Technical information

7-76
AIC-6915 Ethernet LAN Controller Programmer’s Manual
MaxLength Register
Type: R/W
Internal Registers Subgroup: MAC Registers
Byte Address: 5014h - 5017h
TxNibbleCnt Register
Type: R/W
Internal Registers Subgroup: MAC Registers
Byte Address: 5018h- 501Bh
TxByteCnt Register
Type: R/W
Internal Registers Subgroup: MAC Registers
Byte Address: 501Ch - 501Fh
Table 7-96. MaxLength Register
Bit(s) rw
Reset
Value Description/Function
31:16 r/w 0
Reserved:
Always read as 0.
15:0 r/w 1536
(600h)
MaxPacketLength:
Frames longer than the specified number of
bytes are truncated unless the
H
UGE
E
NABLE
control bit in the
configuration is asserted, in which case no transmit frame length is
enforced.
Table 7-97. TxNibbleCnt Register
Bit(s) rw
Reset
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.
Table 7-98. TxByteCnt Register
Bit(s) rw
Reset
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.