MC9328MXL ETC, MC9328MXL Datasheet - Page 66

• Manufacturer Part Number: MC9328MXL
• Description: i.MX Integrated Portable System Processor
• Manufacturer: ETC

Specifications
66
3.16 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.
Ref No.
USBD_SUSPND
1
2
3
Table 26. 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 52. USB Device Timing Diagram for Data Transfer to USB Transceiver (TX)
(Output)
(Output)
(Output)
(Output)
(Output)
(Input)
(Input)
(Input)
t
USBD_VPO low
t
USBD_VMO high
t
USBD_ROE deactivated
ROE_VPO
ROE_VMO
VPO_ROE
; USBD_ROE active to
; USBD_VPO high to
; USBD_ROE active to
1
Parameter
t
t
ROE_VMO
ROE_VPO
MC9328MXL Advance Information, Rev. 5
2
t
PERIOD
Minimum
6
83.14
81.55
83.54
1.8V ± 0.10V
Maximum
83.47
81.98
83.80
Minimum
83.14
81.55
83.54
t
t
FEOPT
3.0V ± 0.30V
VMO_ROE
5
Freescale Semiconductor
Maximum
4
83.47
81.98
83.80
t
VPO_ROE
3
Unit
ns
ns
ns