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DP8496 Datasheet(PDF) 88 Page - National Semiconductor (TI) |
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DP8496 Datasheet(HTML) 88 Page - National Semiconductor (TI) |
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88 / 92 page  70 AC Specifications (Continued) 731 SCSI SYNCHRONOUS INFORMATION OUT PHASE AS INITIATOR TLF11212 – 65 ID Symbol Parameter Min Max Units 311 reqap REQ Assertion Period 20 ns 312 reqdp REQ Deassertion Period 20 ns 313 sydh Synchronous Data Hold (Note 2) (Note 2) ns 314 syds Synchronous Data Setup (Note 1) (Note 1) ns 315 ackap ACK Assertion Period (Note 3) (Note 3) ns 316 ackdp ACK Deassertion Period (Note 3) (Note 3) ns Note 1 The setup time is programmable The following equations determine these typical times For n e 2 bcp-k For n e 4 6 (05 (n b 2) bcp a bc)-k where bc is bcl or bch For n Odd (05 (n b 1) bcp)-k Note 2 The hold time is programmable The following equations determine these typical times For n e 2 bcp-k For n e 4 6 (05 n bcp a bc)-k where bc is bcl or bch For n Odd (05 (n a 1) bcp)-k Note 3 The ACK assertion and deassertion time is programmable The following equations determine these typical times For n Even (05 n bcp)-k For n Odd (05 (n b 1) bcp a bc)-k where bc is bcl or bch k is a characterization constanttarget value for which is 10 ns All SCSI signals are active-high on the DP8497 732 SCSI SYNCHRONOUS INFORMATION OUT PHASE AS TARGET TLF11212 – 66 ID Symbol Parameter Min Max Units 321 reqap REQ Assertion Period (Note 1) ns 322 reqdp REQ Deassertion Period (Note 1) ns 323 sydh Synchronous Data Hold 20 ns 324 syds Synchronous Data Setup 0 ns 325 ackap ACK Assertion Period 20 ns 326 ackdp ACK Deassertion Period 20 ns Note 1 The REQ assertion and deassertion time is programmable The following equations determine these typical times For n even (05 n bcp)-k For n odd (05 (n b 1) bcp a bc)-k where bc is bcl or bch k is a characterization constanttarget value for which is 10 ns 88 |
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