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The parallel download cable can be used with a single EPLD or
several connected in a boundary-scan chain to download and read-
back configuration data.
The transmission speed of the Parallel Download Cable is deter-
mined solely by the speed at which the host PC can transmit data
through its parallel port interface.
Connecting the Parallel Download Cable
On PCs you can connect the parallel cable to your system's parallel
printer port. The EZTag software will automatically identify the cable
when correctly connected to your PC. If you choose to, you may also
select this connection manually. To set up a parallel port manually:
Connection to Your Target System
You need appropriate pins on the target system for connecting the
target system board to the header connection on the cable. These
connectors must be standard 0.025−inch square male pins that have
dedicated traces to the target system control pins. You can connect to
these pins with a header connector or a flying lead connector.
Note: The parallel cable draws its power from the target system
through V
target system, must be stable. Do not connect any signals before
connecting V
Header Connector
When you layout the printed circuit board for use with JTAG in-
system programming and testing, a few adjustments will make the
process of connecting and downloading easier.
•
The header connector is a standard 9-pin (6 signals, 3 keys) header
connector that fits 0.025" square male pins. The pin order is listed in
Table 2-3. These header connectors are keyed to assure proper
orientation to the cable assembly.
EZTag User Guide
Cable
Parallel Port
and GND. Therefore, power to cable, as well as to the
CC
and ground.
CC
Provide header pins on your printed circuit board for VCC,
GND, TCK, TDI, TMS and TDO.
EZTag Download Cable Options
[ LPTn ]
2-9
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