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Critical USB requirements are imposed on USB host controllers in order to support isochronous data transfers. One requirement is that transactions on the bus are always framed into 1ms quanta. Therefore, this analytic model focuses on the number of "byte times per frame (BTF)", e.g. it looks at the opportunities to transmit bytes in a 1ms time period even though the bus is a bit serial bus. Table 1 shows USB’s raw bus speed, 12MHz. This translates into the time to transmit 1500 bytes during a 1ms USB frame.
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