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UPSD3422EB40U6 Datasheet(PDF) 296 Page - STMicroelectronics |
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UPSD3422EB40U6 Datasheet(HTML) 296 Page - STMicroelectronics |
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296 / 300 page  Obsolete Product(s) - Obsolete Product(s) Obsolete Product(s) - Obsolete Product(s) Important notes UPSD3422, UPSD3433, UPSD3434, UPSD3454 296/300 implemented then this extra and unexpected data packet would result in a communication breakdown. Workaround Revision A and B - In the USB ISR, when an INx (x = the endpoint number of the IN FIFO) interrupt is detected, the IN FIFOs respective busy bit should be unconditionally cleared. The UPSD3400 USB firmware implements this workaround. 34.7 IN FIFO pairing operation Description When FIFO pairing is used on IN endpoints, an erroneous resend of a data packet may occur. See the "Erroneous Resend of Data Packet" note as it also applies when IN FIFO pairing is used. Impact on application See the "Erroneous Resend of Data Packet" note as the impact is the same when IN FIFO pairing is used. Workaround Revision A and B - See the "Erroneous Resend of Data Packet" note as the workaround is the same when IN FIFO pairing is used. 34.8 OUT FIFO pairing operation Description When data packets are received from the host and FIFO pairing is used, the paired FIFOs may get out of order. Impact on application The received data packets are read out of order compared to the way they were sent from the host. If the workaround is not implemented, the out of order packets would result in a communication breakdown. Workaround Revision A and B - In the USB ISR, when an OUTx (x = the endpoint number of the OUT FIFO) interrupt is detected, the OUT FIFOs respective busy bit should be unconditionally cleared. The UPSD3400 USB firmware implements this workaround. 34.9 Missing ACK to host retransmission of SETUP packet Description If a host does not properly receive the ACK (due to noise) from the UPSD3400 in response to a SETUP packet, it will resend the SETUP packet but the UPSD3400 will not respond Obsolete Product(s) - Obsolete Product(s) |
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