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AX88780 Datasheet(PDF) 24 Page - ASIX Electronics Corporation |
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AX88780 Datasheet(HTML) 24 Page - ASIX Electronics Corporation |
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24 / 49 page  AX88780 1 = Full-Duplex mode 0 = Half-Duplex mode 5 RXFLW_EN R/W 0 RX Flow Control2 To enable RX flow control, driver MUST set this bit & bit8 of RX_CFG. 1 = enable Rx Flow control 0 = disable 4:1 - R/W 4’b0000 Reserved, must set to ‘0s’ for normal operation 0 - R/W 0 Reserved, must set to ‘0s’ for normal operation 4.17 MAC_CFG2--MAC Configuration2 Register Offset Address = FC48h Default = 32’h0000_0100 Field Name Type Default Description 15:8 - R/W 8’h01 Reserved, keep this field in default value for normal operation. 7:2 JamLT R/W 6’h0 Define Jam Limit for backpressure collision account. Normally set this field at 19h. It can avoid HUB port going to partition state due to too many collisions. AX88780 will skip one frame collision backpressure when collision counter equal to JamLT. The collision count will be reset to zero when every transmit frame with no collision or receive a frame with no backpressure collision. 1:0 - R/W 2’b00 Reserved, must set to ‘2’b00’ for normal operation 4.18 MAC_CFG3--MAC Configuration3 Register Offset Address = FC4Ch Default = 32’h0000_060E Field Name Type Default Description 15 NOABORT R/W 0 No Abort When this bit is enabled, MAC will keep retry transmit current frame even excessive collision otherwise it will abort current transmission due to excessive collision. 1 = enable 0 = disable 13:7 IPGR1 R/W 7’h0c Inter-Frame Gap segment1 6:0 IPGR2 R/W 7’h0E Inter-Frame Gap segment2 4.19 TXPAUT--TX Pause Time Register Offset Address= FC54h Default = 32’h001F_E000 Field Name Type Default Description 31:23 - R Reserved 22:0 TXPVAL R/W 23’h1F_E000 TX Pause Time out Driver must set this field to 23’h7F_8000 in initial stage for normal operation. It is used to re-transmit a pause-on frame when pause timer expired and receive buffer still not enough. 24 ASIX ELECTRONICS CORPORATION |
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