LPC2468FET208,551 NXP Semiconductors, LPC2468FET208,551 Datasheet - Page 381

• Manufacturer Part Number: LPC2468FET208,551
• Description: IC ARM7 MCU FLASH 512K 208TFBGA
• Manufacturer: NXP Semiconductors
• Series: LPC2400r

Specifications of LPC2468FET208,551

• Program Memory Type: FLASH
• Program Memory Size: 512KB (512K x 8)
• Package / Case: 208-TFBGA
• Core Processor: ARM7
• Core Size: 16/32-Bit
• Speed: 72MHz
• Connectivity: CAN, EBI/EMI, Ethernet, I²C, Microwire, MMC, SPI, SSI, SSP, UART/USART, USB OTG
• Peripherals: Brown-out Detect/Reset, DMA, I²S, POR, PWM, WDT
• Number Of I /o: 160
• Ram Size: 98K x 8
• Voltage - Supply (vcc/vdd): 3 V ~ 3.6 V
• Data Converters: A/D 8x10b; D/A 1x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Processor Series: LPC24
• Core: ARM7TDMI-S
• Data Bus Width: 16 bit, 32 bit
• Data Ram Size: 98 KB
• Interface Type: CAN/I2S/ISP/SSP/UART/USB
• Maximum Clock Frequency: 72 MHz
• Number Of Programmable I/os: 160
• Number Of Timers: 6
• Operating Supply Voltage: 3.3 V
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• 3rd Party Development Tools: MDK-ARM, RL-ARM, ULINK2, IRD-LPC2468-DEV, SAB-TFBGA208, KSK-LPC2468-PL
• Development Tools By Supplier: OM10100
• Minimum Operating Temperature: - 40 C
• On-chip Adc: 8-ch x 10-bit
• On-chip Dac: 1-ch x 10-bit
• Package: 208TFBGA
• Device Core: ARM7TDMI-S
• Family Name: LPC2000
• Maximum Speed: 72 MHz
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• For Use With: 622-1025 - KIT DEV IND REF DESIGN LPC2468622-1024 - BOARD SCKT ADAPTER FOR TFBGA208568-4358 - DISPLAY QVGA TFT FOR OM10100568-4309 - BOARD EXTENSION LPCSTICK568-4308 - EVAL LPC-STICK WITH LPC2468MCB2400U - BOARD EVAL MCB2400 + ULINK2MCB2400 - BOARD EVAL FOR NXP LPC246X SER622-1005 - USB IN-CIRCUIT PROG ARM7 LPC2K
• Eeprom Size: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant
• Other names: 568-4262; 935283234551; LPC2468FET208-S

NXP Semiconductors
UM10237_4
User manual
14.5.6 No_Packet DD
14.6.1 Setting up DMA transfers
14.6.2 Finding the DMA Descriptor
14.6.3 Transferring the Data
14.6 Isochronous endpoint operation
For an IN transfer, if the system does not have any data to send for a while, it can respond
to an NDDR interrupt by programming a No_Packet DD. This is done by setting both the
Max_packet_size and DMA_buffer_length fields in the DD to 0. On processing a
No_Packet DD, the DMA engine clears the DMA request bit in USBDMARSt
corresponding to the endpoint without transferring a packet. The DD is retired with a
status code of NormalCompletion. This can be repeated as often as necessary. The
device will respond to IN token packets on the USB bus with a NAK until a DD with a data
packet is programmed and the DMA transfers the packet into the endpoint buffer.
For isochronous endpoints, the packet size can vary for each packet. There is one packet
per isochronous endpoint for each frame.
Software sets the isochronous endpoint bit to 1 in the DD, and programs the initial value of
the Isochronous_packetsize_memory_address field. All other fields are initialized the
same as for non-isochronous endpoints.
For isochronous endpoints, the DMA_buffer_length and Present_DMA_count fields are in
frames rather than bytes.
Finding the descriptors is done in the same way as that for a non-isochronous endpoint.
A DMA request will be placed for DMA-enabled isochronous endpoints on every FRAME
interrupt. On processing the request, the DMA engine will fetch the descriptor and if
Isochronous_endpoint is set, will fetch the Isochronous_packetsize_memory_address
from the fifth word of the DD.
The data is transferred to or from the memory location DMA_buffer_start_addr. After the
end of the packet transfer the Present_DMA_count value is incremented by 1.
USB transfer end completion - If the current packet is fully transferred and its size is
less than the Max_packet_size field, and the end of the DMA buffer is still not reached,
the USB transfer end completion occurs. The DD will be written back to the memory
with DD_retired set and DD_Status set to the DataUnderrun completion code. The EOT
interrupt is raised for this endpoint.
Error completion - If the current packet is partially transferred i.e. the end of the DMA
buffer is reached in the middle of the packet transfer, an error situation occurs. The DD
is written back with DD_retired set and DD_status set to the DataOverrun status code.
The EOT interrupt is raised for this endpoint and the corresponding bit in USBEpDMASt
register is cleared. The packet will be re-sent from the endpoint buffer to memory when
the corresponding EPxx_DMA_ENABLE bit is set again using the USBEpDMAEn
register.
Rev. 04 — 26 August 2009
Chapter 13: LPC24XX USB device controller
UM10237
© NXP B.V. 2009. All rights reserved.
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