Bit field for AT_PDE_CONTENTATTRS.
Values:
| IG_PDE_SET_CACHE_DEVICE | 0x0001 | If set, cacheDevice contains 6 cache device values. |
| IG_PDE_SET_CHAR_WIDTH | 0x0002 | If set, cacheDevice contains 2 charwidth values. |
| IG_PDE_FORM_MATRIX | 0x0004 | If set, formMatrix contains a valid matrix. |