Datasheet > AN2720S

AN2720S

更新时间： 2022-11-29 07:24:15

品牌	Logo	应用领域
赛普拉斯 - CYPRESS		/
页数	文件大小	规格书
16页	244K
描述
Single-Chip USB-to-USB Networking Solution

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数据手册

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AN2720S 数据手册

EZ-Link (AN2720SC)

AN2720 ENDPOINTS

Figure below illustrates the AN2720 endpoints and how they are connected between two

computers A and B.

Control

(A)

(B)

EP0

endpoints

Status

(A)

(B)

EP1

Interrupt

(A)

(B)

EP2

OUT

15 packet buffer

(15 X 64 bytes)

(A)

EP2

(B)

EP2

OUT

15 packet buffer

(15 X 64 bytes)

(A)

(B)

EP3

OUT

1 packet buffer

(64 bytes)

(A)

EP3

(B)

EP3

OUT

1 packet buffer

(64 bytes)

AN2720 endpoints and FIFOS

Endpoint zero is the default CONTROL endpoints required by every USB device.

Endpoint 1 is an INTERRUPT endpoint, useful for communicating with the PC driver.

Endpoints 2 and 3 are used to transfer USB BULK data. Endpoint 2 has extensive buffering (15

packets of 64 bytes each) and is designed to transfer high-bandwidth data. Endpoint 3, with a

single packet of buffering, can be used as a higher priority channel for driver communication.

Endpoints 2 and 3 operate similarly to each other, differing only by the amount of buffering

between the computers. Considering endpoint 2, when Computer (A) sends a packet over its

endpoint 2 OUT, the packet is stored in the 15-packet FIFO. If Computer (B) does not send any

IN tokens to its endpoint 2 (to retrieve a packet) by the time fifteen packets have been stored, the

AN2720 NAKS the next OUT packet from Computer (A). This handshake is maintained by both

endpoints 2 and 3, in both directions. When one side is unplugged, all packets are flushed from

the FIFOS, and the AN2720 NAKS all IN and OUT tokens from the attached side.

AN2720 Data Sheet Version 1.0

06/07/00

Page 5

1 2 3 456 7 8...16

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