最大的从属FIFO大小可以配置到端点吗？

CYU3PDMABUFFER的尺寸变量为16位。这将是缓冲区大小的限制。
一旦接收到USB分组（整个分组），它将被发送。
你看过CYU3PDMACHANNSORT了吗？？
当做，
阿南德



     以下为原文
  The size variable of CyU3PDmaBuffer_t is 16-bit. This would be the restriction of buffer size.
    Once a USB packet (entire packet) is received it will be transmitted.
    Have you looked at CyU3PDmaChannelAbort??
    Regards,
    Anand

在通过断言PKACK硬件信号来终止短分组的情况下，也触发从从属FIFO转移到端点的数据（手动模式）的事件吗？



     以下为原文
  Is the event for transferring data (manual mode) from slave fifo to IN endpoint also triggered in the case of terminating a short packet by asserting PKTEND hardware signal?

阿南德，谢谢你的回复。
如果从FIFO的FIFO大小受到CYU3PDMABUFFER的限制，则意味着从FIFO物理尺寸可以配置为64千字节。如果从FIFO是空的。外部处理器可以在没有中断的情况下传输64字节的块数据，是真的吗？
谢谢！
测向员



     以下为原文
  Anand, Thanks for your reply.
     if the slave fifo size is limit by CyU3PDmaBuffer_t, it means the slave fifo physical size can be configured to 64KBytes. if the slave fifo is empty. the external processor can transfer a block data of 64KBytes without any interrupt, is it true?
    thanks!
    diagman

如果在GPIF和AN类型端点之间有一个自动的DMAGRANT设置，如果GPIFETCH的结尾与端点上的包长度完全相同，那么我能产生ZLP（零长度包）吗？
例如，我有GPIFIAN作为消费者。在PKKAND信号被断言之前，它得到1500字节的传输。假设端点有1024个数据包大小。我希望主机获得一个1024字节的数据包，接着是476字节的数据包。这是正确的吗？
现在如果在pkTrand信号被断言之前在gpIFI上得到1024的转移会发生什么。在1024字节的帧进入主机后，是否可以发送一个ZLPPAD？旧的FX2有一个插入ZLPS的机制，如果PKStand在UBPACK包的边界上声明。



     以下为原文
  If I have an automatic DMA channel set between the GPIF and an IN type endpoint, can I have ZLP (zero length packet) produced, if the end of the GPIF transfer is exactly the same size as the packet length on the endpoint?
     
    For example, I have the GPIF acting as consumer.  It gets a 1500 byte transfer before the PKTEND signal is asserted.  Assume the IN endpoint has a 1024 packet size.  I would expect the host to get a 1024 byte packet followed by a 476 byte packet.  Is this correct?
     
    Now what happens if I get 1024 transfer on the GPIF before the PKTEND signal is asserted.  Can I get a ZLP sent after the 1024 byte frame goes to the host?  The old FX2 had a mechanism for inserting ZLPs, if the PKTEND was asserted on a boundary of the USB packet size.

我已经回答了上面提到的部分问题。GPIF可以在一定条件下生成ZLP。根据apnote an65974，我们可以生成一个zlpby主张pktend，而不主张SLWR。
这意味着外部处理器需要注意的u***packet大小如果是生成ZLP。有没有一种方法可以从ARM处理器生成ZLPU？



     以下为原文
  I have answered part of the ZLP question I posted above.  The GPIF can generate a ZLP under certain condition.  According to the apnote AN65974, we can generate a ZLP by asserting PKTEND, while not asserting SLWR.
     
    This means the external processor needs to be aware of the USB packet size if it is to generate a ZLP.  Is there a way we can generate a ZLP from the ARM processor?

如果您推迟PKTHOSTROBLE，您不必查看包大小。我们正在使用这个机制在FPGA到FX2连接。在数据包的最后一个字之后的4个IFCKLATE，我们产生PKKANT频闪，并且不在这个时间传送更多的数据。在传输了512字节的倍数的情况下，生成ZLP。如果大小小于全分组，则在没有ZLP的情况下进行分组。如果ZLP被允许在FX2固件中，这很好。我认为它将同样适用于FX3。



     以下为原文
  If you delay the PKTEND strobe you do not have to look at the packet size. We are using this mechanism at the FPGA to FX2 connection. 4 IFCLK cycles after the last word of the packet we generate the PKTEND strobe and do not transfer further data in this time. In the case there were a multiple of 512 bytes transferred a ZLP is generated. If the size was smaller then a full packet, the packet is commited without ZLP. This works great if the ZLP are allowed in the FX2 firmware. I think it will work on the FX3 in the same manner.