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DP8390D Fiches technique(PDF) 7 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
No de pièce DP8390D
Description  NIC Network Interface Controller
PDF  56 Pages
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Fabricant  NSC [National Semiconductor (TI)]
Site Internet  http://www.national.com
Logo NSC - National Semiconductor (TI)

DP8390D Fiches technique(HTML) 7 Page - National Semiconductor (TI)

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60 Direct Memory Access Control (DMA) (Continued)
Dual Bus System
TLF8582 – 55
32-Bit DMA Operation
TLF8582 – 6
70 Packet Reception
The Local DMA receive channel uses a Buffer Ring Struc-
ture comprised of a series of contiguous fixed length 256
byte (128 word) buffers for storage of received packets The
location of the Receive Buffer Ring is programmed in two
registers a Page Start and a Page Stop Register Ethernet
packets consist of a distribution of shorter link control pack-
ets and longer data packets the 256 byte buffer length pro-
vides a good compromise between short packets and long-
er packets to most efficiently use memory In addition these
buffers provide memory resources for storage of back-to-
back packets in loaded networks The assignment of buffers
NIC Receive Buffer Ring
TLF8582 – 7
7



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