NXP Semiconductors LPC43Sxx, User Manual

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User manual Rev. 2.1 — 10 December 2015 879 of 1441
NXP Semiconductors
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Chapter 28: LPC43xx/LPC43Sxx Ethernet
28.7.6.1 Initialization
Follow these steps to initialize the ethernet controller:
1. Write to DMA Register Table 630 to set Host bus access parameters.
2. Write to DMA Register Table 638 to mask unnecessary interrupt causes.
3. The software driver creates the Transmit and Receive descriptor lists. Then it writes to
both DMA Register Table 634 and DMA Register Table 635 , providing the DMA with
the starting address of each list.
4. Write to MAC Registers Table 603 , Table 605 , and Table 604 for desired filtering
options.
5. Write to MAC Register Table 602 to configure the operating mode and enable the
transmit operation (bit 3: Transmitter Enable). The PS and DM bits are set based on
the auto-negotiation result (read from the PHY).
6. Write to DMA Register Table 637 to set bits 13 and 1 to start transmission and
reception.
7. Write to MAC Register Table 602 to enable the Receive operation (bit 2: Receiver
Enable).
Fig 84. Descriptor ring and chain structure
Descriptor 0
Buffer 1
Buffer 2
Descriptor 1
Descriptor 2
Buffer 1
Buffer 2
Buffer 1
Buffer 2
Descriptor n
Buffer 1
Buffer 2
Ring Structure
Descriptor 0
Buffer 1
Chain Structure
Descriptor 1
Buffer 1
Descriptor 2
Buffer 1
Next Descriptor