ROM Ordering