MC9328MXL datasheet(66/84 Pages) FREESCALE

66 / 84 page

MC9328MXL Advance Information, Rev. 5

Freescale Semiconductor

Specifications

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.

Figure 52. USB Device Timing Diagram for Data Transfer to USB Transceiver (TX)

Table 26. 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

1tROE_VPO; USBD_ROE active to

USBD_VPO low

83.14

83.47

83.14

83.47

2tROE_VMO; USBD_ROE active to

USBD_VMO high

81.55

81.98

81.55

81.98

3tVPO_ROE; USBD_VPO high to

USBD_ROE deactivated

83.54

83.80

83.54

83.80

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

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