Texas Instruments DS80PCI800EVK Evaluation Module DS80PCI800EVK/NOPB DS80PCI800EVK/NOPB Datenbogen
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Produktcode
DS80PCI800EVK/NOPB
4
DS80PCI800EVK User’s Guide
October 2012
2.6. Set the output VOD and De-emphasis level.
For external pin mode control for the VOD and De-emphasis level (Gen1&2 only):
Set ENSMB = 0 (1kohm to GND) by using the SW2 (3-2-1) = (ON-OFF-OFF).
SW4 pin1,2 must be set to the OFF positions, so the SMBUS signals are disconnected.
Refer to Table 1 for information on the 3 switch settings for the 4 level input.
Example:
Set DEMB[1:0] with SW5 for the B bank of outputs (top 4 outputs of DS80PCI800).
SW5 (6-5-4), (3-2-1) = (ON-OFF-OFF), (OFF-OFF-ON) = DEMB[1:0] = 0,1 (VOD=1.0V, DE=0 dB).
Set DEMA[1:0] with SW3 for the A bank of outputs (bottom 4 outputs of DS80PCI800).
SW3 (6-5-4), (3-2-1) = (ON-OFF-OFF), (OFF-OFF-ON) = DEMA1:0] = 0,1 (VOD=1.0V, DE=0 dB).
Table 4: 16 settings of VOD and DE when in pin mode
Level
DEMA/B[1:0]
SW5 - DEMB[1:0]
SW3 - DEMA[1:0]
SW3 - DEMA[1:0]
GEN1,2,3
6
5
4
3
2
1
VOD (Vp-p)
DE (dB)
1
0, 0
ON
OFF
OFF
ON
OFF
OFF
0.8
0
2
0, R
ON
OFF
OFF
OFF
ON
OFF
0.9
0
3
0, F
ON
OFF
OFF
OFF
OFF
OFF
0.9
-3.5
4
0, 1
ON
OFF
OFF
OFF
OFF
ON
1.0
0
5
R, 0
OFF
ON
OFF
ON
OFF
OFF
1.0
-3.5
6
R, R
OFF
ON
OFF
OFF
ON
OFF
1.0
-6
7
R, F
OFF
ON
OFF
OFF
OFF
OFF
1.1
0
8
R ,1
OFF
ON
OFF
OFF
OFF
ON
1.1
-3.5
9
F ,0
OFF
OFF
OFF
ON
OFF
OFF
1.1
-6
10
F, R
OFF
OFF
OFF
OFF
ON
OFF
1.2
0
11
F, F
OFF
OFF
OFF
OFF
OFF
OFF
1.2
-3.5
12
F, 1
OFF
OFF
OFF
OFF
OFF
ON
1.2
-6
13
1, 0
OFF
OFF
ON
ON
OFF
OFF
1.3
0
14
1, R
OFF
OFF
ON
OFF
ON
OFF
1.3
-3.5
15
1, F
OFF
OFF
ON
OFF
OFF
OFF
1.3
-6
16
1, 1
OFF
OFF
ON
OFF
OFF
ON
1.3
-9
2.7 SMBUS mode control of the EQ, VOD and De-emphasis level:
Set ENSMB = 1 (1kohm to VIH) by using the SW2 (3-2-1) = (OFF-OFF-ON).
Set SW4 pin1,2 to the ON position so the SMBUS signals are connected.
Set SW3 pin1 thru pin6 switches to the OFF position so they do not connect to the SDA and SCL line.
Set the SW1 and SW5 for the AD[3:0] pins. AD[3:0]=0000 sets device slave address = B0’hex.
Connect SDA, SCL and GND to J17. Please refer to datasheet for register map for EQ, VOD and DEM.