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MC68340 Scheda tecnica(PDF) 271 Page - Freescale Semiconductor, Inc |
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MC68340 Scheda tecnica(HTML) 271 Page - Freescale Semiconductor, Inc |
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271 / 441 page  MOTOROLA MC68340 USER’S MANUAL 6- 21 ........ . . ....... NOTE: 1. To cause another DMA transfer, DREQx is asserted after DACKx is asserted and before DACKx is negated. 2. DACKx and DONEx (DMA control signals) are asserted in the source (read) DMA cycle. A31–A0 FC3–FC0 SIZ1–SIZ0 R/W AS DS DSACKx S0 S2 S4 S0 S4 S0 S2 S4 S0 S2 D15–D0 DREQx DACKx DONEx (OUTPUT) DMA READ CPU CYCLE CLKOUT CPU CYCLE DMA READ Figure 6-13. Fast Termination Option (Cycle Steal) If the fast termination option is used with external burst request mode (Figure 6-14), an extra DMA cycle may result on every burst transfer. Normally, DREQ ≈ is negated when DACK ≈ is returned. In the burst mode with fast termination selected, a new cycle starts even if DREQ ≈ is negated simultaneously with DACK≈ assertion. Freescale Semiconductor, Inc. For More Information On This Product, Go to: www.freescale.com |
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