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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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SH7041A датащи(PDF) 218 Page - Renesas Technology Corp |
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SH7041A датащи(HTML) 218 Page - Renesas Technology Corp |
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218 / 923 page  180 • Bits 11–10—DRAM Write Cycle Wait Count (DWW1–DWW0): Specifies the number of DRAM write cycle column address output cycles. Bit 11 (DWW1) Bit 10 (DWW0) Description 0 0 2-cycle (no wait) external wait disabled (initial value) 1 3-cycle (1 wait) external wait disabled 1 0 4-cycle (2 wait) external wait enabled 1 5-cycle (3 wait) external wait enabled • Bits 9–8—DRAM Read Cycle Wait Count (DWR1–DWR0): Specifies the number of DRAM read cycle column address output cycles. Bit 9 (DWR1) Bit 8 (DWR0) Description 0 0 2-cycle (no wait) external wait disabled (initial value) 1 3-cycle (1 wait) external wait disabled 1 0 4-cycle (2 wait) external wait enabled 1 5-cycle (3 wait) external wait enabled • Bit 7—DRAM Idle Cycle Count (DIW): Specifies whether to insert idle cycles, either when accessing a different external space (CS space) or when doing a DRAM write, after DRAM reads. Bit 7 (DIW) Description 0 No idle cycles (initial value) 1 1 idle cycle • Bit 6—Reserved: This bit always reads as 0. The write value should always be 0. • Bit 5—Burst Enable (BE): Specifies the DRAM operation mode. Bit 5 (BE) Description 0 Burst disabled (initial value) 1 DRAM high-speed page mode enabled . • Bit 4—RAS Down Mode (RASD): Specifies the DRAM operation mode. Bit 4 (RASD) Description 0 Access DRAM by RAS up mode (initial value) 1 Access DRAM by RAS down mode |
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