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USB3341CPTR 데이터시트(PDF) 48 Page - Microchip Technology

부품명 USB3341CPTR
상세설명  Enhanced Single Supply Hi-Speed USB ULPI Transceiver
PDF  92 Pages
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제조업체  MICROCHIP [Microchip Technology]
홈페이지  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

USB3341CPTR 데이터시트(HTML) 48 Page - Microchip Technology

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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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