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MT90500AL Datasheet(PDF) 39 Page - Mitel Networks Corporation |
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MT90500AL Datasheet(HTML) 39 Page - Mitel Networks Corporation |
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39 / 159 page  MT90500 39 Figure 9 - Logical Byte Address vs. Physical Address and Memory Banks Note: The addressing mode, which indicates the number of address lines connected to the external memory, is selected via the ADDMODE<1:0> bits in the Memory Configuration Register (0040h). CPBANK in the same register indicates the number of memory chips per bank. Because of the bidirectional data bus, some synchronous SRAM devices may require a turnaround cycle. The MT90500 can be programmed to insert a turnaround cycle between a read access and a write access, as required (see Figure 10). Similarly, the MT90500 can be programmed to insert a turnaround cycle between a read access and a read access to the other memory bank. Some memories have an output disable time that is shorter than the output enable time (so a turnaround cycle between reads to different banks is not necessary), meanwhile other memories require a turnaround cycle. This type of turnaround cycle is illustrated in Figure 11. Byte Address 32K Addressing Mode MEM_ADD[14:0] 64K Addressing Mode MEM_ADD[15:0] 128K Addressing Mode MEM_ADD[16:0] 256K Addressing Mode MEM_ADD[17:0] 0 - 128K Bank 1 32K*4bytes Bank 1 64K*4bytes Bank 1 128K*4bytes Bank 1 256K*4bytes 128K - 256K Bank 2 32K*4bytes 256K - 384K Bank 2 64K*4bytes 384K - 512K 512K - 640K Bank 2 128K*4bytes 640K - 768K 768K - 896K 896K - 1024K 1024K - 1152K Bank 2 256K*4bytes 1152K - 1280K 1280K - 1408K 1408K - 1536K 1536K - 1664K 1664K - 1792K 1792K - 1920K 1920K - 2048K Table 9 - Memory Size Combinations Total Memory Size External Memory Address Lines Used (Double-word Address) Memory Addressing Mode Memory Chip Size Bank 1 Memory Chip Size Bank 2 64 Kbyte 13:0 32K 64 Kbyte — 128 Kbyte 14:0 32K 128 Kbyte — 192 Kbyte 14:0 32K 128 Kbyte 64 Kbyte 256 Kbyte 14:0 15:0 32K 64K 128 Kbyte 256 Kbyte 128 Kbyte — 384 Kbyte 15:0 64K 256 Kbyte 128 Kbyte 512 Kbyte 15:0 16:0 64K 128K 256 Kbyte 512 Kbyte 256 Kbyte — 768 Kbyte 16:0 128K 512 Kbyte 256 Kbyte 1024 Kbyte 16:0 17:0 128K 256K 512 Kbyte 1024 Kbyte 512 Kbyte — 1536 Kbyte 17:0 256K 1024 Kbyte 512 Kbyte 2048 Kbyte 17:0 256K 1024 Kbyte 1024 Kbyte |
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