Presentation
A novel structure to achieve broadcastable IJTAG network
DescriptionThe increasing area and complexity for system-on-a-chip (SOC) designs, leading to highly demand and efficiency for chip testing. In order to achieve better controllability and observability, IEEE 1687 standard (IJTAG) is widely integrated in designs recently. Most processor chips are large-scale, and there are many duplicated cores. The configurations are same for most cases during testing. The test time will reduce significantly if the IJTAG network can be broadcast controlled. However, the TDR can not be broadcast controlled for IJTAG network, this means that the same data needs to be shifted multiple times and more shift cycles to every TDR even if the configuration of each TDR is the same. This disadvantage seriously affected the efficiency of configuration.
In this paper, we propose a broadcastable IJTAG network.
Two new broadcast signals BroadCast_TDI and BroadCast_Select are used to control SIBs. The BroadCast_TDI signal connects with TDI, it acts as data input when the IJTAG is in broadcast mode. The BroadCast_Select signal is controlled by a dedicate instruction. The IJTAG network will switch to broadcast mode if the BroadCast_Select signal asserted. In the broadcast mode, TDR can be configurated broadcastly.
The configuration cycles of TDR reduced a lot using broadcast IJTAG network and the efficiency of configuration is improved significantly.
In this paper, we propose a broadcastable IJTAG network.
Two new broadcast signals BroadCast_TDI and BroadCast_Select are used to control SIBs. The BroadCast_TDI signal connects with TDI, it acts as data input when the IJTAG is in broadcast mode. The BroadCast_Select signal is controlled by a dedicate instruction. The IJTAG network will switch to broadcast mode if the BroadCast_Select signal asserted. In the broadcast mode, TDR can be configurated broadcastly.
The configuration cycles of TDR reduced a lot using broadcast IJTAG network and the efficiency of configuration is improved significantly.
Event Type
Engineering Presentation
TimeTuesday, June 2411:15am - 11:30am PDT
Location2012, Level 2