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Bitfields for Intel 82378/82379 ISA Address Decoder Control Register

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Bit Description

7 - 4

 ISA memory cycle forwarding to PCI
0000-1111 = 1M-16M top of ISA memory; any accesses above programmed limit are forwarded to PCI bus

3 - 0

 ISA/DMA memory cycle to PCI bus enables
bit 3 : 896K-960K (E000h-EFFFh)
bit 2 : 640K-768K (A000h-BFFFh)
bit 1 : 512K-640K (8000h-9FFFh)
bit 0 : 0K-512K (0000h-7FFFh)

See Also:

#01064,#01070