AX88179
USB 3.0 to 10/100/1000M Gigabit Ethernet Controller
6.2.2.14 Ethernet PHY Power and Reset Control Register (EPPRCR, 26h~27h, R/W)
Bit7
Bit6
Reserved
0
Bit5
Bit4
BZ
AutoDetach
Bit3
0
Bit2
BZ_TYP
Bit1
0
Bit0
0
WOLLP
Reserved
Reserved
BZ_TYP: The type of BZ bit. Define BZ bit whether it can auto-clear itself.
1: Disable that BZ auto-clears itself when it force hardware return a Zero-length packet (default).
0: Auto-clears BZ when it forces hardware return a Zero-length packet.
BZ: Force Bulk IN to return a Zero-length packet.
1: Software can force Bulk IN to return a zero-length USB packet.
0: Normal operation mode (default).
AutoDetach: Enable AutoDetach function with USB controller.
1: Enable.
0: Disable. It keeps chip attached When Ethernet cable unplug (default).
WOLLP: Enter WOL Low Power function in Suspend mode.
1: Force Internal Ethernet PHY into lowest speed after entering Suspend mode. This bit only effect if both PHYs are in
auto-negotiation mode with 10/100/1000M capacities.
0: Non-force Internal Ethernet PHY (default).
6.2.2.15 Jam Limit Count Register (JLCR, 29h, R/W)
Bit7
Bit6
Bit5
Bit4
Bit3
Bit2
Bit1
Bit0
0
Jam_Limit [5:0]
Jam_Limit [5:0]: This is used for flow-control in half-duplex mode, which is based on forced collision mechanisms to
backpressure transmitting network node. During the forced collision backpressure process, the Ethernet MAC will
continue counting total collision count. When it has reached the Jam_Limit setting, the Ethernet MAC will stop
backpressure to avoid Ethernet HUB from being partitioned (default = 3Fh) due to excessive collision on network link.
Bit 7, 6: Please always write 0 to these bits.
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