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DSP56004/D Datasheet(PDF) 33 Page - Freescale Semiconductor, Inc |
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DSP56004/D Datasheet(HTML) 33 Page - Freescale Semiconductor, Inc |
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33 / 82 page  Specifications External Memory Interface (EMI) DRAM Timing MOTOROLA DSP56004/D, Rev. 3 2-9 EXTERNAL MEMORY INTERFACE (EMI) DRAM TIMING (CL = 50 pF + 2 TTL Loads) Table 2-8 External Memory Interface (EMI) DRAM Timing No. Characteristics Symbol Timing Mode Expression 50 MHz 66 MHz 81 MHz Unit Min Max Min Max Min Max 41 Page Mode Cycle Time tPC slow fast 4 × T C 3 × T C 80 60 — — 61 46 — — 49.4 37.0 — — ns ns 42 RAS or RD Assertion to Data Valid tRAC, tGA slow fast 7 × T C – 16 5 × T C – 16 — — 124 84 — — 90 60 — — 70.4 45.7 ns ns 43 CAS Assertion to Data Valid tCAC slow fast 3 × T C – 10 2 × T C – 10 — — 50 30 — — 35 20 — — 27.0 14.7 ns ns 44 Column Address Valid to Data Valid tAA slow fast 3 ×T C + TL – 7 2 × T C + TL – 7 — — 63 43 — — 46 30 — — 36.2 23.8 ns ns 45 CAS Assertion to Data Active tCLZ 0 0—0— 0 — ns 46 RAS Assertion Pulse Width1 (Page Mode Access Only) tRASP slow fast 3 × T C – 11 + n × 4 × T C 2 × T C –11 + n × 3 ×T C 209 149 — — 156 110 — — 125 87.8 — — ns ns 47 RAS Assertion Pulse Width (Single Access Only) tRAS slow fast 7 × T C – 11 5 × T C – 11 129 89 — — 95 65 — — 75.4 50.8 — — ns ns 48 RAS or CAS Deassertation to RAS Assertion tRP, tCRP slow fast 5 × T C – 5 3 × T C – 5 95 55 — — 70 40 — — 56.7 32.0 — — ns ns 49 CAS Assertion Pulse Width tCAS slow fast 3 × T C – 10 2 × T C – 10 50 30 — — 35 20 — — 27.0 14.7 — — ns ns 50 Last CAS Assertion to RAS Deassertation (Page Mode Access Only) tRSH slow fast 3 × T C – 15 2 × T C – 15 45 25 — — 30 15 — — 22.0 9.7 — — ns ns 51 RAS or WR Assertion to CAS Deassertation tCSH, tCWL slow fast 7 × T C – 15 5 × T C – 15 125 85 — — 91 61 — — 71.4 46.7 — — ns ns 52 RAS Assertion to CAS Assertion tRCD slow fast 4 × T C – 13 3 × T C – 13 67 47 — — 47 32 — — 36.4 24 — — ns ns 53 RAS Assertion to Column Address Valid tRAD slow fast 3 ×T C + TH – 13 2 × T C + TH – 13 57 37 — — 40 25 — — 30.2 17.9 — — ns ns Freescale Semiconductor, Inc. For More Information On This Product, Go to: www.freescale.com |
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