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10/100 Mbps Ethernet Controller Family Open Source Software Developer Manual 125
Physical Layer Interface
7.3.2 Special Control Register: Register 17
Bit Name R / W Description Default
15 Scrambler Bypass RW
1 = Bypass Scrambler
0 = Normal operation
0
14 4/5 Bypass RW
1 = Bypass 4-bit to 5-bit
0 = Normal operation
0
13 Force Transmit H Pattern RW
1 = Force H pattern
0 = Normal operation
0
12 Force 34 Transmit Pattern RW
1 = Force 34 pattern
0 = Normal operation
0
11 Good Link RW
1 = 100BASE-TX good link indication, forcing to
ASD output
0 = Normal operation
0
9MDI Tristate RW
1 = Tri-state MDI interface
0 = Normal operation
0
8
Dynamic Power Down
Disable
RW
1 = Disable Dynamic Power Down.
0 = Normal operation
0
7
Auto-Negotiation
Loopback
RW
1 = Auto-negotiation loopback
0
= Auto negotiation normal Mode.
0
6 Reserved This bit is reserved. 0
5Filter Bypass RW
1 = Bypass filter
0 = Normal operation
0
4 Auto-Polarity Disable RW
1 = Disable auto-polarity
0 = Normal operation
0
3 Squelch Test Disable RW
1 = Disable 10BASE-T squelch test
0 = Normal squelch operation
0
2 Extended Squelch RW This bit indicates extended squelch control 0
1 Link Integrity Disable RW
1 = Disable link integrity operation
0 = Normal link integrity operation
0
0 Jabber Function disable RW
1 = Disable jabber function
0 = Normal jabber operation.
0