參數(shù)資料
型號: MC9328MX21VH
廠商: Motorola, Inc.
英文描述: i.MX family of microprocessors
中文描述: i.MX系列微處理器
文件頁數(shù): 80/96頁
文件大?。?/td> 1495K
代理商: MC9328MX21VH
MC9328MX1 Advance Information, Rev. 4
80
Freescale Semiconductor
Specifications
3.19 USB Device Port
Four types of data transfer modes exist for the USB module: control transfers, bulk transfers, isochronous transfers,
and interrupt transfers. From the perspective of the USB module, the interrupt transfer type is identical to the bulk
data transfer mode, and no additional hardware is supplied to support it. This section covers the transfer modes and
how they work from the ground up.
Data moves across the USB in packets. Groups of packets are combined to form data transfers. The same packet
transfer mechanism applies to bulk, interrupt, and control transfers. Isochronous data is also moved in the form of
packets, however, because isochronous pipes are given a fixed portion of the USB bandwidth at all times, there is
no end-of-transfer.
Figure 61. USB Device Timing Diagram for Data Transfer to USB Transceiver (TX)
Table 37. USB Device Timing Parameter Table for Data Transfer to USB Transceiver (TX)
Ref No.
Parameter
Minimum
Maximum
Unit
1
t
ROE_VPO
; USBD_ROE active to USBD_VPO low
83.14
83.47
ns
2
t
ROE_VMO
; USBD_ROE active to USBD_VMO high
81.55
81.98
ns
3
t
VPO_ROE
; USBD_VPO high to USBD_ROE deactivated
83.54
83.80
ns
4
t
VMO_ROE
; USBD_VMO low to USBD_ROE deactivated (includes SE0)
248.90
249.13
ns
5
t
FEOPT
; SE0 interval of EOP
160.00
175.00
ns
USBD_AFE
(Output)
USBD_ROE
(Output)
USBD_VPO
(Output)
USBD_VMO
(Output)
USBD_SUSPND
(Output)
USBD_RCV
(Input)
USBD_VP
(Input)
USBD_VM
(Input)
t
ROE_VPO
t
VMO_ROE
t
VPO_ROE
t
FEOPT
t
ROE_VMO
t
PERIOD
1
2
3
4
5
6
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