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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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82374EB датащи(PDF) 39 Page - Intel Corporation |
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82374EB датащи(HTML) 39 Page - Intel Corporation |
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39 / 208 page  82374EB82374SB 315 BIOSCSBBIOS CHIP SELECT B REGISTER Address Offset 43h Default Value 00h Attribute ReadWrite Size 8 Bits The LBIOSCS signal is used to decode access to the motherboard BIOS The ESC decodes memory access to the following address ranges and if the range has been enabled the LBIOSCS signal is always asserted for memory reads in the enabled BIOS range If the BIOS Write Enable bit is set in the configuration register BIOSCSB the LBIOSCS is also asserted for memory write cycles Bit Description 74 Reserved 3 BIOS Write Enable When enabled LBIOSCS is asserted for memory read AND write cycles for addresses in the decoded and enabled BIOS range otherwise LBIOSCS is asserted for memory read cycles ONLY 2 16 Meg BIOS During Memory access to locations FF0000h – FFFFFFh with this bit set LBIOSCS will be asserted for memory read cycles If bit 3 of BIOSCSB is set then LBIOSCS will be asserted for write cycles as well 1 High VGA BIOS During Memory access to locations 0C4000h – 0C7FFFh with this bit set LBIOSCS will be asserted for memory read cycles If bit 3 of BIOSCSB is set then LBIOSCS will be asserted for write cycles as well 0 Low VGA BIOS During Memory access to locations 0C0000h – 0C3FFFh with this bit set LBIOSCS will be asserted for memory read cycles If bit 3 of BIOSCSB is set then LBIOSCS will be asserted for write cycles as well 39 |
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