发明名称 |
Clock tree synthesis for low cost pre-bond testing of 3D integrated circuits |
摘要 |
To enable low cost pre-bond testing for a three-dimensional (3D) integrated circuit, a backbone die may have a fully connected two-dimensional (2D) clock tree and one or more non-backbone die may have multiple isolated 2D clock trees. In various embodiments, clock sinks on the backbone die and the non-backbone die can be connected using multiple through-silicon-vias and the isolated 2D clock trees in the non-backbone die can be further connected via a Detachable tree (D-tree), which may comprise a rectilinear minimum spanning tree representing a shortest interconnect among the sinks associated with the 2D clock trees in the non-backbone die. Accordingly, the backbone die and the non-backbone die can be separated and individually tested prior to bonding using one clock probe pad, and the D-tree may be easily removed from the non-backbone die subsequent to the pre-bond testing by burning fuses at the sinks associated with the 2D clock trees. |
申请公布号 |
US9508615(B2) |
申请公布日期 |
2016.11.29 |
申请号 |
US201514617901 |
申请日期 |
2015.02.09 |
申请人 |
QUALCOMM Incorporated |
发明人 |
Lim Sung Kyu;Samadi Kambiz;Kamal Pratyush;Du Yang |
分类号 |
H01L23/58;H01L21/66;H01L25/065;H01L25/00;H01L23/538 |
主分类号 |
H01L23/58 |
代理机构 |
Muncy, Geissler, Olds & Lowe, P.C. |
代理人 |
Muncy, Geissler, Olds & Lowe, P.C. |
主权项 |
1. A method for pre-bond testing a three-dimensional integrated circuit, comprising:
building a fully connected two-dimensional (2D) clock tree on a backbone die; building multiple isolated 2D clock trees on one or more non-backbone die, wherein multiple through-silicon-vias connect the 2D clock tree in the backbone die and the multiple isolated 2D clock trees in the one or more non-backbone die; and connecting the multiple isolated 2D clock trees in the one or more non-backbone die using a Detachable tree (D-tree), wherein the D-tree comprises a root node and fuses located at sinks associated with the isolated 2D clock trees. |
地址 |
San Diego CA US |