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DP8496 Datasheet(PDF) 76 Page - National Semiconductor (TI) |
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DP8496 Datasheet(HTML) 76 Page - National Semiconductor (TI) |
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76 / 92 page  70 AC Specifications (Continued) ID Symbol Parameter Formula BCLK e 20 MHz Units Min Max Min Max 111 crasa BCLK to RAS Asserted 30 ns 112 crasd BCLK to RAS and CAS Deasserted 30 ns 113 rc ReadWrite Cycle Time Single xfr 5 bcp 250 4x Burst 9 bcp 450 ns 6x Burst 12 bcp 600 114 ras RAS WR Pulse Width Single xfr 2 bcp a bcl b 10 3 bcp b 10 112 140 4x Burst 7 bcp b 57 bcp a 5 345 355 ns 6x Burst 10 bcp b 10 10 bcp a 10 490 510 115 rp RAS Precharge Time 2 bcp b 595 ns 116 rcd RAS to CAS Delay Time bcp a bcl b 10 bcp a bcl b 10 62 68 ns 117 cas CAS Pulse Width bcp b 5 bcp a 545 55 ns 118 cpcpn CAS Precharge Time bcl b 517 ns 119 asr Row Address Setup Time bch b 10 12 ns 1110 rah Row Address Hold Time bcp b 10 40 ns 1111 asc Column Address Setup Time bch b 10 12 ns 1112 cah Column Address Hold Time bcp b 10 40 ns 1113 rac Access Time from RAS (Read Only) 2 bcp a bcl b 10 112 ns 1114 cac Access Time from CAS (Read Only) bcp b 10 40 ns 1115 off Data Hold from CAS High (Read) 0 bcp a bcl 0 78 ns 1116 ds Data Setup (Write Only) bcmin b 10 32 ns 1117 dhr Data Hold from RAS (Write Only) 2 bcp a bcl b 10 112 ns 1118 dh Data Hold from CAS (Write Only) bcp b 10 40 ns 1119 pc Fast Page Mode Cycle Time bcp a bcl b 10 62 ns 1120 aa Access Time from Column Address bcp a bcmax b 10 68 ns 1121 rad RAS to Column Addr Delay Time bcp b 10 40 ns 1122 rsh RAS Hold Time bcp b 10 40 ns 1123 ral Column Addr to RAS Lead Time bcp a bch b 10 68 ns 1124 wcs Write Command Setup Time bcp a bcl b 10 68 ns 1125 wch Write Command Hold Time bcp b 10 40 ns 1126 ar Column Add Hold Time from RAS 2 bcp a bcl b10 112 ns 1127 csh CAS Hold Time 2 bcp a bcl b 10 112 ns 1128 crp CAS to RAS Precharge Time 2 bcp b 10 90 ns Note bcp means Bus Clock period being used bch and bcl refer to the positive and negative pulse widths of Bus Clock respectively bcmax means the greater of the bch or bcl depending on the Bus Clock’s duty cycle bcmin means the lesser of the bch or bcl depending on the Bus Clock’s duty cycle 76 |
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