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Zakładka z wyszukiwarką danych komponentów |
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Zakładka z wyszukiwarką danych komponentów |
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PC87591L Arkusz danych(PDF) 74 Page - National Semiconductor (TI) |
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PC87591L Arkusz danych(HTML) 74 Page - National Semiconductor (TI) |
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74 / 437 page  4.0 Embedded Controller Modules (Continued) www.national.com 74 Revision 1.07 4.1.5 Late Write Bus Cycle If EWR in BCFG register is 0, the BIU uses the late write bus cycle. The basic late write bus cycle takes two clock cycles. This write bus cycle requires the RD signal in the memory device interface. A write bus cycle starts at T1. When the data bus is in TRI-STATE, the address is placed on the address bus and SELn (or SELIO) is activated. Next, WR0-1 are activated. RD is inactive to indicate this is a write transaction. CLK A0-19 SELx SELy RD WR0-1 D0-15 Normal Read Early Write Read, T1 T2 T1 T2 T1 T2 All Other Zones T3 In In BST0-2 (Note) (x ≠ y) (y ≠ x) Out Figure 13. Early Write Following Normal Read with 0 Wait Bus State CLK A0-19 SELn RD WR0-1 D0-15 T1 TIW T2 T3 THold Out BST0-2 Figure 14. Early Write Bus Cycle with 1 Internal Wait and 1 Hold Bus State |
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