AR# 15144: CORE Generator Gigabit Ethernet MAC (GMAC) - Software-driven resets do not work for a GMAC core
CORE Generator Gigabit Ethernet MAC (GMAC) - Software-driven resets do not work for a GMAC core
Keywords: GMAC, Gigabit, Ethernet, MAC, reset
General Description: The independent resets for Transmitter logic, Receiver logic and Flow Control logic of the GMAC core do not appear to function. According to the data sheet, writing to the appropriate configuration registers through the management interface should trigger these resets.
All versions up to and including version 2.1 of the 1Gb Ethernet MAC core contain a bug that affects reset routing. This bug is fixed in early- access version 3.0 builds of the 1Gb Ethernet MAC core.
Meanwhile, you can work around this problem by using the RESET port. This will simultaneously reset all logic blocks within the core.