19-34
MC9328MX1 Reference Manual
MOTOROLA
LCD Controller
19.4.14 DMA Control Register
There is a 16
×
32 bit line buffer in the LCDC that stores DMA data from system memory. The DMA
Control Register controls the DMA burst length and when to trigger a DMA burst in terms of the number
of data bytes left in the pixel buffer.
NOTE:
For SDRAM access, a fixed burst length of 8 is recommended
fixed burst length = 1
high mark = 8
low mark = 4
For bus that is heavy loaded that requires SDRAM access, a dynamic burst
length is recommended
fixed burst length = 0
high mark = 4
low mark = 8
DMACR
DMA Control Register
Addr
0x00205030
BIT
31
30
29
28
27
26
25
24
23
22
21
20
19
18
17
16
BURST
HM
TYPE
rw
r
r
r
r
r
r
r
r
r
r
r
rw
rw
rw
rw
RESET
1
0
0
0
0
0
0
0
0
0
0
0
1
0
0
0
0x8008
BIT
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
TM
TYPE
r
r
r
r
r
r
r
r
r
r
r
r
rw
rw
rw
rw
RESET
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
0
0x0002
Table 19-22. DMA Control Register Description
Name
Description
Settings
BURST
Bit 31
Burst Length
—Determines whether the burst length is fixed
or dynamic.
0 = Burst length is dynamic
1 = Burst length is fixed
Reserved
Bits 30–20
Reserved—These bits are reserved and should read 0.
HM
Bits 19–16
DMA High Mark
—Establishes the high mark for DMA requests. For dynamic burst length, once the
DMA request is made, data is loaded and the pixel buffer continues to be filled until the number of
empty words left in the DMA FIFO is equal to the high mark minus 2. For fixed burst length, the
burst length (in words) of each request is equal to the DMA high mark setting.
Reserved
Bits 15–4
Reserved—These bits are reserved and should read 0.
TM
Bits 3–0
DMA Trigger Mark
—Sets the low level mark in the pixel buffer to trigger a DMA request. The low
level mark equals the number of words left in the pixel buffer.
Summary of Contents for DragonBall MC9328MX1
Page 68: ...1 12 MC9328MX1 Reference Manual MOTOROLA Introduction ...
Page 86: ...2 18 MC9328MX1 Reference Manual MOTOROLA Signal Descriptions and Pin Assignments ...
Page 116: ...3 30 MC9328MX1 Reference Manual MOTOROLA Memory Map ...
Page 126: ...4 10 MC9328MX1 Reference Manual MOTOROLA ARM920T Processor ...
Page 160: ...8 8 MC9328MX1 Reference Manual MOTOROLA System Control ...
Page 272: ...13 32 MC9328MX1 Reference Manual MOTOROLA DMA Controller ...
Page 281: ...Programming Model MOTOROLA Watchdog Timer Module 14 9 ...
Page 282: ...14 10 MC9328MX1 Reference Manual MOTOROLA Watchdog Timer Module ...
Page 300: ...15 18 MC9328MX1 Reference Manual MOTOROLA Analog Signal Processor ASP ...
Page 438: ...18 16 MC9328MX1 Reference Manual MOTOROLA Serial Peripheral Interface Modules SPI 1 and SPI 2 ...
Page 478: ...19 40 MC9328MX1 Reference Manual MOTOROLA LCD Controller ...
Page 574: ...21 32 MC9328MX1 Reference Manual MOTOROLA Memory Stick Host Controller MSHC Module ...
Page 598: ...23 16 MC9328MX1 Reference Manual MOTOROLA Real Time Clock RTC ...
Page 670: ...24 72 MC9328MX1 Reference Manual MOTOROLA SDRAM Memory Controller ...
Page 726: ...25 56 MC9328MX1 Reference Manual MOTOROLA SmartCard Interface Module SIM ...
Page 736: ...26 10 MC9328MX1 Reference Manual MOTOROLA General Purpose Timers ...
Page 854: ...29 18 MC9328MX1 Reference Manual MOTOROLA I2C Module ...
Page 900: ...30 46 MC9328MX1 Reference Manual MOTOROLA Synchronous Serial Interface SSI ...
Page 942: ...32 26 MC9328MX1 Reference Manual MOTOROLA GPIO Module and I O Multiplexer IOMUX ...