AM79C874VC AMD (ADVANCED MICRO DEVICES), AM79C874VC Datasheet - Page 20

• Manufacturer Part Number: AM79C874VC
• Manufacturer: AMD (ADVANCED MICRO DEVICES)

Specifications of AM79C874VC

• Lead Free Status / RoHS Status: Not Compliant

MLT-3
This block is responsible for converting the NRZI data
stream from the PDX block to the MLT-3 encoded data
stream. The effect of MLT-3 is the reduction of energy
on the copper media (TX or FX cable) in the critical fre-
quency range of 1 MHz to 100 MHz. The receive sec-
tion of this block is responsible for equalizing and
amplifying the received data stream and link detection.
20
MII (TXD[3:0])
Undefined
Undefined
Undefined
Undefined
Undefined
Undefined
Undefined
Undefined
Undefined
Undefined
Undefined
Undefined
Undefined
Undefined
0 0 0 0
0 0 0 1
0 0 1 0
0 0 1 1
0 1 0 0
0 1 0 1
0 1 1 1
1 0 0 0
1 0 0 1
1 0 1 0
1 0 1 1
1 1 0 0
1 1 0 1
1 1 1 0
1 1 1 1
0 1 0 1
0 1 0 1
0 1 10
Name
C
D
R
H
A
B
E
F
K
T
V
V
V
V
V
V
V
V
V
V
0
1
2
3
4
5
6
7
8
9
J
I
Table 5. Code-Group Mapping
PCS Code-Group
D A T A
1 1 1 1 0
0 1 0 0 1
1 0 1 0 0
1 0 1 0 1
0 1 0 1 0
0 1 0 1 1
0 1 1 1 0
0 1 1 1 1
1 0 0 1 0
1 0 0 1 1
1 0 1 1 0
1 0 1 1 1
1 1 0 1 0
1 1 0 1 1
1 1 1 0 0
1 1 1 0 1
1 1 1 1 1
1 1 0 0 0
1 0 0 0 1
0 1 1 0 1
0 0 1 1 1
0 0 1 0 0
0 0 0 0 0
0 0 0 0 1
0 0 0 1 0
0 0 0 1 1
0 0 1 0 1
0 0 1 1 0
0 1 0 0 0
0 1 1 0 0
1 0 0 0 0
1 1 0 0 1
Am79C874
The adaptive equalizer compensates for the amplitude
and phase distortion due to the cable.
MLT-3 is a tri-level signal. All transitions are between
0 V and +1 V or 0 V and -1 V. A transition has a logical
value of 1 and a lack of a transition has a logical value
of 0. The benefit of MLT-3 is that it reduces the maxi-
mum frequency over the data line. The bit rate of TX
data is 125 Mbps. The maximum frequency (using
S H E E T
End-of-Stream Delimiter, Part 1 of 2; always used in
End-of-Stream Delimiter, Part 2 of 2; always used in
Start-of-Stream Delimiter, Part 1 of 2; always used
Start-of-Stream Delimiter, Part 2 of 2; always used
Transmit Error; used to force signaling errors
IDLE; used as inter-Stream fill code
Interpretation
in pairs with K
in pairs with J
Invalid Code
Invalid Code
Invalid Code
Invalid Code
Invalid Code
Invalid Code
Invalid Code
Invalid Code
Invalid Code
Invalid Code
pairs with R
pairs with T
Data A
Data B
Data C
Data D
Data E
Data 0
Data 1
Data 2
Data 3
Data 4
Data 5
Data 6
Data 7
Data 8
Data 9
Data F
22235K