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82375EB Datasheet(PDF) 57 Page - Intel Corporation |
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82375EB Datasheet(HTML) 57 Page - Intel Corporation |
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57 / 131 page  82375EBSB 4141 ESC Resident PIC Registers Access to the 8259 registers are positively decoded if enabled through PDCON Register to minimize access time to the system interrupt controller during interrupt processing (in particular during the EOI command sequence) Table 3 shows the 8259 IO address map After PCIRST positively decoded access to these address ranges is disabled Table 3 ESC Resident Programmable Interrupt Controller (PIC) Registers Address Address Address Address Address Access (hex) Bits Bits Bits Bits Type Register Name FEDC BA98 7654 3210 0020h 0000 0000 001x xx00 RW INT 1 Control 0021h 0000 0000 001x xx01 RW INT 1 Mask 00A0h 0000 0000 101x xx00 RW INT 2 Control 00A1h 0000 0000 101x xx01 RW INT 2 Mask 4142 EISA Resident IDE Registers The PCI address decoder positively decodes IDE IO addresses (Primary and Secondary IDE) that exist within the EISA subsystem (typically on the X-bus or as an ISA slave) This feature is implemented to minimize the decoding penalty for the systems that use IDE as a mass-storage controller Table 4 shows IDE’s IO address map Note that the PDCON Register controls the enabledisable function for IDE decoding After PCIRST positive decode of the IDE address range is disabled Table 4 EISA Resident IDE Registers Address (hex) Addess (Bits) Access Type Register Name FEDC BA98 7654 3210 0170h 0000 0001 0111 0000 RW Secondary Data Register 0171h 0000 0001 0111 0001 RW Secondary Error Register 0172h 0000 0001 0111 0010 RW Secondary Sector Count Register 0173h 0000 0001 0111 0011 RW Secondary Sector Number Register 0174h 0000 0001 0111 0100 RW Secondary Cylinder Low Register 0175h 0000 0001 0111 0101 RW Secondary Cylinder High Register 0176h 0000 0001 0111 0110 RW Secondary Drivehead Register 0177h 0000 0001 0111 0111 RW Secondary Status Register 01F0h 0000 0001 1111 0000 RW Primary IDE Data Register 01F1h 0000 0001 1111 0001 RW Primary Error Register 01F2h 0000 0001 1111 0010 RW Primary Sector Count Register 01F3h 0000 0001 1111 0011 RW Primary Sector Number Register 57 |
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