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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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PC97307 датащи(PDF) 208 Page - National Semiconductor (TI) |
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PC97307 датащи(HTML) 208 Page - National Semiconductor (TI) |
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208 / 218 page  208 Device Description www.national.com 13.3.18 Enhanced Parallel Port 1.9 Timing TABLE 13-54. Enhanced Parallel Port 1.9 Timing Parameters FIGURE 13-25. Enhanced Parallel Port 1.9 Timing a. When WAIT is low, tWST19a and tWW19a are measured after WR or RD becomes active; else tWST19a and tWW19a are measured after WAIT becomes low. b. The design guarantees that WRITE will not change from low to high before DSTRB, or ASTRB, goes from low to high. c. D7-0 is stable 15 nsec before WR becomes active. Symbol Parameter Notes Min Max Unit tWW119a WRITE Active from WR Active or WAIT Low a 45 nsec tWW19ia WRITE Inactive from WAIT Low 45 nsec tWST19a DSTRB or ASTRB Active from WR or RD Active or WAIT Low a b 65 nsec tWST19ia DSTRB or ASTRB Inactive from WR or RD High 45 nsec tWEST19 DSTRB or ASTRB Active after WRITE Active 10 nsec tWPD19h PD7-0 Hold after WRITE Inactive 0 nsec tHRW19 IOCHRDY Active after WR or RD Active or Inactive after WAIT High 40 nsec tWPDS19 PD7-0 Valid after WRITE Active c 15 nsec tEPDW19 PD7-0 Valid Width 80 nsec tEPD19h PD7-0 Hold after DSTRB or ASTRB Inactive 0 nsec tZWS19a ZWS Valid after WR or RD Active 45 nsec tZWS19h ZWS Hold after WR or RD Inactive 0 nsec WR RD D7-0 WRITE DSTRB ASTRB PD7-0 WAIT IOCHRDY Valid Valid tWST19a tHRW19 tHRW19 tWST19a tWW19ia tWPD19h tWST19ia tEPD19h tEPDW19 or tHRW19 tZWS19a tZWS19h tZWS19a tZWS19h ZWS tWW19a tWST19ia tWST19a {Note a} {Note a} tWW19a {Note a} tHRW19 tWPDS19 tWEST19 tWST19a |
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