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USB334X 数据表(PDF) 49 Page - Microchip Technology |
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USB334X 数据表(HTML) 49 Page - Microchip Technology |
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49 / 92 page  2009-2018 Microchip Technology Inc. DS00002646A-page 49 USB334x 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 USB334x deasserts DIR and STP is low during start-up • After the USB334x 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 Hi-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 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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