80220 Datasheet, PDF (40/91 Pages) LSI Computer Systems – 100BASE-TX/10BASE-T Ethernet Media Interface Adapter

80220/80221
Table 16. MI Register 16 (Configuration 1) Structure And Bit Definition
16.15
LNK_DIS
R/W
16.14
XMT_DIS
R/W
16.13
16.12
16.11
XMT_PDN TXEN_CRS BYP_ENC
R/W
R/W
R/W
16.10
BYP_SCR
R/W
16.7
CABLE
R/W
16.6
RLVL0
R/W
16.5
TLVL3
R/W
16.4
TLVL2
R/W
16.3
TLVL1
R/W
16.2
TLVL0
R/W
16.9
0
R/W
16.1
TRF1
R/W
16.8
EQLZR
R/W
16.0
TRF0
R/W
Bit Symbol
Name
Definition
R/W Def.
16.15 LNK_DIS
Link Disable
1 = Receive Link Detect Function Disabled
(Force Link Pass)
0 = Normal
R/W 0
16.14 XMT_DIS
TP Transmit
Disable
1 = TP Transmitter Disabled
0 = Normal
R/W 0
16.13 XMT_PDN
TP Transmit
Powerdown
1 = TP Transmitter Powered Down
0 = Normal
R/W 0
16.12 TXEN_CRS TXEN to CRS
1 = TX_EN to CRS Loopback Disabled
Loopback Disable 0 = Enabled
R/W 0
16.11 BYP_ENC
Bypass
Encoder/Decoder
Select
1 = Bypass 4B5B Encoder/Decoder
0 = No Bypass
R/W 0
16.10 BYP_SCR
Bypass
Scrambler/Descr-
ambler Select
1 = Bypass Scrambler/Descrambler
0 = No Bypass
R/W 0
16.9 UNSCR_DIS Unscrambled Idle 1 = Disable AutoNegotiation with devices that
Reception Disable
transmit unscrambled idle on powerup and
various instances
R/W 0
0 = Enables AutoNegotiation with devices that
transmit unscramblled idle on powerup and
various instances
16.8 EQLZR
Receive Equalizer 1 = Receive Equalizer Disabled, Set To 0 Length R/W 0
Select
0 = Receive Equalizer On (For 100Mb Mode Only)
16.7 CABLE
Cable Type Select 1 = STP (150 Ohm)
0 = UTP (100 Ohm)
R/W 0
16.6 RLVL0
Receive Input
Level Adjust
1 = Receive Squelch Levels Reduced By 4.5 dB
0 = Normal
R/W 0
16.5 TLVL3
16.4 TLVL2
16.3 TLVL1
16.2 TLVL0
Transmit Output
Level Adjust
See Table 3
R/W 1
0
0
0
16.1 TRF1
16.0 TRF0
Transmitter
Rise/Fall Time
Adjust
11 = -0.25 nS
10 = +0.0 nS
01 = +0.25 nS
00 = +0.50 nS
R/W 1
0
x.15 Bit Is Shifted First
40
MD400159/E