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MC68340 データシート(PDF) 86 Page - Freescale Semiconductor, Inc |
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MC68340 データシート(HTML) 86 Page - Freescale Semiconductor, Inc |
86 / 441 page MOTOROLA MC68340 USER’S MANUAL 3- 37 S0 S2 S0 S2 SW S4 SW S4 READ RERUN HALT READ CYCLE WITH RETRY DATA IGNORED CLKOUT DSACKx R/W AS DS BERR A31–A0 FC3–FC0 D15–D0 HALT Figure 3-19. Retry Sequence The MC68340 retries any read or write cycle of a read-modify-write operation separately; RMC remains asserted during the entire retry sequence. Asserting BR along with BERR and HALT provides a relinquish and retry operation. The MC68340 does not relinquish the bus during a read-modify-write operation. Any device that requires the MC68340 to give up the bus and retry a bus cycle during a read-modify-write cycle must assert only BERR and BR (HALT must not be included). The bus error handler software should examine the read-modify-write bit in the special status word (see Section 5 CPU32) and take the appropriate action to resolve this type of fault when it occurs. 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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