參數(shù)資料
型號： MC9328MXL20
廠商： MOTOROLA INC
元件分類： 微控制器/微處理器
英文描述： 32-BIT, 200 MHz, MICROPROCESSOR, PBGA256
封裝： 14 X 14 MM, 1.30 MM HEIGHT, 0.80 MM PITCH, MAPBGA-256
文件頁數(shù)： 66/84頁
文件大小： 1492K
代理商： MC9328MXL20
Specifications
MOTOROLA
MC9328MXL Advance Information
69
3.15 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 57. USB Device Timing Diagram for Data Transfer to USB Transceiver (TX)
Table 24. USB Device Timing Parameter Table for Data Transfer to USB Transceiver (TX)
Ref No.
Parameter
1.8V ± 0.10V
3.0V ± 0.30V
Unit
Minimum
Maximum
Minimum
Maximum
1
tROE_VPO; USBD_ROE active to
USBD_VPO low
83.14
83.47
83.14
83.47
ns
2
tROE_VMO; USBD_ROE active to
USBD_VMO high
81.55
81.98
81.55
81.98
ns
3
tVPO_ROE; USBD_VPO high to
USBD_ROE deactivated
83.54
83.80
83.54
83.80
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
tVPO_ROE
tFEOPT
tROE_VMO
tPERIOD
1
2
3
4
5
6
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