MC9328MX1/D ETC, MC9328MX1/D Datasheet - Page 80
MC9328MX1/D
Manufacturer Part Number
MC9328MX1/D
Description
i.MX Integrated Portable System Processor
Manufacturer
ETC
Datasheet
1.MC9328MX1D.pdf
(96 pages)
- Current page: 80 of 96
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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.
80
Ref No.
USBD_SUSPND
1
2
3
4
5
Table 37. USB Device Timing Parameter Table for Data Transfer to USB Transceiver (TX)
USBD_VMO
USBD_ROE
USBD_VPO
USBD_RCV
USBD_AFE
USBD_VM
USBD_VP
Figure 61. USB Device Timing Diagram for Data Transfer to USB Transceiver (TX)
(Output)
(Output)
(Output)
(Output)
(Output)
t
t
t
t
t
ROE_VPO
ROE_VMO
VPO_ROE
VMO_ROE
FEOPT
(Input)
(Input)
(Input)
; SE0 interval of EOP
; USBD_ROE active to USBD_VPO low
; USBD_VPO high to USBD_ROE deactivated
; USBD_ROE active to USBD_VMO high
; USBD_VMO low to USBD_ROE deactivated (includes SE0)
1
t
t
ROE_VMO
ROE_VPO
MC9328MX1 Advance Information, Rev. 4
2
Parameter
t
PERIOD
6
Minimum
248.90
160.00
83.14
81.55
83.54
t
t
FEOPT
VMO_ROE
5
Freescale Semiconductor
Maximum
4
249.13
175.00
83.47
81.98
83.80
t
VPO_ROE
3
Unit
ns
ns
ns
ns
ns
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