
ASIX ELECTRONICS CORPORATION
21
AX88178 L
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
Bit6
Bit5
Bit4
Bit3
PF
JFE
TFC
RFC
ENCK
Reserved
SM
SBP
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 OFF OFF
0 1 OFF OFF
1 0 ON OFF
1 1 OFF ON
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 “l(fā)ength/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).
Bit2
AC
Bit1
FD
PS
Bit0
GM
RE
Reserved