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전자부품 데이터시트 검색엔진 |
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전자부품 데이터시트 검색엔진 |
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AM79C975 데이터시트(PDF) 92 Page - Advanced Micro Devices |
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AM79C975 데이터시트(HTML) 92 Page - Advanced Micro Devices |
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92 / 304 page  92 Am79C973/Am79C975 P R E L I M INARY Am79C975 controller will not react to any access to the Expansion ROM until both MEMEN (PCI Command reg- ister, bit 1) and ROMEN (PCI Expansion ROM Base Address register, bit 0) are set to 1. After the Expansion ROM is enabled, the Am79C973/Am79C975 controller will claim all memory read accesses with an address between ROMBASE and ROMBASE + 1M - 4 (ROM- BASE, PCI Expansion ROM Base Address register, bits 31-20). The address output to the Expansion ROM is the offset from the address on the PCI bus to ROM- BASE. The Am79C973/Am79C975 controller aliases all accesses to the Expansion ROM of the command types Memory Read Multiple and Memory Read Line to the basic Memory Read command. Figure 41. EPROM Only Configuration for the Expansion Bus (64K EPROM) EBUA_EBA[7:0] EBDA[15:8] EBD[7:0] EBWE EROMCS A[15:8] A[7:0] DQ[7:0] OE CS Am79C973 EPROM AS_EBOE 21510D-46 |
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