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LAN9117 데이터시트(PDF) 38 Page - Microchip Technology

부품명 LAN9117
부품 상세설명  High Performance Single-Chip 10/100 Non-PCI Ethernet Controller
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제조업체  MICROCHIP [Microchip Technology]
홈페이지  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

LAN9117 데이터시트(HTML) 38 Page - Microchip Technology

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LAN9117
DS00002267A-page 38
 2005-2016 Microchip Technology Inc.
3.13.1
TX BUFFER FORMAT
TX buffers exist in the host’s memory in a given format. The host writes a TX command word into the TX data buffer
before moving the Ethernet packet data. The TX command A and command B are 32-bit values that are used by the
LAN9117 in the handling and processing of the associated Ethernet packet data buffer. Buffer alignment, segmentation
and other packet processing parameters are included in the command structure. The following diagram illustrates the
buffer format.
FIGURE 3-13:
SIMPLIFIED HOST TX FLOW DIAGRAM
Idle
Check
available
FIFO
space
init
Write
TX
Command
Write
Buffer
Last Buffer in
Packet
Not Last Buffer
Write
Start
Padding
(optional)
Read TX
Status
(optional)
TX Status
Available


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