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MSI接口形式,建议从AXI4-LITE改成AXI4接口形式 #16

@zhaohong1988

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@zhaohong1988

经分析,并客户也反馈:
由于cmn协议的master对接口,不支持AXI4-Lite协议,并且像PCIE等设备误发出burstlen超过1个的时候,IMSIC会发出多个response,导致总线挂死行为,对于集成或功能上,都不灵活,建议将访问接口改为AXI4,以便更灵活处理。

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