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PC87373 数据表(PDF) 167 Page - National Semiconductor (TI) |
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PC87373 数据表(HTML) 167 Page - National Semiconductor (TI) |
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167 / 174 page ![]() 13.0 Device Characteristics (Continued) 167 www.national.com Revision 1.1 13.4.6 Parallel Port Timing Standard Parallel Port Timing Enhanced Parallel Port Timing Symbol Parameter Conditions Min Max Unit tPDH Port Data Hold SPP Mode 0 and Mode 1, ECP Mode 0 and Mode1: system dependent; ECP Mode 2: device dependent. 750 ns tPDS Port Data Setup SPP Mode 0 and Mode 1, ECP Mode 0 and Mode1: system dependent; ECP Mode 2: device dependent. 750 ns tSW Strobe Width SPP Mode 0 and Mode 1, ECP Mode 0 and Mode1: system dependent; ECP Mode 2: device dependent. 750 ns Symbol Parameter Min Max EPP 1.71 1. Also in ECP Mode 4 EPP 1.91 Unit tWW19a WRITE Active from WAIT Low 45 ✔ ns tWW19ia WRITE Inactive from WAIT Low 45 ✔ ns tWST19a DSTRB or ASTRB Active from WAIT Low 65 ✔ ns tWEST DSTRB or ASTRB Active after WRITE Active 10 ✔✔ ns tWPDH PD7 −0 Hold after WRITE Inactive 0 ✔✔ ns tWPDS PD7 −0 Valid after WRITE Active 15 ✔✔ ns tEPDW PD7 −0 Valid Width 80 ✔✔ ns tEPDH PD7 −0 Hold after DSTRB or ASTRB Inactive 0 ✔✔ ns tPDS tPDH tSW BUSY ACK PD7 −0 STB WRITE DSTRB ASTRB PD7 −0 WAIT Valid tWW19ia tWPDH tEPDH tEPDW or tWW19a tWST19a tWPDS tWEST tWST19a |
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