One Stop Systems, Inc. OSS-wanPCI-CxT1E1 User Manual
Rev. A
15
Reset LED
The reset LED is a yellow LED located on the primary side of the board near the top edge. The LED is on when the Board Reset
signal is active. The Board Reset signal is connected to the CN8474 and the four COMETs, and is the logical OR of the PCI Reset
signal with the status signals from both of the reset devices
.
JTAG
The JTAG chain supports the following mutually exclusive functions: JTAG and CPLD programming. During CPLD programming,
the chain is connected such that the devices other than the CPLD are excluded. During normal JTAG testing, all JTAG devices are
included in the chain.
The wanADAPT-CxT1E1 has six (6) components that are capable of JTAG functionality. EPM3256 CPLD, CN8474 and the four
COMETs capable of JTAG are connected in a chain. The board JTAG chain is not supported at the PCI connection. The following is
the JTAG chain order:
For
2-port and 1-port options, on-board 0-ohm resistors are used to bypass the appropriate COMETs.
Note
: Framer TDO signals will require 10K pull up resistors
JTAG TAP Pin Assignments
A standard JTAG Test Access Port (TAP) connector is used with the following pin assignments
:
ByteBlaster Pin Assignments
The table below is the Altera ByteBlasterMV connector’s pin assignments: The ByteBlaster plugs into a standard 10-pin shrouded
header. The key (i.e.,notch) should be oriented on the side with the configuration or programming signals, not on the side with VCC
and GND.
JTAG
EPM3256A
CN8474A6
Comet #3
Comet #2
Comet #1
Comet #0
#1
#2
#3
#4
#5
#6
JTAG
TAP
Connector
Pin
Assignments
Pin
#
Pin
#
JTAG
TAP
Connector
Pin
Assignments
/TRST
1
2
GND
TDI
3
4
GND
TDO
5
6
GND
TMS
7
8
GND
TCK
9
10
GND
ByteBlaster
Connector
Pin
Assignments
Pin
#
Pin
#
ByteBlaster
Connector
Pin
Assignments
TCK 1
2 GND
TDO 3
4 VCC
TMS
5
6
NC
NC
7
8
NC
TDI 9
10
GND
