VOH/VOL Test
© 2011 Advanced Micro Devices, Inc.
46136 AMD RX881 Databook 1.40
Proprietary
7-5
Figure 7-2 Sample of a Generic VOH/VOL Tree
The following is the truth table for the above VOH/VOL tree.
Refer to
Section 7.4.3
for the list of pins that are on the VOH/VOL tree. VOH/VOL Tree Activation
7.4.2
VOH/VOL Tree Activation
To activate the VOH/VOL tree and run a VOH/VOL test, perform the sequence below:
1. Supply a 10MHz clock to the REFCLK_P pin and a 10MHz differential clock pair to the HT_REFCLKP/N pins to
enable I/Os for testing.
2. Set POWERGOOD to 0.
3. Set TESTMODE to 1.
4. Set NC (ball E8) to 0.
5. Load JTAG instruction register with the instruction 0110 0011.
6. Load JTAG instruction register with the instruction 0010 0111.
7. Set POWERGOOD to 1.
1
6
5
4
3
2
VOH/VOL
mode
TEST_ODD
TEST_EVEN
Table 7-4 Truth Table for the VOH/VOL Tree Outputs
Test Vector
Number
TEST_ODD
Input
TEST_EVEN
Input
Output
Pin 1
Output
Pin 2
Output
Pin 3
Output
Pin 4
Output
Pin 5
Output
Pin 6
1
0
0
0
0
0
0
0
0
2
0
1
0
1
0
1
0
1
3
1
0
1
0
1
0
1
0
4
1
1
1
1
1
1
1
1