JTAG Bypass Module (only required for native XJTAG SW control)
FeaturesAllow single Tap XJTAG device to use the J-Testr
Bypasses the UUT JTAG connection when depowered Speeds up the JTAG communication Simple 2.54mm pitch mounting to interposer Includes current limit resistors for LED driving Includes pull down for RUN_SWITCH input Open Source Hardware Low cost |
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About
When a J-Testr is used with a JTAG system that has only one physical TAP (e.g. XJTAG XJLink1 ) or a single logical TAP (e.g. XJTAG XJLink2) the JTAG chain is required to be bypassed when the UUT is not powered.
Bypassing the JTAG chain also allows significantly faster communication to the J-Testr when communicating using the Native JTAG interface as it will remove large JTAG chains whilst communicating with the J-Testr.
The Interposer Bypass Card circuit is open source to allow the user to optionally intergrate directly to the interposer with any JTAG system they require.
NOTE:
Bypass is not required for most JTAG systems that have multiple TAPS that can be individually controlled.
Bypass is not required when communicating to the J-Testr with the Ethernet interface
Bypassing the JTAG chain also allows significantly faster communication to the J-Testr when communicating using the Native JTAG interface as it will remove large JTAG chains whilst communicating with the J-Testr.
The Interposer Bypass Card circuit is open source to allow the user to optionally intergrate directly to the interposer with any JTAG system they require.
NOTE:
Bypass is not required for most JTAG systems that have multiple TAPS that can be individually controlled.
Bypass is not required when communicating to the J-Testr with the Ethernet interface
Schematic
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Bill of Materials
| Interposer Bypass Card BOM |
