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MPC8280 Datasheet(PDF) 458 Page - Freescale Semiconductor, Inc |
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MPC8280 Datasheet(HTML) 458 Page - Freescale Semiconductor, Inc |
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458 / 1386 page  Memory Controller MPC8280 PowerQUICC II Family Reference Manual, Rev. 1 11-38 Freescale Semiconductor Table 11-21 shows SDRAM address multiplexing for A16–A31. 11.4.6 SDRAM Device-Specific Parameters The software is responsible for setting correct values to some device-specific parameter that can be extracted from the data sheet. The values are stored in the ORx and P/LSDMR registers. These parameters include the following: • Precharge to activate interval (P/LSDMR[PRETOACT]). See Section 11.4.6.1, “Precharge-to-Activate Interval.” • Activate to read/write interval (P/LSDMR[ACTTORW]). See Section 11.4.6.2, “Activate to Read/Write Interval.” • CAS latency, column address to first data out (P/LSDMR[CL]). See Section 11.4.6.3, “Column Address to First Data Out—CAS Latency.” • Last data out to precharge (P/LSDMR[LDOTOPRE]). Section 11.4.6.4, “Last Data Out to Precharge.” • Write recovery, last data in to precharge (P/LSDMR[WRC]). See Section 11.4.6.5, “Last Data In to Precharge—Write Recovery.” Table 11-20. SDRAM Address Multiplexing (A0–A15) SDAM External Bus Address Pins A0 A1 A2 A3 A4 A5 A6 A7 A8 A9 A10 A11 A12 A13 A14 A15 000 Signal driven on external pins when address multiplexing is enabled —— —— —— —— — — — — — A5 A6 A7 001 — —— —— —— ——— —— —— A5 A6 010 — —— —— —— ——— —— —— — A5 011 — —— —— —— ——— —— —— —— 100 — —— —— —— ——— —— —— —— 101 — —— —— —— ——— —— —— —— Table 11-21. SDRAM Address Multiplexing (A16–A31) SDAM External Bus Address Pins A16 A17 A18 A19 A20 A21 A22 A23 A24 A25 A26 A27 A28 A29 A30 A31 000 Signal driven on external pins when address multiplexing is enabled A8 A9 A10 A11 A12 A13 A14 A15 A16 A17 A18 A19 A20 A21 A22 A23 001 A7 A8 A9 A10 A11 A12 A13 A14 A15 A16 A17 A18 A19 A20 A21 A22 010 A6 A7 A8 A9 A10 A11 A12 A13 A14 A15 A16 A17 A18 A19 A20 A21 011 A5 A6 A7 A8 A9 A10 A11 A12 A13 A14 A15 A16 A17 A18 A19 A20 100 A4 A5 A6 A7 A8 A9 A10 A11 A12 A13 A14 A15 A16 A17 A18 A19 101 — — A5 A6 A7 A8 A9 A10 A11 A12 A13 A14 A15 A16 A17 A18 |
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