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DP83916 bảng dữ liệu(PDF) 68 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
tên linh kiện DP83916
Giải thích chi tiết về linh kiện  SONICTM-16 Systems-Oriented Network Interface Controller
PDF  96 Pages
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nhà sản xuất  NSC [National Semiconductor (TI)]
Trang chủ  http://www.national.com
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DP83916 bảng dữ liệu(HTML) 68 Page - National Semiconductor (TI)

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50 Bus Interface (Continued)
13 PCOMP will not be asserted (DCR2)
14 Packets will be accepted (not rejected) on CAM match
(DCR2)
A software reset immediately terminates DMA operations
and future interrupts The chip is put into an idle state where
registers can be accessed but the SONIC-16 will not be
active in any other way The registers are affected by a
software reset as shown in Table 5-4 (only the Command
Register is changed)
60 Network Interfacing
The SONIC-16 contains an on-chip ENDEC that performs
the network interfacing between the AUI (Attachment Unit
Interface) and the SONIC-16’s MAC unit A pin selectable
option allows the internal ENDEC to be disabled and the
MACENDEC signals to be supplied to the user for connec-
tion to an external ENDEC If the EXT pin is tied to ground
(EXTe0) the internal ENDEC is selected and if EXT is tied
to VCC (EXTe1) the external ENDEC option is selected
Internal ENDEC
When the internal ENDEC is used
(EXTe0) the interface signals between the ENDEC and
MAC unit are internally connected While these signals are
used internally by the SONIC-16 they are also provided as
an output to the user
(Figure 6-1)
The internal ENDEC allows for a 2-chip solution for the
complete Ethernet interface
Figure 6-2 shows a typical dia-
gram of the network interface
TLF11722 – 52
FIGURE 6-1 MAC and Internal ENDEC Interface Signals
68



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