Datasheet

5–5
5.6 Extension Window Enable Register
The decode of the extension windows is enabled through bits 0 and 1 of this register. See Table 5–4 for a complete
description of the register contents.
Bit 7 6 5 4 3 2 1 0
Name Extension window enable
Type R R R R R R R/W R/W
Default 0 0 0 0 0 0 0 0
Register: Extension window enable
Type: Read-only, Read/Write
Offset: 54h
Default: 00h
Table 5–4. Extension Window Enable Register
BIT TYPE FUNCTION
7–2 R Reserved. Bits 7–2 return 0s when read.
1 R/W
Extension window 1 interface enable
0 = Disable window 1 (default)
1 = Enable window 1
0 R/W
Extension window 0 interface enable
0 = Disable window 0 (default)
1 = Enable window 0
5.7 Extension Window Map Register
The inclusion or exclusion of the extension windows on the primary interface is selected through bits 0 and 1 of this
register. The bit descriptions discuss the decode in reference to the primary interface. The secondary interface is the
negative decode of the primary interface. Regions excluded on the primary interface can be positively decoded on
the secondary interface if negative decoding is disabled on the secondary interface. See Table 5–5 for a complete
description of the register contents.
Bit 7 6 5 4 3 2 1 0
Name Extension window map
Type R R R R R R R/W R/W
Default 0 0 0 0 0 0 0 0
Register: Extension window map
Type: Read-only, Read/Write
Offset: 55h
Default: 00h
Table 5–5. Extension Window Map Register
BIT TYPE FUNCTION
7–2 R Reserved. Bits 7–2 return 0s when read.
1 R/W
Extension window 1 interface include/exclude
0 = Extension window 1 included in primary interface decode (default)
1 = Extension window 1 excluded in primary interface decode
0 R/W
Extension window 0 interface include/exclude
0 = Extension window 0 included in primary interface decode (default)
1 = Extension window 0 excluded in primary interface decode