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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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USB333X датащи(PDF) 46 Page - Microchip Technology |
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USB333X датащи(HTML) 46 Page - Microchip Technology |
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46 / 85 page  USB333x DS00001880A-page 46 2009 - 2015 Microchip Technology Inc. Transfer of the RXCMD byte occurs in Synchronous Mode when the PHY has control of the bus. The ULPI Protocol Block shown in Figure 6-1 determines when to send an RXCMD. A RXCMD will occur: • When a linestate change occurs. • When VBUS or ID comparators change state. • During a USB receive when NXT is low. • After the USB333x deasserts DIR and STP is low during start-up. • After the USB333x exits Low Power Mode, Serial Modes, or Carkit Mode after detecting that the Link has de- asserted STP, and DIR is low. When a USB Receive is occurring, RXCMD’s are sent whenever NXT = 0 and DIR = 1. During a USB Transmit, the RXCMD’s are returned to the Link after STP is asserted. If an RXCMD event occurs during a High Speed USB transmit, the RXCMD is blocked until STP de-asserts at the end of the transmit. The RXCMD contains the status that is current at the time the RXCMD is sent. FIGURE 6-7: ULPI RXCMD TIMING TABLE 6-3: ULPI RX CMD ENCODING Data[7:0] Name Description and Value [1:0] Linestate UTMI Linestate Signals. See Section 6.3.1.1 [3:2] Encoded VBUS State ENCODED VBUS VOLTAGE STATES VALUE VBUS VOLTAGE SESSEND SESSVLD VBUSVLD2 00 VVBUS < VSESS_END 10 0 01 VSESS_END < VVBUS < VSESS_VLD 00 0 10 VSESS_VLD < VVBUS < VVBUS_VLD X1 0 11 VVBUS_VLD < VVBUS XX 1 DIR CLK DATA[7:0] STP NXT RXCMD Idle Idle T0 T1 T2 T3 T5 T4 T6 Turn around Turn around RXCMD Idle Turn around Turn around RXCMD T7 T8 |
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