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CY7C67300-100AXA Datasheet(PDF) 7 Page - Cypress Semiconductor |
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CY7C67300-100AXA Datasheet(HTML) 7 Page - Cypress Semiconductor |
7 / 102 page CY7C67300 Document #: 38-08015 Rev. *K Page 7 of 102 External Memory Interface Pins External Memory Interface Block Diagrams Figure 2 illustrates how to connect a 64k × 8 memory array (SRAM/ROM) to the EZ-Host external memory interface. Figure 3 illustrates the interface for connecting a 16-bit ROM or 16-bit RAM to the EZ-Host external memory interface. In 16-bit mode, up to 256K words of external ROM or RAM are supported. Note that the address lines do not map directly. Table 6. External Memory Interface Pins Pin Name Pin Number nWR 64 nRD 62 nXMEMSEL (optional nCS) 34 nXROMSEL (ROM nCS) 35 nXRAMSEL (RAM nCS) 36 A18 95 A17 96 A16 97 A15 38 A14 33 A13 32 A12 31 A11 30 A10 27 A9 25 A8 24 A7 20 A6 17 A5 8 A4 7 A3 3 A2 2 A1 1 nBEL/A0 99 nBEH 98 D15 67 D14 68 D13 69 D12 70 D11 71 D10 72 D9 73 D8 74 D7 76 D6 77 D5 78 D4 79 D3 80 D2 81 D1 82 D0 83 Figure 2. Interfacing to 64k × 8 Memory Array Figure 3. Interfacing up to 256k × 16 for External Code/Data Table 6. External Memory Interface Pins (continued) Pin Name Pin Number EZ-Host CY7C67300 External Memory Array 64K x 8 A[15:0] nWR nRD nXRAMSEL A[15:0] WE OE CE D[7:0] D[7:0] Interfacing to 64K x 8 External Memory Array EZ-Host CY7C67300 External Memory Array Up to 256k x 16 A[18:1] nBEL nBEH nWR nRD nXMEMSEL A[17:0] BLE WE OE CE D[15:0] D[15:0] Up to 256k x 16 External Code/Data (Page Mode) BHE [+] Feedback |
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