Cirrus Logic EP93xx - Manual (Page 464)

11-24 DS785UM1
Copyright 2007 Cirrus Logic
Universal Serial Bus Host Controller
EP93xx User’s Guide
1
1
1
1
11
HcDoneHead
Address:
0x8002_0030
Default:
0x0000_0000
Definition:
Physical address of the last completed transfer descriptor that was added to
the done list.
Bit Description:
RSVD: Reserved. Unknown During Read.
AD: DoneHead. When a TD is completed, HC writes the
content of HcDoneHead to the NextTD field of the TD. HC
then overwrites the content of HcDoneHead with the
address of this TD. This is set to zero whenever HC writes
the content of this register to HCCA. It also sets the
WritebackDoneHead of HcInterruptStatus.
HcFmInterval
Address:
0x8002_0034
Default:
0x0000_2EDF
Definition:
Describes the bit time interval in a frame and the full speed maximum packet
size.
Bit Descriptions:
31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16
AD
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
AD RSVD
31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16
FIT FSMPS
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
RSVD FI