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MAx packet size
by Unknown on Mar 23, 2004 |
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Hi
If an endpoint max packet size is 64 bytes and host requests for an in transaction( setup packet ) of size 64 bytes, is it fine if device responds with 60 bytes and then 4 bytes.( assuming each time there will be an IN token from host). regards |
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MAx packet size
by Unknown on Mar 23, 2004 |
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No. The device should respond 64 bytes first and then a 0 byte packet.
-----原始邮件-----
å‘件人: usb-bounces@opencores.org [mailto:usb-bounces@opencores.org]代表 P.Ravi
å‘é€æ—¶é—´: 2004å¹´3月23æ—¥ 15:07
收件人: usb
主题: [usb] MAx packet size
Hi
If an endpoint max packet size is 64 bytes and host requests for an in
transaction( setup packet ) of size 64 bytes,
is it fine if device responds with 60 bytes and then 4 bytes.( assuming
each time there will be an IN token from host).
regards
_______________________________________________
http://www.opencores.org/mailman/listinfo/usb
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MAx packet size
by zhangchun on Mar 23, 2004 |
zhangchun
Posts: 4 Joined: Aug 14, 2014 Last seen: Jan 3, 2025 |
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Why a 0 byte packet should be responded ?
----- Original Message -----
From: "Zhu Xiaolin" zhuxl@vimicro.com>
To: "Discussion list about free,open source USB IP core" usb@opencores.org>
Sent: Tuesday, March 23, 2004 3:36 PM
Subject: ç”å¤: [usb] MAx packet size
No. The device should respond 64 bytes first and then a 0 byte packet.
-----原始邮件-----
å‘件人: usb-bounces@opencores.org [mailto:usb-bounces@opencores.org]代表 P.Ravi
å‘é€æ—¶é—´: 2004å¹´3月23æ—¥ 15:07
收件人: usb
主题: [usb] MAx packet size
Hi
If an endpoint max packet size is 64 bytes and host requests for an in
transaction( setup packet ) of size 64 bytes,
is it fine if device responds with 60 bytes and then 4 bytes.( assuming
each time there will be an IN token from host).
regards
_______________________________________________
http://www.opencores.org/mailman/listinfo/usb
_______________________________________________
http://www.opencores.org/mailman/listinfo/usb
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MAx packet size
by Unknown on Mar 23, 2004 |
Not available! | ||
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If you declared to the host that your max packet size is 64 , when the host recieve your sized 60 packet, it will suppose your device have finish the transcation as it recieve a packet with size smaller than max packet size. Normally it will not send you an IN TOKEN anymore so you can't hand in your last sized 4 packet.
And why you need to divided your packet into two ? Regards, TOM
From: "zhangchun" zhangchun@tsinghua.edu.cn>
Reply-To: "Discussion list about free,open source USB IP core" usb@opencores.org>
To: "Discussion list about free,open source USB IP core" usb@opencores.org>
Subject: Re: [usb] MAx packet size
Date: Tue, 23 Mar 2004 17:26:52 +0800
Why a 0 byte packet should be responded ?
----- Original Message -----
From: "Zhu Xiaolin" zhuxl@vimicro.com>
To: "Discussion list about free,open source USB IP core" usb@opencores.org>
Sent: Tuesday, March 23, 2004 3:36 PM
Subject: çÂӌ?: [usb] MAx packet size
_________________________________________________________________
¨Ã¥Î MSN Messenger¡A»PªB¤Ã¦b½u¤W²á¤Ñ: http://messenger.microsoft.com/tc
> No. The device should respond 64 bytes first and then a 0 byte packet.
>
> -----?Ÿå??®ä»¶-----
> ?‘件äº? usb-bounces@opencores.org [mailto:usb-bounces@opencores.org]ä»?¡¨ P.Ravi
> ?‘é€Â时?? 2004å¹???3??15:07
> ?¶ä»¶äº? usb
> 主é?: [usb] MAx packet size
>
>
> Hi
>
> If an endpoint max packet size is 64 bytes and host requests for an in
> transaction( setup packet ) of size 64 bytes,
> is it fine if device responds with 60 bytes and then 4 bytes.( assuming
> each time there will be an IN token from host).
>
> regards
>
>
> _______________________________________________
> http://www.opencores.org/mailman/listinfo/usb
>
> _______________________________________________
> http://www.opencores.org/mailman/listinfo/usb
>
_______________________________________________
http://www.opencores.org/mailman/listinfo/usb
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