Improper Connections; Improper Or Unstable Vcc - Xilinx EZTag User Manual

EZTag with Workstations

Improper Connections

Always make sure that XChecker leads are connected properly.
Note: Connecting the XChecker leads to the wrong signal will cause
permanent damage to XChecker internal hardware. You must
connect V
For workstations, you must have read and write permissions to the
port to which you connect the XChecker cable. EZTag might issue a
message stating that the cable is not connected to port ttyx. When you
see this message, follow the check list below:
The result should be the following:
If you use a port to connect a modem or a remote login, you cannot
use that port. The port must be on. Consult your System
Administrator if the information the /etc/ttyab file if different than
what is listed in the aforementioned list.
Improper or Unstable V
Never connect the control signals to XChecker before V
ground. Xilinx recommends the following sequence:
1. Turn off power to the target system.
2. Connect V
4-14
to +5 V and gnd to ground.
CC
The board must have the power on, since the XChecker Cable uses
power from the board.
Check the device driver using the following command string:
ls –l /dev/ttya /dev/ttyb
crw-rw-rw- 1 root12,0 month date time /dev/ttya
crw-rw-rw- 1 root12,1 month date time /dev/ttyb
Reconnect the XChecker cable to another valid port.
Read the /etc/ttyab file. There should be two lines, as follows:
ttya ''/usr/etc/getty std.9600'' unknown
local secure
ttyb ''/usr/etc/getty std.9600'' unknown
local secure
CC
, ground, and then the signal leads,
CC
off
off
and
CC
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