Hartmann Electronic GmbH
Backplanes
Motorstraße 43
Aufbausysteme (MPS)
Tel.: +49 711 1 39 89-0
Layoutservice
Fax: +49 711 8 66 11 91
[email protected]
www.hartmann-electronic.com
Geschäftsführer:
Registergericht Stgt. HRB 7630
Deutsche Bank AG, Singen
Werner Fritz
USt.-Id.-Nr. DE 147816208
BLZ 692 700 38 - Kto.-Nr. 050 1403 00
Dr. Günter Zahnenbenz
Steuer-Nr. 9908300985
Swift-Code DEUTDE6F692
10
SWDRV SWDTX (Signal integrity optimization)
“LODRV”, “HIDRV”, “DTX[0:3]”
In order to meet the different application needs, the driving current and equalization of each transmitting channels
can be adjusted using Dip Switches .The driver current of each channel is set to 20mA in default mode. To
change the current value, the user can strap
the pins either for nominal value (“HIDRV”, “LODRV”) or actual value (“DTX [3:0]”), which is a scaled multiple of
Inom. The following tables illustrate the possible transmitted current values the switch provides.
“RXEQCTL[1:0]”
In order to improve the data stream integrity across the channels, the receiver of each port of the Switch includes
a reception equalizer to mitigate the effects of ISI. The reception equalizer is implemented as a selectable high-
pass filter at the input node, and it is capable of removing as much as 0.4UI of ISI related jitter. The following
table shows a simple guideline for selecting the appropriate value to adapt with different lengths or connector
numbers in various applications.
Figure 5:
Adjustment of „RXEQTL[1:0“]
SWDRV
PIN
OFF=Default/ON Value
1-8
Bit0(L = OFF) - LODRV
Nominal Driver Current
2-7
Bit1(L = OFF) - HIDRV
00=20mA,01=10mA,10=28mA
3-6
Bit0(L = OFF) - RXEQCTL0
RX Equalizer Settings
4-5
Bit1(L = OFF) - RXEQCTL1
00=Jitter>0.25UI,Len>20",CON>=2,
01=Jitter>0.1UI<0.25UI,Len=8"-20",CON<=2,
1X=Jitter<0.1UI,Len<=8",CON<=1
Table 7:
Setup of Dip Switch SWDRV. Default setup is marked green.
SWDTX
PIN OFF=Default/ON
Value
1-8
Bit0(L = OFF) - DTX0
Multiple Nominal Driver Current
2-7
Bit1(L = OFF) - DTX1
DTX[3:0]
0000-0111 = 1.00-1.35 (+0.05)
3-6
Bit2(L = OFF) - DTX2
1000-1111 = 0.60-0.95 (+0.05)
4-5
Bit3(L = OFF) - DTX3
Table 8:
Setup of Dip Switch SWDTX. Default setup is marked green.
