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An endpoint for bulk transfers specifies the maximum data payload size that the endpoint can accept from
or transmit to the bus. The USB defines the allowable maximum bulk data payload sizes to be only 8, 16,
32, or 64 bytes for full-speed endpoints and 512 bytes for high-speed endpoints. A low-speed device must
not have bulk endpoints. This maximum applies to the data payloads of the data packets; i.e., the size
specified is for the data field of the packet as defined in Chapter 8, not including other protocol-required
information.
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