Altera cyclone V Technical Reference page 2269

cv_5v4
2016.10.28
Module Instance
usb0
usb1
Offset:
0x554
Access:
RW
31 30
15 14
hcdma2 Fields
Bit
31:0
hcdma2
USB 2.0 OTG Controller
Send Feedback
0xFFB00000
0xFFB40000
29 28 27 26
13 12 11 10
Name
Non-Isochronous: This field holds the start address of
the 512 bytes page. The first descriptor in the list
should be located in this address. The first descriptor
may be or may not be ready. The core starts
processing the list from the CTD value. This field
holds the address of the 2*(nTD+1) bytes of locations
in which the isochronous descriptors are present
where N is based on nTD as per Table below [31:N]
Base Address [N-1:3] Offset [2:0] 000 HS ISOC FS
ISOC nTD N nTD N 7 6 1 4 15 7 3 5 31 8 7 6 63 9 15 7
127 10 31 8 255 11 63 9 [N-1:3] (Isoc):[8:3] (Non
Isoc): Current Transfer Desc(CTD): Non Isochro‐
nous: This value is in terms of number of descriptors.
The values can be from 0 to 63. 0 - 1 descriptor. 63 -
64 descriptors. This field indicates the current
descriptor processed in the list. This field is updated
both by application and the core. for example, if the
application enables the channel after programming
CTD=5, then the core will start processing the 6th
descriptor. The address is obtained by adding a value
of (8bytes*5=) 40(decimal) to DMAAddr. Isochro‐
nous: CTD for isochronous is based on the current
frame/microframe value. Need to be set to zero by
application.
Base Address
Bit Fields
25 24 23 22
hcdma2
RW 0x0
9 8 7 6
hcdma2
RW 0x0
Description
hcdma2
Register Address
0xFFB00554
0xFFB40554
21 20 19 18
5 4 3 2
Access
18-179
17 16
1 0
Reset
RW 0x0
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