S2R72V27B08 Просмотр технического описания (PDF) - Seiko Epson Corp

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Компоненты Описание

производитель

S2R72V27B08

Supports HS (480 Mbps), FS (12 Mbps), and LS (1.5 Mbps) transfer

Seiko Epson Corp 

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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