Adaptec 1737100 Programmer Manual - Page 148

AIC-6915 Ethernet LAN Controller Programmer's Manual MaxLength Register Type: R/W Internal Registers Subgroup: MAC Registers Byte Address: 5014h - 5017h Bit(s) 31:16 15:0 Table 7-96. MaxLength Register Reset rw Value Description/Function r/w 0 Reserved: Always read as 0. r/w 1536 MaxPacketLength: Frames longer than the specified number of (600h) bytes are truncated unless the HUGEENABLE control bit in the configuration is asserted, in which case no transmit frame length is enforced. TxNibbleCnt Register Type: R/W Internal Registers Subgroup: MAC Registers Byte Address: 5018h- 501Bh Table 7-97. TxNibbleCnt Register Reset Bit(s) rw Value Description/Function 31:16 r/w 0 Reserved: Always read as 0. 15:0 r/w 0 TxNibbleCnt: This is a multiple purpose counter used internally to count the number of nibbles at different times. It should only be written for test purposes, such as testing the excess deferral function. TxByteCnt Register Type: R/W Internal Registers Subgroup: MAC Registers Byte Address: 501Ch - 501Fh Table 7-98. TxByteCnt Register Reset Bit(s) rw Value Description/Function 31:16 r/w 0 Reserved: Always read as 0. 15:0 r/w 0 TxByteCnt: This is a multipurpose counter used internally to count the number of bytes at different times. It should only be written for test purposes, such as testing frame functionality. 7-76