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전자부품 데이터시트 검색엔진 |
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전자부품 데이터시트 검색엔진 |
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CS5530A 데이터시트(PDF) 88 Page - National Semiconductor (TI) |
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CS5530A 데이터시트(HTML) 88 Page - National Semiconductor (TI) |
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88 / 259 page  www.national.com 88 Revision 1.1 Functional Description (Continued) 3.5.2 ISA Bus Interface The ISA bus controller issues multiple ISA cycles to satisfy PCI transactions that are larger than 16 bits. A full 32-bit read or write results in two 16-bit ISA transactions or four 8- bit ISA transactions. The ISA controller gathers the data from multiple ISA read cycles and returns TRDY# only after all of the data can be presented to the PCI bus at the same time. SA[23:0] are a concatenation of ISA LA[23:17] and SA[19:0] and perform equivalent functionality at a reduced pin count. Figure 3-8 shows the relationship between a PCI cycle and the corresponding ISA cycle generated. Figure 3-8. Non-Posted PCI-to-ISA Access PCI_CLK ISACLK FRAME# IRDY# TRDY# AD[31:0] (Read) IOR#/IOW# AD[31:0] (Write) BALE STOP# MEMR#/MEMW# |
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