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AX88780 Datasheet(PDF) 25 Page - ASIX Electronics Corporation |
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AX88780 Datasheet(HTML) 25 Page - ASIX Electronics Corporation |
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25 / 55 page  AX88780 25 ASIX ELECTRONICS CORPORATION until the waiting time is expired. 1 = enable 0 = disable 4:1 - R/W 0000 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 = 0xFC48 Default = 0x0000_0100 Field Name Type Default Description 15:8 - R/W 0x01 Reserved, keep this field in default value for normal operation. 7:2 JamLT R/W 000000 Define Jam Limit for backpressure collision account. Normally set this field at 0x19. 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 00 Reserved, must set to ‘00’ for normal operation 4.18 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 4.19 TXPAUT--TX Pause Time Register Offset Address= 0xFC54 Default = 0x001F_E000 Field Name Type Default Description 31:23 - R 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 0x7F_8000. In 16-bit mode, this field should be set to 0xFFFF at 10/100Mbps modes. (Note: The bit 16 ~ 22 of this field are invalid in 16-bit mode.) 4.20 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 MACCFG0) is enabled, MAC will send pause frame when the available space of receive buffer is less than this value. The unit is 16-byte. |
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