am79c875 Advanced Micro Devices, am79c875 Datasheet - Page 47

• Manufacturer Part Number: am79c875
• Description: Netphy ?lp Low Power Quad 10/100-tx/fx Ethernet Transceiver
• Manufacturer: Advanced Micro Devices

B4.5) Full Duplex operation with Auto-Negotiation Disabled
SYMPTOM:
IMPLICATION:
WORKAROUND:
STATUS:
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.
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.
Full-duplex operation must be set through management pins, Register 0, bit 8.
This errata will not be fixed.
Am79C875
47