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74LCX32646GX bảng dữ liệu(PDF) 6 Page - Fairchild Semiconductor |
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74LCX32646GX bảng dữ liệu(HTML) 6 Page - Fairchild Semiconductor |
6 / 11 page Preliminary www.fairchildsemi.com 6 Functional Description In the transceiver mode, data present at the HIGH imped- ance port may be stored in either the A or B register or both. The select (SABn, SBAn) controls can multiplex stored and real-time. The examples shown below demon- strate the four fundamental bus-management functions that can be performed for data I/O 1A and 1B: 0 - 7. The direction control (DIRn) determines which bus will receive data when OEn is LOW. In the isolation mode (OEn HIGH), A data may be stored in one register and/or B data may be stored in the other register. When an output func- tion is disabled, the input function is still enabled and may be used to store and transmit data. Only one of the two busses, A or B, may be driven at a time. Real-Time Transfer Bus B to Bus A Real-Time Transfer Bus A to Bus B Transfer Storage Data to A or B Storage OE1 DIR1 CPAB1 CPBA1 SAB1 SBA1 L L XXX L OE1 DIR1 CPAB1 CPBA1 SAB1 SBA1 LH X X L X OE1 DIR1 CPAB1 CPBA1 SAB1 SBA1 LL X H or L X H LH H or L X H X OE1 DIR1 CPAB1 CPBA1 SAB1 SBA1 LH XL X LX X XL HX XXX HX X XX |
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