Cirrus Logic EP93xx User Manual
Page 464
11-24
DS785UM1
Copyright 2007 Cirrus Logic
Universal Serial Bus Host Controller
EP93xx User’s Guide
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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