Handshake Packet - Fujitsu MB90335 Series Hardware Manual

MB90335 Series
12.5.5

Handshake Packet

Transmission/reception partner must be informed of your own status via handshake
packet.
■ Handshake Packet
The reception side transmits one of ACK, NAK, and STALL when it determines through handshake packet
whether it can receive data properly or the endpoint supports it. Then, when the USB circuit receives a
handshake packet, the received handshake packet is set to the HS bit of the host error status register
(HERR). When the handshake packet is transmitted, the transmitted handshake packet is set to the HS bit of
the host error status register (HERR).
CM44-10137-6E FUJITSU MICROELECTRONICS LIMITED
CHAPTER 12 USB HOST
12.5 Operation of USB HOST
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