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AX88180 Datasheet(PDF) 23 Page - ASIX Electronics Corporation |
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AX88180 Datasheet(HTML) 23 Page - ASIX Electronics Corporation |
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23 / 47 page  AX88180 23 ASIX ELECTRONICS CORPORATION 4.17 MAC_CFG3--MAC Configuration3 Register Offset Address = 0xFC4C Default = 0x0000_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 0001100 Inter-Frame Gap segment1 6:0 IPGR2 R/W 0001110 Inter-Frame Gap segment2 4.18 TXPAUT--TX Pause Time Register Offset Address= 0xFC54 Default = 0x001F_E000 Field Name Type Default Description 31:23 - R All 0’s Reserved 22:0 TXPVAL R/W 0x1F_E000 TX Pause Time out It is used to re-transmit a pause-on frame when pause timer expired and receive buffer still not enough. In 32-bit mode, this field should be set to 0x1F_E000 at 1000Mbps mode and set to 0x7F_8000 at 10/100Mbps modes. In 16-bit mode, this field should be set to 0xFFFF at 10/100/1000Mbps modes. (Note: The bit 16 ~ 22 of this field are invalid in 16-bit mode.) 4.19 RXBTHD0--RX buffer Threshold0 Register Offset Address= 0xFC58 Default = 0x0000_0300 Field Name Type Default Description 31:11 - R All 0’s Reserved 10:0 RXLOWB R/W 0x300 RX Remainder Capacity Low-Bound This field defines as the remainder capacity of RX buffer for pause operation. If the flow control (bit12 of MAC_CFG0) is enabled, MAC will send pause frame when the available space of receive buffer is less than this value. The unit is 16-byte. 4.20 RXBTHD1--RX Buffer Threshold1 Register Offset Address= 0xFC5C Default = 0x0000_0600 Field Name Type Default Description 31:11 - R All 0’s Reserved 10:0 RXHIGHB R/W 0x600 RX Remainder Capacity Upper-Bound This field defines as upper bound of remainder size of RX buffer for pause operation. If the flow control is enabled, MAC will stop to send pause frame until the available space of receive buffer is more than this value. The unit is 16-byte. |
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