s3c2410a Samsung Semiconductor, Inc., s3c2410a Datasheet - Page 250
s3c2410a
Manufacturer Part Number
s3c2410a
Description
16/32-bit Risc Arm Microprocessor
Manufacturer
Samsung Semiconductor, Inc.
Datasheet
1.S3C2410A.pdf
(599 pages)
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DMA
DMA CONTROL (DCON) REGISTER (Continued)
8-10
SERVMODE
HWSRCSEL
SWHW_SEL
RELOAD
DSZ
TC
DCONn
[26:24]
[21:20]
[19:0]
[27]
[23]
[22]
Bit
Select the service mode between Single service mode and Whole service
mode.
0: Single service mode is selected in which after each atomic transfer
(single or burst of length four) DMA stops and waits for another DMA
request.
1: Whole service mode is selected in which one request gets atomic
transfers to be repeated until the transfer count reaches to 0. In this mode,
additional request are not required.
Note that even in the Whole service mode, DMA releases the bus after
each atomic transfer and then tries to re-get the bus to prevent starving of
other bus masters.
Select DMA request source for each DMA.
DCON0: 000:nXDREQ0 001:UART0
DCON1: 000:nXDREQ1 001:UART1
DCON2: 000:I2SSDO
DCON3: 000:UART2
These bits control the 4-1 MUX to select the DMA request source of each
DMA. These bits have meanings only if H/W request mode is selected by
DCONn[23].
Select the DMA source between software (S/W request mode) and
hardware (H/W request mode).
0: S/W request mode is selected and DMA is triggered by setting
1: DMA source selected by bit[26:24] triggers the DMA operation.
Set the reload on/off option.
0: auto reload is performed when a current value of transfer count
1: DMA channel (DMA REQ) is turned off when a current value of
Data size to be transferred.
00 = Byte
10 = Word
Initial transfer count (or transfer beat).
Note that the actual number of bytes that are transferred is computed by
the following equation: DSZ x TSZ x TC. Where, DSZ, TSZ (1 or 4), and
TC represent data size (DCONn[21:20]), transfer size (DCONn[28]), and
initial transfer count, respectively.
This value will be loaded into CURR_SRC only if the CURR_SRC is 0 and
the DMA ACK is 1.
SW_TRIG bit of DMASKTRIG control register.
becomes 0 (i.e. all the required transfers are performed).
transfer count becomes 0. The channel on/off bit (DMASKTRIGn[1]) is
set to 0 (DREQ off) to prevent unintended further start of new DMA
operation.
001:SDI
001:I2SSDI
11 = reserved
01 = Half word
Description
010:I2SSDI 011:SPI
010:SDI
010:SDI
010:SPI
011:Timer
011:Timer
011:Timer
100:USB device EP2
100:USB device EP3
100:USB device EP1
100:USB device EP4
Initial State
00000
S3C2410A
00
00
0
0
0
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