AX88178
USB to 10/100/1000 Gigabit Ethernet/HomePNA Controller
6.2.1.18 Medium Status Register (1Ah, read only) and Medium Mode Register (1Bh, write only)
Bit7
PF
Bit6
JFE
Reserved
Bit5
TFC
Bit4
RFC
SM
Bit3
ENCK
SBP
Bit2
AC
Reserved
Bit1
FD
PS
Bit0
GM
RE
AA [7:0] = {PF, JFE, TFC, RFC, EN125, AC, FD, GM}.
BB [7:0] = {Reserved, SM, SBP, JE, PS, RE}.
GM: Gigabit Mode.
1: GMII mode.
0: MII mode (default).
PS: Port Speed in MII mode
1: 100 Mbps (default).
0: 10 Mbps.
{GM, PS} RGMII/MII/GMII port speed selection
00: 10Mbps
01: 100Mbps
10: 1000Mbps
11: 1000Mbps
FD: Full Duplex mode
1: Full Duplex mode (default).
0: Half Duplex mode.
AC: Reserved bit. For normal operation, please always write 1 to this bit.
ENCK: Enable GTX_CLK and TXC clock outputs
1: Enable.
0: Disabled (default).
ENCK RGMII_EN GTX_CLK TXC
0
0
1
1
0
1
0
1
OFF
OFF
ON
OFF
OFF
OFF
ON
OFF
RFC: RX Flow Control enable.
1: Enable receiving of pause frame on RX direction during full duplex mode (default).
0: Disabled.
TFC: TX Flow Control enable.
1: Enable transmitting pause frame on TX direction during full duplex mode (default).
0: Disabled.
JFE: Jumbo Frame Enable.
1: Enable the support of Jumbo frame in Gigabit mode (default).
0: Disabled.
PF: Check only “length/type” field for Pause Frame.
1: Enable, i.e., Pause frames are identified only based on L/T filed.
0: Disabled, i.e., Pause frames are identified based on both DA and L/T fields (default).
RE: Receive Enable.
1: Enable RX path of the ASIC.
0: Disabled (default).
SBP: Stop BackPressure.
1: When TFC bit = 1, setting this bit enables backpressure on TX direction “continuously” during RX buffer full
condition in half duplex mode.
0: When TFC bit = 1, setting this bit enable backpressure on TX direction “intermittently” during RX buffer full
condition in half duplex mode (default).
SM: Super Mac support.
1: Enable Super Mac to shorten exponential back-off time during transmit retry.
0: Disabled (default).
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ASIX ELECTRONICS CORPORATION
ASIX [ ASIX ELECTRONICS CORPORATION ]
