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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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AM79C875KI датащи(PDF) 47 Page - Advanced Micro Devices |
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AM79C875KI датащи(HTML) 47 Page - Advanced Micro Devices |
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47 / 48 page  Am79C875 47 B4.5) Full Duplex operation with Auto-Negotiation Disabled SYMPTOM: If Auto-Negotiation is disabled, the device cannot be pin-strapped to full-duplex. LEDDPX[2]/ DPLX (Pin 41) should set the duplex at reset if LEDACT_LINK/ANEGA (Pin 39) is LOW at re- set. Instead, all 4 ports are half-duplex regardless of the setting of Pin 41. IMPLICATION: This is a minor issue which should not affect normal operation. Auto-Negotiation operation is usually set by default in systems today so that both link partners can operate at the highest set- ting (speed and duplex). Very rarely do systems rely on Parallel Detect to set the speed of the link. Note that RMII operation is by definition, full-duplex. WORKAROUND: Full-duplex operation must be set through management pins, Register 0, bit 8. STATUS: This errata will not be fixed. |
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