LPC2470FET208,551 NXP Semiconductors, LPC2470FET208,551 Datasheet - Page 380
LPC2470FET208,551
Manufacturer Part Number
LPC2470FET208,551
Description
IC ARM7 MCU LCD 208-TFBGA
Manufacturer
NXP Semiconductors
Series
LPC2400r
Datasheets
1.OM11077.pdf
(792 pages)
2.LPC2470FET208551.pdf
(89 pages)
3.LPC2470FET208551.pdf
(91 pages)
Specifications of LPC2470FET208,551
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, LCD, POR, PWM, WDT
Number Of I /o
160
Program Memory Type
ROMless
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/I2C/I2S/SPI/SSP/UART/USB
Maximum Clock Frequency
72 MHz
Number Of Programmable I/os
160
Number Of Timers
4
Maximum Operating Temperature
+ 85 C
Mounting Style
SMD/SMT
3rd Party Development Tools
MDK-ARM, RL-ARM, ULINK2, MCB2470U
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
Operating Supply Voltage
3.3 V
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Eeprom Size
-
Program Memory Size
-
Lead Free Status / Rohs Status
Lead free / RoHS Compliant
Other names
568-4362
935284071551
LPC2470FET208-S
935284071551
LPC2470FET208-S
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LPC2470FET208,551
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LPC2470FET208,551
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UM10237_4
User manual
14.5.3 Transferring the data
14.5.4 Optimizing descriptor fetch
14.5.5 Ending the packet transfer
If a new descriptor has to be read, the DMA engine will calculate the location of the DDP
for this endpoint and will fetch the start address of the DD from this location. A DD start
address at location zero is considered invalid. In this case the NDDR interrupt is raised.
All other word-aligned addresses are considered valid.
When the DD is fetched, the DD status word (word 3) is read first and the status of the
DD_retired bit is checked. If not set, DDP points to a valid DD. If DD_retired is set, the
DMA engine will read the control word (word 1) of the DD.
If Next_DD_valid bit is set, the DMA engine will fetch the Next_DD_pointer field (word 0)
of the DD and load it to the DDP. The new DDP is written to the UDCA area.
The full DD (4 words) will then be fetched from the address in the DDP. The DD will give
the details of the DMA transfer to be done. The DMA engine will load its hardware
resources with the information fetched from the DD (start address, DMA count etc.).
If Next_DD_valid is not set and DD_retired bit is set, the DMA engine raises the NDDR
interrupt for this endpoint and clears the corresponding EPxx_DMA_ENABLE bit.
For OUT endpoints, the current packet is read from the EP_RAM by the DMA Engine and
transferred to the USB RAM memory locations starting from DMA_buffer_start_addr. For
IN endpoints, the data is fetched from the USB RAM at DMA_buffer_start_addr and
written to the EP_RAM. The DMA_buffer_start_addr and Present_DMA_count fields are
updated after each packet is transferred.
A DMA transfer normally involves multiple packet transfers. Hardware will not re-fetch a
new DD from memory unless the endpoint changes. To indicate an ongoing multi-packet
transfer, hardware sets an an internal flag called DMA_PROCEED.
The DMA_PROCEED flag is cleared after the required number of bytes specified in the
DMA_buffer_length field is transferred. It is also cleared when the software writes into the
USBEpDMADis register. The ability to clear the DMA_PROCEED flag allows software to
to force the DD to be re-fetched for the next packet transfer. Writing all zeros into the
USBEpDMADis register clears the DMA_PROCEED flag without disabling DMA operation
for any endpoint.
On completing a packet transfer, the DMA engine writes back the DD with updated status
information to the same memory location from where it was read. The
DMA_buffer_start_addr, Present_DMA_count, and the DD_status fields in the DD are
updated.
A DD can have the following types of completion:
Normal completion - If the current packet is fully transferred and the
Present_DMA_count field equals the DMA_buffer_length, the DD has completed
normally. The DD will be written back to memory with DD_retired set and DD_status set
to NormalCompletion. The EOT interrupt is raised for this endpoint.
Rev. 04 — 26 August 2009
Chapter 13: LPC24XX USB device controller
UM10237
© NXP B.V. 2009. All rights reserved.
380 of 792
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