LPC1767FBD100,551 NXP Semiconductors, LPC1767FBD100,551 Datasheet - Page 258

• Manufacturer Part Number: LPC1767FBD100,551
• Description: IC ARM CORTEX MCU 512K 100-LQFP
• Manufacturer: NXP Semiconductors
• Series: LPC17xxr

Specifications of LPC1767FBD100,551

• Core Processor: ARM® Cortex-M3™
• Core Size: 32-Bit
• Speed: 100MHz
• Connectivity: Ethernet, I²C, IrDA, Microwire, SPI, SSI, UART/USART
• Peripherals: Brown-out Detect/Reset, DMA, I²S, Motor Control PWM, POR, PWM, WDT
• Number Of I /o: 70
• Program Memory Size: 512KB (512K x 8)
• Program Memory Type: FLASH
• Ram Size: 64K x 8
• Voltage - Supply (vcc/vdd): 2.4 V ~ 3.6 V
• Data Converters: A/D 8x12b, D/A 1x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 100-LQFP
• Processor Series: LPC17
• Core: ARM Cortex M3
• 3rd Party Development Tools: MDK-ARM, RL-ARM, ULINK2, MCB1760, MCB1760U, MCB1760UME
• For Use With: 622-1005 - USB IN-CIRCUIT PROG ARM7 LPC2K
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -
• Lead Free Status / Rohs Status: Details
• Other names: 568-4967; 935289808551

NXP Semiconductors
UM10360
User manual
11.15.4.2 DMA_mode
11.15.4.3 Next_DD_valid
11.15.4.4 Isochronous_endpoint
11.15.4.5 Max_packet_size
11.15.4.6 DMA_buffer_length
11.15.4.7 DMA_buffer_start_addr
11.15.4.8 DD_retired
11.15.4.9 DD_status
Specifies the DMA mode of operation. Two modes have been defined: Normal and
Automatic Transfer Length Extraction (ATLE) mode. In normal mode, software initializes
the DMA_buffer_length for OUT endpoints. In ATLE mode, the DMA_buffer_length is
extracted from the incoming data. See
(ATLE) mode operation” on page 263
This bit indicates whether the software has prepared the next DMA descriptor. If set, the
DMA engine fetches the new descriptor when it is finished with the current one.
When set, this bit indicates that the descriptor belongs to an isochronous endpoint. Hence
5 words have to be read when fetching it.
The maximum packet size of the endpoint. This parameter is used while transferring the
data for IN endpoints from the memory. It is used for OUT endpoints to detect the short
packet. This is applicable to non-isochronous endpoints only. This field should be set to
the same MPS value that is assigned for the endpoint using the USBMaxPSize register.
This indicates the depth of the DMA buffer allocated for transferring the data. The DMA
engine will stop using this descriptor when this limit is reached and will look for the next
descriptor.
In Normal mode operation, software sets this value for both IN and OUT endpoints. In
ATLE mode operation, software sets this value for IN endpoints only. For OUT endpoints,
hardware sets this value using the extracted length of the data stream.
For isochronous endpoints, DMA_buffer_length is specified in number of packets, for
non-isochronous endpoints in bytes.
The address where the data is read from or written to. This field is updated each time the
DMA engine finishes transferring a packet.
This bit is set by hardware when the DMA engine finishes the current descriptor. This
happens when the end of the buffer is reached, a short packet is transferred
(non-isochronous endpoints), or an error condition is detected.
The status of the DMA transfer is encoded in this field. The following codes are defined:
•
•
•
NotServiced - No packet has been transferred yet.
BeingServiced - At least one packet is transferred.
NormalCompletion - The DD is retired because the end of the buffer is reached and
there were no errors. The DD_retired bit is also set.
All information provided in this document is subject to legal disclaimers.
Rev. 2 — 19 August 2010
for more details.
Section 11.15.7 “Auto Length Transfer Extraction
Chapter 11: LPC17xx USB device controller
UM10360
© NXP B.V. 2010. All rights reserved.
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