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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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USB334X датащи(PDF) 48 Page - Microchip Technology |
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USB334X датащи(HTML) 48 Page - Microchip Technology |
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48 / 92 page  USB334x DS00002646A-page 48 2009-2018 Microchip Technology Inc. 6.3 USB334x Receiver The following section describes how the USB334x uses the ULPI interface to receive USB signaling and transfer status information to the Link. This information is communicated to the Link using RX Commands to relay bus status and received USB packets. 6.3.1 ULPI RECEIVE COMMAND (RX CMD) The ULPI Link needs information which was provided by the following pins in a UTMI implementation: linestate[1:0], rxactive, rxvalid, rxerror, and VbusValid. When implementing the OTG functions, the VBUS and ID pin states must also be transferred to the Link. ULPI defines a Receive Command Byte (RXCMD) that contains this information. An RXCMD can be sent a any time the bus is idle. The RXCMD is initiated when the USB334x asserts DIR to take con- trol of the bus. The timing of RXCMD is shown in the figure below. The USB334x can send single or back to back RXCMD’s as required. The Encoding of the RXCMD byte is given in the Table 6-3. FIGURE 6-6: ULPI EXTENDED REGISTER READ IN SYNCHRONOUS MODE DIR CLK DATA[7:0] STP NXT TXD CMD extended reg read Idle T0 Reg Data Turn around Turn around T1 T2 T3 T4 T5 T6 Idle Extended address T7 |
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