Alliance Semiconductor AS91L1006BU handbook
The AS91L1006BU is a one-to-6-port JTAG gateway. It partitions a single JTAG chain into six separate chains. These separate chains can be optionally configured to operate as a single chain. The AS91L1006BU device is used to provide enhanced capabilities to the standard IEEE1149.1. It enables the IEEE1149.1 interface to be used in a true Multi-Drop environment without any additional signals. This Multi-Drop capability enables the standard IEEE1149.1 interface to be used not just for stand-alone PCB (Printed Circuit Board) testing, but also for complete system testing including all PCBs within a system back plane environment. The AS91L1006BU provides the capability of partitioning the PCB into multiple smaller IEEE1149.1 scan chains totally under software control. Partitioning the IEEE1149.1 chains on the PCB has several benefits including easier fault diagnostics capabilities as a fault on one of the IEEE1149.1 Local Scan Ports (LSPs) does not render the PCB untestable, faster flash programming on the PCBs, and removal of IEEE1149.1 signal loading issues. All of the protocols required for addressing the AS91L1006BU device via the Multi-Drop capability and the protocols for configuring which of the six IEEE1149.1 LSPs on the AS91L1006BU are to be used, is handled via 3rd party ATPG tools from vendors like Asset-Intertech and JTAG Technologies. In a Multi-Drop environment it is also possible to perform interconnect test
Brand: Alliance
File format: PDF
Size: 416 KB
MD5 Checksum: EF18D0C931419430997439AEDEFBA7E2
Publication date: 04 May, 2012
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PDF Link: Alliance Semiconductor AS91L1006BU handbook PDF