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DSP56321RM/D 数据表(PDF) 39 Page - NXP Semiconductors |
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DSP56321RM/D 数据表(HTML) 39 Page - NXP Semiconductors |
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39 / 88 page ![]() 2-15 AC Electrical Characteristics The asynchronous bus arbitration is enabled by internal synchronization circuits on BG and BB inputs. These synchronization circuits add delay from the external signal until it is exposed to internal logic. As a result of this delay, a DSP56300 part may assume mastership and assert BB, for some time after BG is deasserted. This is the reason for timing 250. Once BB is asserted, there is a synchronization delay from BB assertion to the time this assertion is exposed to other DSP56300 components that are potential masters on the same bus. If BG input is asserted before that time, and BG is asserted and BB is deasserted, another DSP56300 component may assume mastership at the same time. Therefore, some non-overlap period between one BG input active to another BG input active is required. Timing 251 ensures that overlaps are avoided. Figure 2-12. Asynchronous Bus Arbitration Timing BG1 BB 251 BG2 250 250+251 Freescale Semiconductor, Inc. For More Information On This Product, Go to: www.freescale.com |
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