On 09/24/2015 03:50 PM, Steinar H. Gunderson wrote:
On Thu, Sep 24, 2015 at 03:35:10PM +0200, Krzysztof Opasiak wrote:
No. The 2nd altset is 2.16, the 4th altset is 1.04. Unless my calculations
are wrong.
How do you do your calculations?
Like I said in my initial email:
The interface of each card has two relevant alternates, 2 and 4. Number 2 has
bInterval=1, bMaxBurst=11, Mult=2, which from what I can see should be
11*(2+1)*1024 byte / 125µs, or 2.16 Gbit/sec. Number 4 has bInterval=1,
bMaxBurst=8, Mult=1, which should be 8*(1+1)*1024 byte / 125 µs, or 1.04
Gbit/sec.
As far I can see in tutorials the correct equation is:
(bMaxBurst + 1)*(Mult + 1)*wMaxPacketSize
So for 2nd you should get:
12*3*1024 = 36864 /125µs what gives 2.95 GBit/sec.
and for 4th one:
9*2*1024 = 18432 /125µs what gives 1.47 GBit/sec.
But this should still fit.
Sorry... no other ideas...
--
Krzysztof Opasiak
Samsung R&D Institute Poland
Samsung Electronics
--
To unsubscribe from this list: send the line "unsubscribe linux-usb" in
the body of a message to majord...@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
