LPC2458FET180,551 NXP Semiconductors, LPC2458FET180,551 Datasheet - Page 216
LPC2458FET180,551
Manufacturer Part Number
LPC2458FET180,551
Description
IC ARM7 MCU FLASH 512K 180TFBGA
Manufacturer
NXP Semiconductors
Series
LPC2400r
Specifications of LPC2458FET180,551
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
136
Program Memory Size
512KB (512K x 8)
Program Memory Type
FLASH
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
Package / Case
180-TFBGA
Processor Series
LPC24
Core
ARM7TDMI-S
Data Bus Width
32 bit
Data Ram Size
98 KB
Interface Type
CAN, Ethernet, I2C, I2S, IrDA, SPI, SSP, UART, USB
Maximum Clock Frequency
72 MHz
Number Of Programmable I/os
136
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, SAB-TFBGA180
Minimum Operating Temperature
- 40 C
On-chip Adc
10 bit, 8 Channel
On-chip Dac
10 bit, 1 Channel
Package
180TFBGA
Device Core
ARM7TDMI-S
Family Name
LPC2000
Maximum Speed
72 MHz
For Use With
622-1023 - BOARD SCKT ADAPTER FOR TFBGA180622-1005 - 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
568-4258
935282454551
LPC2458FET180-S
935282454551
LPC2458FET180-S
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
LPC2458FET180,551
Manufacturer:
MICROCHIP
Quantity:
1 103
Company:
Part Number:
LPC2458FET180,551
Manufacturer:
NXP Semiconductors
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UM10237_4
User manual
5.4 Overview of DMA operation
5.5 Ethernet Packet
Descriptors, which are stored in memory, contain information about fragments of incoming
or outgoing Ethernet frames. A fragment may be an entire frame or a much smaller
amount of data. Each descriptor contains a pointer to a memory buffer that holds data
associated with a fragment, the size of the fragment buffer, and details of how the
fragment will be transmitted or received.
Descriptors are stored in arrays in memory, which are located by pointer registers in the
Ethernet block. Other registers determine the size of the arrays, point to the next
descriptor in each array that will be used by the DMA engine, and point to the next
descriptor in each array that will be used by the Ethernet device driver.
The DMA engine makes use of a Receive descriptor array and a Transmit descriptor array
in memory. All or part of an Ethernet frame may be contained in a memory buffer
associated with a descriptor. When transmitting, the transmit DMA engine uses as many
descriptors as needed (one or more) to obtain (gather) all of the parts of a frame, and
sends them out in sequence. When receiving, the receive DMA engine also uses as many
descriptors as needed (one or more) to find places to store (scatter) all of the data in the
received frame.
The base address registers for the descriptor array, registers indicating the number of
descriptor array entries, and descriptor array input/output pointers are contained in the
Ethernet block. The descriptor entries and all transmit and receive packet data are stored
in memory which is not a part of the Ethernet block. The descriptor entries tell where
related frame data is stored in memory, certain aspects of how the data is handled, and
the result status of each Ethernet transaction.
Hardware in the DMA engine controls how data incoming from the Ethernet MAC is saved
to memory, causes fragment related status to be saved, and advances the hardware
receive pointer for incoming data. Driver software must handle the disposition of received
data, changing of descriptor data addresses (to avoid unnecessary data movement), and
advancing the software receive pointer. The two pointers create a circular queue in the
descriptor array and allow both the DMA hardware and the driver software to know which
descriptors (if any) are available for their use, including whether the descriptor array is
empty or full.
Similarly, driver software must set up pointers to data that will be transmitted by the
Ethernet MAC, giving instructions for each fragment of data, and advancing the software
transmit pointer for outgoing data. Hardware in the DMA engine reads this information and
sends the data to the Ethernet MAC interface when possible, updating the status and
advancing the hardware transmit pointer.
Figure 11–27
illustrates the different fields in an Ethernet packet.
Rev. 04 — 26 August 2009
Chapter 11: LPC24XX Ethernet
UM10237
© NXP B.V. 2009. All rights reserved.
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