
EZ-USB TRM v1.9
Chapter 5. EZ-USB CPU
Page 5-21
The only differences between alternate settings 1 and 2 are the maximum packet sizes for
EP8IN and EP8OUT. This is a
high-bandwidth
setting using 256 bytes each.
Table 5-19. USB Default Interface 0, Alternate Setting 2, Isochronous Endpoint Descriptors
Offset
0
1
2
3
4
5
6
0
1
2
3
4
5
6
0
1
2
3
4
5
6
0
1
2
3
4
5
6
0
1
2
3
4
5
6
0
1
2
3
4
5
6
Field
Description
Value
07H
05H
88H
01H
10H
01H
01H
07H
05H
08H
01H
00H
10H
01H
07H
05H
89H
01H
10H
00H
01H
07H
05H
09H
01H
10H
00H
01H
07H
05H
8AH
01H
10H
00H
01H
07H
05H
0AH
01H
10H
00H
01H
bLength
bDescriptorType
bEndpointAddress
bmAttributes
wMaxPacketSize(L)
wMaxPacketSize(H) MaximumPacketSize-High
bInterval
PollingIntervalinMilliseconds(1foriso)
bLength
LengthofthisEndpointDescriptor
bDescriptorType
DescriptorType=
Endpoint
bEndpointAddress
EndpointDirection(1isin) andAddress=
OUT8
bmAttributes
XFR Type=
ISO
wMaxPacketSize(L)
MaximumPacketSize=
256Bytes
wMaxPacketSize(H) MaximumPacketSize-High
bInterval
PollingIntervalinMilliseconds(1foriso)
bLength
LengthofthisEndpointDescriptor
bDescriptorType
DescriptorType=
Endpoint
bEndpointAddress
EndpointDirection(1isin) andAddress=
IN9
bmAttributes
XFR Type=
ISO
wMaxPacketSize(L)
MaximumPacketSize=
16Bytes
wMaxPacketSize(H) MaximumPacketSize-High
bInterval
PollingIntervalinMilliseconds(1foriso)
bLength
LengthofthisEndpointDescriptor
bDescriptorType
DescriptorType=
Endpoint
bEndpointAddress
EndpointDirection(1isin) andAddress=
OUT9
bmAttributes
XFR Type=
ISO
wMaxPacketSize(L)
MaximumPacketSize=
16Bytes
wMaxPacketSize(H) MaximumPacketSize-High
bInterval
PollingIntervalinMilliseconds(1foriso)
bLength
LengthofthisEndpointDescriptor
bDescriptorType
DescriptorType=
Endpoint
bEndpointAddress
EndpointDirection(1isin) andAddress=
IN10
bmAttributes
XFR Type=
ISO
wMaxPacketSize(L)
MaximumPacketSize=
16Bytes
wMaxPacketSize(H) MaximumPacketSize-High
bInterval
PollingIntervalinMilliseconds(1foriso)
bLength
LengthofthisEndpointDescriptor
bDescriptorType
DescriptorType=
Endpoint
bEndpointAddress
EndpointDirection(1isin) andAddress=
OUT10
bmAttributes
XFR Type=
ISO
wMaxPacketSize(L)
MaximumPacketSize=
16Bytes
wMaxPacketSize(H) MaximumPacketSize-High
bInterval
PollingIntervalinMilliseconds(1foriso)
LengthofthisEndpointDescriptor
DescriptorType=
Endpoint
EndpointDirection(1isin) andAddress=
IN8
XFR Type=
ISO
MaximumPacketSize=
256Bytes