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AT91 Datasheet(PDF) 21 Page - ATMEL Corporation |
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AT91 Datasheet(HTML) 21 Page - ATMEL Corporation |
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21 / 153 page  21 AT91X40 Series 1354D–ATARM–08/02 Chip Select Lines The EBI provides up to eight chip select lines: • Chip select lines NCS0 - NCS3 are dedicated to the EBI (not multiplexed). • Chip select lines CS4 - CS7 are multiplexed with the top four address lines A23 - A20. By exchanging address lines for chip select lines, the user can optimize the EBI to suit the external memory requirements: more external devices or larger address range for each device. The selection is controlled by the ALE field in EBI_MCR (Memory Control Register). The following combinations are possible: A20, A21, A22, A23 (configuration by default) A20, A21, A22, CS4 A20, A21, CS5, CS4 A20, CS6, CS5, CS4 CS7, CS6, CS5, CS4 Figure 7. Memory Connections for Four External Devices Note: For four external devices, the maximum address space per device is 16M bytes. EBI NCS0 - NCS3 NRD NWRx A0 - A23 D0 - D15 NCS3 NCS2 NCS1 NCS0 8 or 16 Memory Enable Memory Enable Memory Enable Memory Enable Output Enable Write Enable A0 - A23 D0 - D15 or D0 - D7 |
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