データシートサーチシステム |
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MC68340 データシート(PDF) 85 Page - Freescale Semiconductor, Inc |
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MC68340 データシート(HTML) 85 Page - Freescale Semiconductor, Inc |
85 / 441 page 3- 36 MC68340 USER’S MANUAL MOTOROLA S0 S2 S4 S0 S2 S4 INTERNAL PROCESSING STACK WRITE WRITE CYCLE CLKOUT DSACKx R/W AS DS BERR FC3–FC0 D15–D0 A31–A0 Figure 3-18. Late Bus Error with DSACK ≈ 3.5.2 Retry Operation When both BERR and HALT are asserted by an external device during a bus cycle, the MC68340 enters the retry sequence shown in Figure 3-19. A delayed retry, which is similar to the delayed BERR signal described previously, can also occur (see Figure 3-20). The MC68340 terminates the bus cycle, places the control signals in their inactive state, and does not begin another bus cycle until the BERR and HALT signals are negated by external logic. After a synchronization delay, the MC68340 retries the previous cycle using the same access information (address, function code, size, etc.). BERR should be negated before S2 of the retried cycle to ensure correct operation of the retried cycle. Freescale Semiconductor, Inc. For More Information On This Product, Go to: www.freescale.com |
同様の部品番号 - MC68340 |
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同様の説明 - MC68340 |
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