82375EB datasheet(97/131 Pages) INTEL

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82375EB датащи(PDF) 97 Page - Intel Corporation

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82375EBSB

60 DATA BUFFERING

The PCEB contains data buffers (Figure 24) to isolate the PCI Bus from the EISA Bus and to provide concur-

rent EISA and PCI Bus operations and APIC operations The Line Buffers are used for EISA-to-PCI memory

reads and writes A control bit in the EPMRA Registers permis the Line Buffers to be enabled (accesses are

buffered) or disabled (accesses are non-buffered) Non-buffered accesses use the bypass path Note that PCI

and EISA IO readwrite cycles and PCI configuration cycles are always non-buffered and use the bypass

path

When data is temporarily stored in the buffers between the EISA Bus and PCI Bus there are potential data

coherency issues The PCEB guarantees data coherency by intervening when data coherency could be lost

and either flushing or invalidating the buffered data as appropriate

290477 – 67

Figure 24 PCEB Data Buffers

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