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LAN89218 bảng dữ liệu(PDF) 57 Page - Microchip Technology

tên linh kiện LAN89218
Giải thích chi tiết về linh kiện  High-Performance Single-Chip 10/100 Ethernet Controller for Automotive Applications
PDF  148 Pages
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nhà sản xuất  MICROCHIP [Microchip Technology]
Trang chủ  http://www.microchip.com
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LAN89218 bảng dữ liệu(HTML) 57 Page - Microchip Technology

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 2008-2015 Microchip Technology Inc.
DS60001255B-page 57
LAN89218
3.13.1
RX SLAVE PIO OPERATION
Using PIO mode, the host can either implement a polling or interrupt scheme to empty the received packet out of
the RX data FIFO. The host will remain in the idle state until it receives an indication (interrupt or polling) that data
is available in the RX data FIFO. The host will then read the RX status FIFO to get the packet status, which will
contain the packet length and any other status information. The host should perform the proper number of reads, as
indicated by the packet length plus the start offset and the amount of optional padding added to the end of the frame,
from the RX data FIFO.
FIGURE 3-25:
HOST RECEIVE ROUTINE USING INTERRUPTS
FIGURE 3-26:
HOST RECEIVE ROUTINE WITH POLLING
Not Last Packet
Idle
Read RX
Status
DWORD
init
Read RX
Packet
Last Packet
RX Interrupt
Read
RX_FIFO_
INf
Read RX
Status
DWORD
init
Read RX
Packet
Last Packet
Not Last Packet
Valid Status DWORD



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