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DSP56321RM/D 数据表(PDF) 36 Page - NXP Semiconductors |
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DSP56321RM/D 数据表(HTML) 36 Page - NXP Semiconductors |
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36 / 88 page  2-12 AC Electrical Characteristics 2.5.5 External Memory Expansion Port (Port A) 2.5.5.1 SRAM Timing Table 2-8. SRAM Timing No. Characteristics Symbol Expression1 220 MHz 240 MHz Unit Min Max Min Max 100 Address valid and AA assertion pulse width2 tRC, tWC (WS + 2) × T C − 4.0 [3 ≤ WS ≤ 7] (WS + 3) × T C − 4.0 [WS ≥ 8] 18.8 46.0 — 16.9 41.9 — ns ns 101 Address and AA valid to WR assertion tAS 0.75 × T C – 3.0 [WS = 3] 1.25 × T C – 3.0 [WS ≥ 4] 0.41 2.69 — — 0.13 2.21 — — ns ns 102 WR assertion pulse width tWP WS × T C − 4.0 [WS = 3] (WS − 0.5) × T C − 4.0 [WS ≥ 4] 9.65 11.93 — — 8.51 10.6 — — ns ns 103 WR deassertion to address not valid tWR 1.25 × T C − 4.0 [3 ≤ WS ≤ 7] 2.25 × T C − 4.0 [WS ≥ 8] 1.69 6.24 — — 1.21 6.51 — — ns ns 104 Address and AA valid to input data valid tAA, tAC (WS + 0.75) × T C − 5.6 [WS ≥ 3] — 11.46 — 10.04 ns 105 RD assertion to input data valid tOE (WS + 0.25) × T C − 6.5 [WS ≥ 3] — 8.29 — 7.05 ns 106 RD deassertion to data not valid (data hold time) tOHZ 0.0 — 0.0 — ns 107 Address valid to WR deassertion2 tAW (WS + 0.75) × T C − 4.0 [WS ≥ 3] 13.06 — 11.64 — ns 108 Data valid to WR deassertion (data setup time) tDS (tDW)(WS − 0.25) × TC − 5.4 [WS ≥ 3] 7.11 — 6.07 — ns 109 Data hold time from WR deassertion tDH 1.25 × T C − 4.0 [3 ≤ WS ≤ 7] 2.25 × T C − 4.0 [WS ≥ 8] 1.69 6.23 — — 1.21 5.38 — — ns ns 110 WR assertion to data active — 0.25 × T C − 4.0 [WS = 3] –0.25 × T C − 4.0 [WS ≥ 4] –2.86 –5.14 — — –2.96 –5.04 — — ns ns 111 WR deassertion to data high impedance — 1.25 × T C [3 ≤ WS ≤ 7] 2.25 × T C [WS ≥ 8] 5.69 10.24 — — 5.21 9.38 — — ns ns 112 Previous RD deassertion to data active (write) — 2.25 × T C − 4.0 [3 ≤ WS ≤ 7] 3.25 × T C − 4.0 [WS ≥ 8] 6.23 10.78 — — 5.38 9.54 — — ns ns 113 RD deassertion time — 1.75 × T C − 3.0 [3 ≤ WS ≤ 7] 2.75 × T C − 3.0 [WS ≥ 8] 4.96 9.51 — — 4.30 8.47 — — ns ns Freescale Semiconductor, Inc. For More Information On This Product, Go to: www.freescale.com |
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