參數(shù)資料
型號: ATSAM3S-EK2
廠商: Atmel
文件頁數(shù): 18/57頁
文件大?。?/td> 0K
描述: EVAL KIT FOR SAM3S8 & SAM3SD8
設計資源: SAM3S-EK2 Design & Mfg Files
SAM3S-EK2 Design & Mfg Files Information
SAM3S-EK2 Demo Release Notes
標準包裝: 1
類型: MCU
適用于相關產(chǎn)品: ATSAM3S 系列
所含物品:
25
11090BS–ATARM–22-Oct-13
SAM3S8/SD8 Summary
7.5
Master to Slave Access
All the Masters can normally access all the Slaves. However, some paths do not make sense,
for example allowing access from the Cortex-M3 S Bus to the Internal ROM. Thus, these paths
are forbidden or simply not wired, and shown as “-” in the following table.
7.6
Peripheral DMA Controller
Handles data transfer between peripherals and memories
Low bus arbitration overhead
– One Master Clock cycle needed for a transfer from memory to peripheral
– Two Master Clock cycles needed for a transfer from peripheral to memory
Next Pointer management for reducing interrupt latency requirement
The Peripheral DMA Controller handles transfer requests from the channel according to the fol-
lowing priorities (Low to High priorities):
Table 7-3.
SAM3S8_SD8 Master to Slave Access
Slaves
Masters
0
1
2
3
Cortex-M3 I/D
Bus
Cortex-M3 S
Bus
PDC
CRCCU
0
Internal SRAM
-
X
1
Internal ROM
X
-
X
2
Internal Flash
X
-
X
3
External Bus Interface
-
X
4
Peripheral Bridge
-
X
-
Table 7-4.
Peripheral DMA Controller
Instance name
Channel T/R
USART2
Transmit
USART2
Receive
PWM
Transmit
TWI1
Transmit
TWI0
Transmit
UART1
Transmit
UART0
Transmit
USART1
Transmit
USART0
Transmit
DACC
Transmit
SPI
Transmit
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