Texas Instruments LMK04131 Clock Jitter Cleaner with Cascade PLL LMK04131EVAL/NOPB LMK04131EVAL/NOPB Datenbogen
Produktcode
LMK04131EVAL/NOPB
L M K 0 4 1 X X - R E V 3 E V A L U A T I O N B O A R D O P E R A T I N G I N S T R U C T I O N S
SNLU099
42
Appendix I: Properly Configuring LPT Port
When trying to solve any communications issue, it is convenient to program the POWERDOWN
bit to confirm high/low current draw of the evaluation board or the PLL_MUX between “Logic
Low” and “Logic High” LD output to confirm successful communications.
bit to confirm high/low current draw of the evaluation board or the PLL_MUX between “Logic
Low” and “Logic High” LD output to confirm successful communications.
LPT Driver Loading
The parallel port must be configured for proper operation. To confirm that the LPT port driver is
successfully loading click “LPT/USB” “Check LPT Port.” If the driver properly loads then
the following message is displayed:
successfully loading click “LPT/USB” “Check LPT Port.” If the driver properly loads then
the following message is displayed:
Figure 23 - Successfully Opened LPT Driver
Successful loading of LPT driver does not mean LPT communications in CodeLoader are setup
properly. The proper LPT port must be selected and the LPT port must not be in an improper
mode.
The PC must be rebooted after install for LPT support to work properly.
Correct LPT Port/Address
To determine the correct LPT port in Windows, open the device manager (On Windows XP,
Start Settings Control Panel System Hardware Tab Device Manager) and check
the LPT port under the Ports (COM & LPT) node of the tree. It can be helpful to confirm that
the LPT port is mapped to the expected port address, for instance to confirm that LPT1 is really
mapped to address 0x378. This can be checked by viewing the properties of the LPT1 port and
viewing resources tab to verify that the I/O Range starts at 0x378. CodeLoader expects the a
traditional port mapping:
Start Settings Control Panel System Hardware Tab Device Manager) and check
the LPT port under the Ports (COM & LPT) node of the tree. It can be helpful to confirm that
the LPT port is mapped to the expected port address, for instance to confirm that LPT1 is really
mapped to address 0x378. This can be checked by viewing the properties of the LPT1 port and
viewing resources tab to verify that the I/O Range starts at 0x378. CodeLoader expects the a
traditional port mapping:
Port
Address
LPT1
0x378
LPT2
0x278
LPT3
0x3BC
If a non-standard address is used, use the “Other” port address in CodeLoader and type in the
port address in hexadecimal. It is possible to change the port address in the computer‟s BIOS
settings. The port address is set in CodeLoader at the Port Setup tab as shown in Figure 24.