S2R72V27B08 查看數據表（PDF） - Seiko Epson Corp

零件编号

产品描述 (功能)

生产厂家

S2R72V27B08

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

Seiko Epson Corp 

4. Explanation of Functions

CPU

USB FIFO

Endpoint

USB Host

Read

Write

FIFO_Empty

Free quantity >=

MaxPktSize

PING token

ACK handshake

PING transaction

(ACK response)

FIFO_Full

Read

FIFO_Empty

Transfer received

OUT token

DATA packet

NYET handshake

OUT transaction

(Data receipt)

Empty

Data

Free quantity <

MaxPktSize

Free quantity >=

MaxPktSize

PING token

NAK handshake

PING token

ACK handshake

PING transaction

(NAK response)

PING transaction

(ACK response)

Note: PING transactions are performed only in High Speed mode.

Fig. 4.5 Typical data flow (with FIFO assigned for MaxPktSize and OUT transfer)

4.6.4

USB Device Port External Circuits

The LSI USB Port 0 has internal FS and HS device termination resistors, eliminating the

need for the components normally used to adjust impedance. This allows a DP/DM line to

be connected directly between the LSI terminal and the connector. Note that the

appropriate components must be used to ensure static electricity protection and to

implement EMI precautions.

The VBUS terminal uses a 5 V input and does not require external voltage conversion. A

protection circuit is recommended, since certain commercially-available USB host and hub

products may apply surge voltages exceeding VBUS ratings.

Refer to the separately provided PCB Design Guidelines for S2R72V Series USB 2.0

Hi-Speed.

S2R72V27 Data Sheet (Rev. 1.00)

EPSON

9

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