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零件编号
产品描述 (功能)
S2R72V27 查看數據表(PDF) - Seiko Epson Corp
零件编号
产品描述 (功能)
生产厂家
S2R72V27
Supports HS (480 Mbps), FS (12 Mbps), and LS (1.5 Mbps) transfer
Seiko Epson Corp
S2R72V27 Datasheet PDF : 41 Pages
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4. Explanation of Functions
CPU
FIFO
Channel
USB Device
Read
Write
FIFO_Empty
Free
quantity >=
MaxPktSize
IN token
NAK
handshake
IN token
IN transaction
(NAK response)
FIFO_Full
Read
Transfer
received
DATA
packet
ACK
handshake
Free
quantity <
MaxPktSize
IN transaction
(Data reply)
FIFO_Empty
Empty
Data
Free
quantity >=
MaxPktSize
IN token
NAK
handshake
IN transaction
(NAK response)
Fig. 4.6 Typical data flow (with FIFO assigned for MaxPktSize and IN transfer)
CPU
FIFO
Channel
Write
Read
FIFO_Empty
Write
Data
quantity <
MaxPktSize
USB Device
FIFO_Full
FIFO_Empty
Write
FIFO_Full
Empty
Data
Data
quantity >=
MaxPktSize
Transfer
sent
Data
quantity <
MaxPktSize
Data
quantity >=
MaxPktSize
Transfer
sent
OUT
token
DATA
packet
ACK
handshake
OUT
token
DATA
packet
ACK
handshake
OUT transaction
OUT transaction
Fig. 4.7 Typical data flow (with FIFO assigned for MaxPktSize and OUT transfer)
S2R72V27 Data Sheet (Rev. 1.00)
EPSON
11
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