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전자부품 데이터시트 검색엔진 |
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전자부품 데이터시트 검색엔진 |
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AT91SAM7A2-AI 데이터시트(PDF) 28 Page - ATMEL Corporation |
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AT91SAM7A2-AI 데이터시트(HTML) 28 Page - ATMEL Corporation |
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28 / 369 page  28 PRELIMINARY AT91SAM7A2 6021A–ATARM–07/04 Figure 10. EBI Connection for 2x8-bit External Memory Devices, 16-bit Access Only 8-bit or 16-bit Access Device Connection A typical 16-bit memory (e.g. 16-bit SRAM) device connection with 8- or 16-bit access is shown below. This 16-bit memory allows upper/lower bank selection and NUB, NLB are used to achieve an 8-bit access. • The A0/NLB signal is used as NLB and enables the lower byte for both read and write operations. • The NWR1/NUB signal is used as NUB and enables the upper byte for both read and write operations. • The NWR0/NWE signal is used as NWE and enables half-word or byte writes. • The NRD/NOE signal is used as NOE and enables half-word and byte reads. Figure 11. EBI Connection for External 16-bit Memory Devices, 8- or 16-bit Access EBI A[21:1] NOE NWE D[15:0] NCS D[7:0] A[20:0] NWE NOE NCE D[15:0] D[7:0] D[15:8] D[7:0] A[20:0] NWE NOE NCE 8-bit External Memory (LSB) 8-bit External Memory (MSB) EBI A[21:1] NOE NWE D[15:0] NCS D[15:0] A[20:0] NWE NOE NCE NUB NUB NLB NLB 16-bit External Memory |
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