参数资料
型号: MC9328MX1DVM20R2
厂商: MOTOROLA INC
元件分类: 微控制器/微处理器
英文描述: 200 MHz, RISC PROCESSOR, PBGA256
封装: 14 X 14 MM, 1.30 MM HEIGHT, 0.80 MM PITCH, MAPBGA-256
文件页数: 75/94页
文件大小: 1487K
代理商: MC9328MX1DVM20R2
Specifications
MOTOROLA
MC9328MX1 Advance Information
77
3.18 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
1tROE_VPO; USBD_ROE active to USBD_VPO low
83.14
83.47
ns
2tROE_VMO; USBD_ROE active to USBD_VMO high
81.55
81.98
ns
3tVPO_ROE; USBD_VPO high to USBD_ROE deactivated
83.54
83.80
ns
4tVMO_ROE; USBD_VMO low to USBD_ROE deactivated (includes
SE0)
248.90
249.13
ns
5tFEOPT; SE0 interval of EOP
160.00
175.00
ns
6tPERIOD; Data transfer rate
11.97
12.03
Mb/s
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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