LPC2460FET208,551 NXP Semiconductors, LPC2460FET208,551 Datasheet - Page 257
![IC ARM7 MCU ROMLESS 208TFBGA](/photos/12/32/123248/mfg_lpc24xx_sml.jpg)
LPC2460FET208,551
Manufacturer Part Number
LPC2460FET208,551
Description
IC ARM7 MCU ROMLESS 208TFBGA
Manufacturer
NXP Semiconductors
Series
LPC2400r
Specifications of LPC2460FET208,551
Program Memory Type
ROMless
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
96K 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
Operating Supply Voltage
3.3 V
Maximum Operating Temperature
+ 85 C
Mounting Style
SMD/SMT
3rd Party Development Tools
MDK-ARM, RL-ARM, ULINK2, MCB2460, MCB2460U
Minimum Operating Temperature
- 40 C
On-chip Adc
8-ch x 10-bit
On-chip Dac
1-ch x 10-bit
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
For Use With
MCB2400U - BOARD EVAL MCB2400 + ULINK2MCB2400 - BOARD EVAL FOR NXP LPC246X SER
Eeprom Size
-
Program Memory Size
-
Lead Free Status / Rohs Status
Lead free / RoHS Compliant
Other names
568-4260
935283232551
LPC2460FET208-S
935283232551
LPC2460FET208-S
Available stocks
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Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
LPC2460FET208,551
Manufacturer:
NXP Semiconductors
Quantity:
10 000
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UM10237_4
User manual
(0x7FE0 11F8) to the TxStatus register. The device driver writes the number of descriptors
and statuses minus 1(3) to the TxDescriptorNumber register. The descriptors and
statuses in the arrays need not be initialized, yet.
At this point, the transmit datapath may be enabled by setting the TxEnable bit in the
Command register. If the transmit datapath is enabled while there are no further frames to
send the TxFinishedInt interrupt flag will be set. To reduce the processor interrupt load
only the desired interrupts can be enabled by setting the relevant bits in the IntEnable
register.
Now suppose application software wants to transmit a frame of 12 bytes using a TCP/IP
protocol (in real applications frames will be larger than 12 bytes). The TCP/IP stack will
add a header to the frame. The frame header need not be immediately in front of the
payload data in memory. The device driver can program the Tx DMA to collect header and
payload data. To do so, the device driver will program the first descriptor to point at the
frame header; the Last flag in the descriptor will be set to false/0 to indicate a
multi-fragment transmission. The device driver will program the next descriptor to point at
the actual payload data. The maximum size of a payload buffer is 2 kB so a single
descriptor suffices to describe the payload buffer. For the sake of the example though the
payload is distributed across two descriptors. After the first descriptor in the array
describing the header, the second descriptor in the array describes the initial 8 bytes of
the payload; the third descriptor in the array describes the remaining 4 bytes of the frame.
In the third descriptor the Last bit in the Control word is set to true/1 to indicate it is the last
descriptor in the frame. In this example the Interrupt bit in the descriptor Control field is set
in the last fragment of the frame in order to trigger an interrupt after the transmission
completed. The Size field in the descriptor’s Control word is set to the number of bytes in
the fragment buffer, -1 encoded.
Note that in real device drivers, the payload will typically only be split across multiple
descriptors if it is more than 2 kB. Also note that transmission payload data is forwarded to
the hardware without the device driver copying it (zero copy device driver).
After setting up the descriptors for the transaction the device driver increments the
TxProduceIndex register by 3 since three descriptors have been programmed. If the
transmit datapath was not enabled during initialization the device driver needs to enable
the datapath now.
If the transmit datapath is enabled the Ethernet block will start transmitting the frame as
soon as it detects the TxProduceIndex is not equal to TxConsumeIndex - both were zero
after reset. The Tx DMA will start reading the descriptors from memory. The memory
system will return the descriptors and the Ethernet block will accept them one by one
while reading the transmit data fragments.
As soon as transmission read data is returned from memory, the Ethernet block will try to
start transmission on the Ethernet connection via the (R)MII interface.
After transmitting each fragment of the frame the Tx DMA will write the status of the
fragment’s transmission. Statuses for all but the last fragment in the frame will be written
as soon as the data in the frame has been accepted by the Tx DMA manager. The status
for the last fragment in the frame will only be written after the transmission has completed
on the Ethernet connection.
Rev. 04 — 26 August 2009
Chapter 11: LPC24XX Ethernet
UM10237
© NXP B.V. 2009. All rights reserved.
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