LPC1767FBD100,551 NXP Semiconductors, LPC1767FBD100,551 Datasheet - Page 192

• 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
UM10360
User manual
Fig 22. Receive Example Memory and Registers
0x200810EC
0x200810EC
0x200810FC
RxDescriptor
0x200810F0
0x200810F4
0x200810F8
0x20081100
0x20081104
0x20081108
1
1
1
1
descriptor array
CONTROL
CONTROL
CONTROL
CONTROL
0x20081409
0x20081411
0x20081419
0x20081325
PACKET
PACKET
PACKET
PACKET
After reset, the values of the DMA registers will be zero. During initialization, the device
driver will allocate the descriptor and status array in memory. In this example, an array of
four descriptors is allocated; the array is 4x2x4 bytes and aligned on a 4 byte address
boundary. Since the number of descriptors matches the number of statuses, the status
array consists of four elements; the array is 4x2x4 bytes and aligned on a 8 byte address
boundary. The device driver writes the base address of the descriptor array
(0x2008 10EC) in the RxDescriptor register, and the base address of the status array
(0x2008 11F8) in the RxStatus register. The device driver writes the number of descriptors
and statuses minus 1 (3) in the RxDescriptorNumber register. The descriptors and
statuses in the arrays need not be initialized yet.
After allocating the descriptors, a fragment buffer needs to be allocated for each of the
descriptors. Each fragment buffer can be between 1 byte and 2 k bytes. The base
address of the fragment buffer is stored in the Packet field of the descriptors. The number
of bytes in the fragment buffer is stored in the Size field of the descriptor Control word.
The Interrupt field in the Control word of the descriptor can be set to generate an interrupt
as soon as the descriptor has been filled by the receive process. In this example the
fragment buffers are 8 bytes, so the value of the Size field in the Control word of the
descriptor is set to 7. Note that in this example, the fragment buffers are actually a
7
7
7
7
All information provided in this document is subject to legal disclaimers.
FRAGMENT 0 BUFFER (8 bytes)
FRAGMENT 1 BUFFER (8 bytes)
FRAGMENT 2 BUFFER (3 bytes)
FRAGMENT 3 BUFFER (8 bytes)
Rev. 2 — 19 August 2010
fragment buffers
RxDescriptorNumber = 3
RxConsumeIndex
RxProduceIndex
0x200811F8
RxStatus
Chapter 10: LPC17xx Ethernet
StatusHashCRC
StatusHashCRC
StatusHashCRC
StatusHashCRC
StatusInfo
StatusInfo
StatusInfo
StatusInfo
status array
UM10360
© NXP B.V. 2010. All rights reserved.
7
7
2
7
0x 2008 11F8
0x 2008 1200
0x 2008 1208
0x 2008 1210
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