LPC1786 datasheet(49/120 Pages) NXP

49 / 120 page

LPC178X_7X

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Preliminary data sheet

Rev. 4 — 1 May 2012

49 of 120

NXP Semiconductors

LPC178x/7x

32-bit ARM Cortex-M3 microcontroller

7.14 Ethernet

Remark: The Ethernet block is available on parts LPC1788/86 and LPC1778/76.

The Ethernet block contains a full featured 10 Mbit/s or 100 Mbit/s Ethernet MAC

designed to provide optimized performance through the use of DMA hardware

acceleration. Features include a generous suite of control registers, half or full duplex

operation, flow control, control frames, hardware acceleration for transmit retry, receive

packet filtering and wake-up on LAN activity. Automatic frame transmission and reception

with scatter-gather DMA off-loads many operations from the CPU.

The Ethernet block and the CPU share the ARM Cortex-M3 D-code and system bus

through the AHB-multilayer matrix to access the various on-chip SRAM blocks for

Ethernet data, control, and status information.

The Ethernet block interfaces between an off-chip Ethernet PHY using the Media

Independent Interface (MII) or Reduced MII (RMII) protocol and the on-chip Media

Independent Interface Management (MIIM) serial bus.

7.14.1 Features

• Ethernet standards support:

– Supports 10 Mbit/s or 100 Mbit/s PHY devices including 10 Base-T, 100 Base-TX,

100 Base-FX, and 100 Base-T4.

– Fully compliant with IEEE standard 802.3.

– Fully compliant with 802.3x Full Duplex Flow Control and Half Duplex back

pressure.

– Flexible transmit and receive frame options.

– Virtual Local Area Network (VLAN) frame support.

• Memory management:

– Independent transmit and receive buffers memory mapped to shared SRAM.

– DMA managers with scatter/gather DMA and arrays of frame descriptors.

– Memory traffic optimized by buffering and pre-fetching.

• Enhanced Ethernet features:

– Receive filtering.

– Multicast and broadcast frame support for both transmit and receive.

– Optional automatic Frame Check Sequence (FCS) insertion with Circular

Redundancy Check (CRC) for transmit.

– Selectable automatic transmit frame padding.

– Over-length frame support for both transmit and receive allows any length frames.

– Promiscuous receive mode.

– Automatic collision back-off and frame retransmission.

– Includes power management by clock switching.

– Wake-on-LAN power management support allows system wake-up: using the

receive filters or a magic frame detection filter.

• Physical interface:

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