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AM79C90PC 데이터시트(PDF) 61 Page - Advanced Micro Devices

부품명 AM79C90PC
상세설명  CMOS Local Area Network Controller for Ethernet (C-LANCE)
PDF  62 Pages
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제조업체  AMD [Advanced Micro Devices]
홈페이지  http://www.amd.com
Logo AMD - Advanced Micro Devices

AM79C90PC 데이터시트(HTML) 61 Page - Advanced Micro Devices

Back Button AM79C90PC Datasheet HTML 54Page - Advanced Micro Devices AM79C90PC Datasheet HTML 55Page - Advanced Micro Devices AM79C90PC Datasheet HTML 56Page - Advanced Micro Devices AM79C90PC Datasheet HTML 57Page - Advanced Micro Devices AM79C90PC Datasheet HTML 58Page - Advanced Micro Devices AM79C90PC Datasheet HTML 59Page - Advanced Micro Devices AM79C90PC Datasheet HTML 60Page - Advanced Micro Devices AM79C90PC Datasheet HTML 61Page - Advanced Micro Devices AM79C90PC Datasheet HTML 62Page - Advanced Micro Devices  
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Am79C90
61
17. Elimination of Burn-In Option
The burn-in option for the C-LANCE is no longer avail-
able. Thus, the ordering part number Am79C90PCB is
no longer valid (see page 4 of the C-LANCE data
sheet).
18. RX Descriptor Zero Buffer Byte Count Handling
The 12-bit BCNT field in the receive descriptor of the
LANCE and C-LANCE devices is loaded with the 2’s
complement of the number of bytes allocated to the
associated receive buffer. In the LANCE device, when
all 0’s are written to the BCNT field in a receive descrip-
tor, a buffer length of 4096 (212) bytes is assumed. In
the C-LANCE device, the case of all 0’s in the receive
descriptor may produce unpredictable results.
This difference should not cause problems in IEEE
802.3-compliant networks, because 802.3 has a maxi-
mum packet length specification of 1518 bytes.



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