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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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DP83916 датащи(PDF) 68 Page - National Semiconductor (TI) |
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DP83916 датащи(HTML) 68 Page - National Semiconductor (TI) |
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68 / 96 page  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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