8.9.2.5
DRWSTATUS - Status control register
The current Drawing Engine status can be polled by reading this register.
Access
This register can be read in 32-bit units.
Address
<DrwE_Base> + 00
H
Index
no index because of read only access
Initial Value
0000 0000
H
. This register is initialized by any reset.
31
30
29
28
27
26
25
24
0
0
0
0
0
0
0
0
R
R
R
R
R
R
R
R
23
22
21
20
19
18
17
16
0
0
0
0
0
0
0
0
R
R
R
R
R
R
R
R
15
14
13
12
11
10
9
8
0
0
0
0
0
0
0
0
R
R
R
R
R
R
R
R
7
6
5
4
3
2
1
0
0
BUSIRQ
DLISTIR
Q
ENUMIR
Q
DLIST
ACTIVE
CACHED
IRTY
BUSYWR
ITE
BUSYEN
UM
R
R
R
R
R
R
R
R
Bit
Bit name
Function
6
BUSIRQ
0 no bus error occurred or interrupt disabled
1 bus error interrupt triggered
5
DLISTIRQ
0 display list not finished or interrupt disabled
1 display list finished interrupt triggered
4
ENUMIRQ
0 enumeration not finished or interrupt disabled
1 enumeration finished interrupt triggered
3
DLISTACTIVE
0 display list reader is idle
1 display list reader busy, no direct access to registers
2
CACHEDIRTY
0 framebuffer cache is not dirty
1 framebuffer cache is dirty, frame should not be flipped
1
BUSYWRITE
0 framebuffer writeback finished
1 framebuffer writeback busy, framebuffer type can not be changed
0
BUSYENUM
0 enumeration unit idle
1 enumeration unit busy, new primitive can not be started
Drawing Engine
Chapter 8
Preliminary User's Manual S19203EE1V3UM00
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Содержание uPD72257
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