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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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AM79C940VCW датащи(PDF) 73 Page - Advanced Micro Devices |
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AM79C940VCW датащи(HTML) 73 Page - Advanced Micro Devices |
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73 / 122 page  AMD 73 Am79C940 Loopback Functions Loop [1–0] Function 00 No Loopback 01 External Loopback 10 Internal Loopback, excludes MENDEC 11 Internal Loopback, includes MENDEC External loopback allow the MACE device to transmit to the physical medium, using either the AUI, 10BASE-T, DAI or GPSI port, dependent on the PORTSEL [1–0] bits in the PLS Configuration Control register. Using the internal loopback test will ensure that transmission does not disturb the physical me- dium and will prohibit frame re- ception from the network. One Internal loopback function in- cludes the MENDEC in the loop. Bit 0 RES Reserved. Read as zero. Always write as zero. Reserved Test Register 1 (RTR1) (REG ADDR 30) Reserved for AMD internal use only. Reserved Test Register 2 (RTR2) (REG ADDR 31) Reserved for AMD internal use only. |
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