Siemens ERTEC200 Manuel D’Utilisation
8.1 DMA Register Address Assignment
The DMA registers are 32 bits in width. The registers can be written to with 32-bit accesses only. Only the ARM946E-S
processor can access the registers.
processor can access the registers.
DMA-Register
(Start 0x8000_0000)
Register Name
Offset
Address
Address
Area
Access
Default
Description
DMAC0_SRC_ADDR_REG
0x0000
4 bytes
R/W
0x00000000
DMA Start address register
DMAC0_DEST_ADDR_REG
0x0004
4 bytes
R/W
0x00000000
DMA target address register
DMAC0_CONTR_REG
0x0008
4 bytes
R/W
0x00000000
DMA control register
DMAC0_CONF_REG
0x000C
4 bytes
R/W
0x00000000
DMA configuration register
Table 32: Overview of DMA Registers
8.2
Description of DMA Registers
(DMAC0SrcAddrReg)
DMA-Source Address
DMA-Source Address
W/R Addr.: 0x8000_0000 Default: 0x0000_0000
Description
Start address of the data block to be transferred by the DMA controller
Bit No.
Name
Description
31..0 START_ADDRESS
Start
address
Only word addresses are permitted; bits 0 and 1 are ignored
(DMAC0DestAddrReg)
DMA-Destination Address
DMA-Destination Address
W/R Addr.: 0x8000_0004 Default: 0x0000_0000
Description
Target address oft he data block to be transferred by the DMA controller
Bit No.
Name Description
31..0 DESTINATION_ADD
RESS
Target address
Only word addresses are permitted; bits 0 and 1 are ignored
Only word addresses are permitted; bits 0 and 1 are ignored
(DMAC0ContrReg)
Channel Control (*)
Channel Control (*)
W/R Addr.: 0x8000_0008 Default: 0x0000_0000
Description
To define the data block length.
31..24 Reserved
23..21 D_DELAY_EXTENTI
ON
Extends the D_Delay in number of 50 MHz clocks (see Channel Config)
20..16 S_DELAY_EXTENTI
ON
Extends the S_Delay in number of 50 MHz clocks (see Channel Config)
15..0 BYTE_COUNT
Number of bytes to be transferred. The byte count must be aligned with the
set bus width; that is, if a 32-bit byte count is set for the target or source, only
one 4-byte aligned byte count can be used.
set bus width; that is, if a 32-bit byte count is set for the target or source, only
one 4-byte aligned byte count can be used.
Copyright © Siemens AG 2007. All rights reserved.
86
ERTEC 200 Manual
Technical data subject to change Version 1.1.0