LPC1767FBD100,551 NXP Semiconductors, LPC1767FBD100,551 Datasheet - Page 195
LPC1767FBD100,551
Manufacturer Part Number
LPC1767FBD100,551
Description
IC ARM CORTEX MCU 512K 100-LQFP
Manufacturer
NXP Semiconductors
Series
LPC17xxr
Datasheets
1.LPC1767FBD100551.pdf
(2 pages)
2.LPC1767FBD100551.pdf
(840 pages)
3.LPC1767FBD100551.pdf
(65 pages)
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
935289808551
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
LPC1767FBD100,551
Manufacturer:
NXP Semiconductors
Quantity:
10 000
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NXP Semiconductors
UM10360
User manual
10.17.7 Duplex modes
10.17.8 IEE 802.3/Clause 31 flow control
The Ethernet block can operate in full duplex and half duplex mode. Half or full duplex
mode needs to be configured by the device driver software during initialization.
For a full duplex connection the FullDuplex bit of the Command register needs to be set to
1 and the FULL-DUPLEX bit of the MAC2 configuration register needs to be set to 1; for
half duplex the same bits need to be set to 0.
Overview
For full duplex connections, the Ethernet block supports IEEE 802.3/clause 31 flow control
using pause frames. This type of flow control may be used in full-duplex point-to-point
connections. Flow control allows a receiver to stall a transmitter e.g. when the receive
buffers are (almost) full. For this purpose, the receiving side sends a pause frame to the
transmitting side.
Pause frames use units of 512 bit times corresponding to 128 rx_clk/tx_clk cycles.
Receive flow control
In full-duplex mode, the Ethernet block will suspend its transmissions when the it receives
a pause frame. Rx flow control is initiated by the receiving side of the transmission. It is
enabled by setting the ‘RX FLOW CONTROL’ bit in the MAC1 configuration register. If the
RX FLOW CONTROL’ bit is zero, then the Ethernet block ignores received pause control
frames. When a pause frame is received on the Rx side of the Ethernet block,
transmission on the Tx side will be interrupted after the currently transmitting frame has
completed, for an amount of time as indicated in the received pause frame. The transmit
data path will stop transmitting data for the number of 512 bit slot times encoded in the
pause-timer field of the received pause control frame.
By default the received pause control frames are not forwarded to the device driver. To
forward the receive flow control frames to the device driver, set the ‘PASS ALL RECEIVE
FRAMES’ bit in the MAC1 configuration register.
Transmit flow control
If case device drivers need to stall the receive data e.g. because software buffers are full,
the Ethernet block can transmit pause control frames. Transmit flow control needs to be
initiated by the device driver software; there is no IEEE 802.3/31 flow control initiated by
hardware, such as the DMA managers.
With software flow control, the device driver can detect a situation in which the process of
receiving frames needs to be interrupted by sending out Tx pause frames. Note that due
to Ethernet delays, a few frames can still be received before the flow control takes effect
and the receive stream stops.
Transmit flow control is activated by writing 1 to the TxFlowControl bit of the Command
register. When the Ethernet block operates in full duplex mode, this will result in
transmission of IEEE 802.3/31 pause frames. The flow control continues until a 0 is
written to TxFlowControl bit of the Command register.
All information provided in this document is subject to legal disclaimers.
Rev. 2 — 19 August 2010
Chapter 10: LPC17xx Ethernet
UM10360
© NXP B.V. 2010. All rights reserved.
195 of 840
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