at91sam9g20-cu ATMEL Corporation, at91sam9g20-cu Datasheet - Page 15

• Manufacturer Part Number: at91sam9g20-cu
• Description: At91 Arm Thumb Microcontrollers
• Manufacturer: ATMEL Corporation

7.2.2
7.2.3
7.3
6384B–ATARM–15-Dec-08
Peripheral DMA Controller
Matrix Slaves
Masters to Slaves Access
Each Slave has its own arbiter, thus allowing to program a different arbitration per Slave.
Table 7-2.
All the Masters can normally access all the Slaves. However, some paths do not make sense,
like as example allowing access from the Ethernet MAC to the Internal Peripherals. Thus, these
paths are forbidden or simply not wired, and shown “-” in
Table 7-3.
Slave 0
Slave 1
Slave 2
Slave 3
Slave 4
• Acting as one Matrix Master
• Allows data transfers from/to peripheral to/from any memory space without any intervention
• Next Pointer Support, forbids strong real-time constraints on buffer management.
• Twenty-four channels
2
3
4
0
1
of the processor.
– Two for each USART
– Two for the Debug Unit
– Two for the Serial Synchronous Controller
– Two for each Serial Peripheral Interface
– One for Multimedia Card Interface
– One for Analog-to-Digital Converter
– Two for the Two-wire Interface
External Bus Interface
UHP User Interface
Internal Peripherals
Internal SRAM
Internal SRAM
Internal ROM
Master
Slave
16 Kbytes
16 Kbytes
List of Bus Matrix Slaves
AT91SAM9G20 Masters to Slaves Access
Instruction &
Internal SRAM0 16 KBytes
Internal SRAM1 16 KBytes
Internal ROM
USB Host User Interface
External Bus Interface
Internal Peripherals
ARM926
0 & 1
Data
X
X
X
X
X
X
AT91SAM9G20 Preliminary
Peripheral
Controller
DMA
X
X
X
X
X
2
X
Table
Controller
ISI
X
X
X
3
-
-
-
7-3.
Ethernet
MAC
X
X
X
4
-
-
-
USB Host
Controller
X
X
X
5
-
-
-
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