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DP83907 bảng dữ liệu(PDF) 16 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
tên linh kiện DP83907
Giải thích chi tiết về linh kiện  AT/LANTIC??II
PDF  70 Pages
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nhà sản xuất  NSC [National Semiconductor (TI)]
Trang chủ  http://www.national.com
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DP83907 bảng dữ liệu(HTML) 16 Page - National Semiconductor (TI)

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40 Functional Description (Continued)
TLF12082 – 8
FIGURE 13 Twisted Pair Interface Module Block Diagram
A second DMA channel (Remote DMA) is used as a slave
DMA to transfer data between the local buffer memory and
the host system The Local DMA and Remote DMA are in-
ternally arbitrated with the Local DMA channel having high-
est priority Both DMA channels use a common external bus
clock to generate all required bus timing External arbitration
is performed with a standard bus request bus acknowledge
handshake protocol
49 TWISTED PAIR INTERFACE MODULE
The TPI consists of five main logical functions
a) The ReceiverSmart Squelch responsible for determin-
ing when valid data is present on the differential receive
inputs (RXIg) and receiving the data
b) The Collision function checks for simultaneous transmis-
sion and reception of data on the TXOg and RXIg pins
c) The Link DetectorGenerator checks the integrity of the
cable connecting the two twisted pair MAUs
d) The Jabber disables the transmitter if it attempts to
transmit a longer than legal packet
e) The TX Driver and Pre-emphasis transmits Manchester
encoded data to the twisted pair network via the sum-
ming resistors and transformerfilter
16



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