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4.5
Transfer rate
USB transfer rates are standardized as shown below.
Table 4.5-1. USB Transfer rates
Low Speed
Full Speed
High Speed
USB 1.0/1.1
USB 2.0
1.5 Mbps
1.5 Mbps
12 Mbps
12 Mbps
-
480 Mbps
The MB91F662 supports only Full Speed.
4.6
Transfer rate detection
The USB standard requires that USB devices allow for the automatic detection of their data
transfer rate when connected to the host by using a pull-up resistor.
- A Full Speed device pulls up the D+ signal line with a 1.5 k ? (R2) resistor.
- A Full Speed device pulls up the D- signal line with a 1.5 k ? (R2) resistor.
(Transfer rate types will be discussed later.)
After the USB device is connected, the host detects whether it is the D+ signal line or D- signal
line that is pulled up, and selects its data transfer rate accordingly.
Additionally, cable lengths are standardized to a maximum of 5 meters for Full Speed rates, and
a maximum of 3 meters for Low Speed rates.
Figure 4.6-1 Differences in connection based on transfer rates
58
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