EFM32G200F64 Energy Micro, EFM32G200F64 Datasheet - Page 47

• Manufacturer Part Number: EFM32G200F64
• Description: MCU 32BIT 64KB FLASH 32-QFN
• Manufacturer: Energy Micro
• Series: Geckor

Specifications of EFM32G200F64

• Core Processor: ARM® Cortex-M3™
• Core Size: 32-Bit
• Speed: 32MHz
• Connectivity: EBI/EMI, I²C, IrDA, SmartCard, SPI, UART/USART
• Peripherals: Brown-out Detect/Reset, DMA, POR, PWM, WDT
• Number Of I /o: 24
• Program Memory Size: 64KB (64K x 8)
• Program Memory Type: FLASH
• Ram Size: 16K x 8
• Voltage - Supply (vcc/vdd): 1.8 V ~ 3.8 V
• Data Converters: A/D 4x12b, D/A 1x12b
• Oscillator Type: External
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 32-VQFN Exposed Pad
• Processor Series: EFM32G200
• Core: ARM Cortex-M3
• Data Bus Width: 32 bit
• Data Ram Size: 16 KB
• Interface Type: I2C, UART
• Maximum Clock Frequency: 32 MHz
• Number Of Programmable I/os: 24
• Number Of Timers: 2
• Operating Supply Voltage: 1.8 V to 3.8 V
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• Minimum Operating Temperature: - 40 C
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -
• Lead Free Status / Rohs Status: Details

2010-09-06 - d0001_Rev1.00
Figure 8.4. Memory scatter-gather example
In Figure 8.4 (p. 47) :
Initialization
The memory scatter-gather transaction commences when the controller receives a request on
dma_req[ ] or a manual request from the host processor. The transaction continues as follows:
Primary, copy A
Task A
Primary, copy B
Task B
Primary, copy C
Initialization:
Mem ory scatter-gather transaction:
Request
Data for Task A
Data for Task B
Data for Task C
Data for Task D
1. Configure prim ary to enable the copy A, B, C, and D operations: cycle_ctrl = b100, 2
2. Write the prim ary source data to m em ory, using the structure shown in the following table.
m em ory, to Alternate
m em ory, to Alternate
m em ory, to Alternate
m em ory, to Alternate
Copy from A in
Copy from B in
Copy from C in
Copy from D in
Pr im a r y
src_data_end_ptr
0x0A000000
0x0B000000
0x0C000000
0x0D000000
Auto request
Auto request
Auto request
1. The host processor configures the primary data structure to operate in memory
2. The host processor writes the data structure for tasks A, B, C, and D to the
3. The host processor enables the channel.
1. After receiving a request, the controller performs four DMA transfers. These
2. The controller generates an auto-request for the channel and then arbitrates.
3. The controller performs task A. After it completes the task, it generates an
4. The controller performs four DMA transfers. These transfers write the alternate
5. The controller generates an auto-request for the channel and then arbitrates.
6. The controller performs task B. After it completes the task, it generates an
7. The controller performs four DMA transfers. These transfers write the alternate
scatter-gather mode by setting cycle_ctrl to b100. Because a data structure for a
single channel consists of four words then you must set 2
there are four tasks and therefore N is set to 16.
memory locations that the primary src_data_end_ptr specifies.
transfers write the alternate data structure for task A.
auto-request for the channel and then arbitrates.
data structure for task B.
auto-request for the channel and then arbitrates.
data structure for task C.
request
request
request
request
request
request
request
Auto
Auto
Auto
Auto
Auto
Auto
Auto
dst_data_end_ptr
0x0AE00000
0x0BE00000
0x0CE00000
0x0DE00000
Alt e r n a t e
Task A
Task B
Task C
Task D
channel_cfg
cycle_ctrl = b101, 2
cycle_ctrl = b101, 2
cycle_ctrl = b101, 2
cycle_ctrl = b010, 2
...the world's most energy friendly microcontrollers
N = 3, 2
N = 8, 2
N = 5, 2
N = 4, 2
47
R
R
R
R
R
R
R
R
= 4, N = 3
= 2, N = 8
= 8, N = 5
= 4, N = 4
= 4
= 2
= 8
= 4
Unused
0xXXXXXXXX
0xXXXXXXXX
0xXXXXXXXX
0xXXXXXXXX
dm a _don e [ C]
R
= 4, N = 16.
www.energymicro.com
R
to 4. In this example,