OM13013,598 NXP Semiconductors, OM13013,598 Datasheet - Page 344

• Manufacturer Part Number: OM13013,598
• Description: BOARD DEMO IAR LPC1227 JLINKLITE
• Manufacturer: NXP Semiconductors
• Series: -r

Specifications of OM13013,598

• Design Resources: LPC122x-SK Brd Schematic
• Processor To Be Evaluated: LPC1227
• Processor Series: LPC122x
• Data Bus Width: 32 bit
• Interface Type: UART, SSP, SPI, I2C
• Cpu Core: ARM Cortex-M0
• Maximum Operating Temperature: + 85 C
• Minimum Operating Temperature: - 40 C
• Operating Supply Voltage: 3 V to 3.6 V
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant
• Other names: 568-6885

NXP Semiconductors
UM10441
User manual
21.7.5.3 Control data configuration
Remark: The controller does not write to this memory location.
Table 344. dst_data_end_ptr bit assignments
For each DMA transfer, the channel_cfg memory location provides the control information
for the controller.
At the start of a DMA cycle, or 2
word from SRAM memory. After the controller performs 2
updated channel_cfg word in SRAM.
The controller does not support a dst_size value that is different from the src_size value. If
the controller detects a mismatch in these values, it uses the src_size value for source
and destination, and when it next updates the n_minus_1 field, it also sets the dst_size
field to the same value as the src_size field.
After the controller completes the N transfers, it sets the cycle_ctrl field to 000 to indicate
that the channel_cfg data is invalid. At this point, the channel configuration is overwritten
in SRAM. This prevents the controller from repeating the same DMA transfer.
Remark: The controller updates the channel control data structure in SRAM after each
arbitration.
Bit
31:0
Name
dst_data_end_ptr
All information provided in this document is subject to legal disclaimers.
Rev. 1 — 15 February 2011
Chapter 21: LPC122x General purpose micro DMA controller
Description
Pointer to the end address of the destination data
R
DMA transfer, the controller fetches the channel_cfg
R
, or N, transfers, it stores the
UM10441
© NXP B.V. 2011. All rights reserved.
344 of 442