LPC1767FBD100,551 NXP Semiconductors, LPC1767FBD100,551 Datasheet - Page 145

• 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
10.7 Ethernet Packet
UM10360
User manual
Fig 18. Ethernet packet fields
start-of-frame
delimiter
1 byte
PREAMBLE
DESTINATION
DesA
oct(0)
7 bytes
oct6
LSB
ADDRESS
DesA
oct(1)
oct5
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 18
A packet consists of a preamble, a start-of-frame delimiter and an Ethernet frame.
ADDRESS
SOURCE
oct(2)
DesA
oct4
illustrates the different fields in an Ethernet packet.
oct(3)
DesA
oct3
OPTIONAL
VLAN
All information provided in this document is subject to legal disclaimers.
oct(4)
DesA
oct2
Rev. 2 — 19 August 2010
TYPE
oct(5)
DesA
LEN
oct1
ethernet packet
oct(6)
SrcA
oct6
time
ETHERNET FRAME
oct(7)
SrcA
MSB
oct5
SrcA
oct4
PAYLOAD
SrcA
oct3
SrcA
Chapter 10: LPC17xx Ethernet
oct2
SrcA
oct1
UM10360
© NXP B.V. 2010. All rights reserved.
FCS
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