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STV0974 数据表(PDF) 58 Page - STMicroelectronics |
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STV0974 数据表(HTML) 58 Page - STMicroelectronics |
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58 / 69 page  58/61 STV0974 Electrical characteristics 5.5.4 Video output timing 5.5.5 Microprocessor read/write timing Table 41: Video output timing ( Figure 33) Symbol Parameter Min. Typ. Max. Unit tDS Data and synchro setup timea a. with a 12 pF capacitance 10 ns tDH Data and synchro hold time a 10 ns tCKH Clock pulse width high a 16 ns tCKP Clock period a 44 ns tCKR Clock rise timea 5ns Figure 33: Video output timing Table 42: Microprocessor read and write cycle timingv Symbol Parameter Min. Typ. Max. Unit tAS RS, CSN valid to RDN or WRN low 7 ns tAH RS, CSN hold after RDN or WRN high 7 ns tRACC Read access time 40 ns tLZ RDN high to data high impedance 15 ns tRP Read pulse width 40 ns tWP Write pulse width 45 ns tWDS Data setup to WRN high 35 ns tRREC Read recovery time 30 ns tWREC Write recovery time 22 ns tZL RDN low to data low impedance 0 ns tRDH RDN low to data invalid 0 ns tWDH Data hold after WRN high 5 ns Data[7:0] tDS tCKH tDH tCKP hsync/vsync hclk tCKR |
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