Scalable non-blocking switching network for programmable logic
View Patent ↗A scalable non-blocking switching network (SN) having switches and intermediate (stages of) conductors that are used to connect a first plurality of conductors to other multiple sets of conductors in a generally unrestricted fashion within respective interconnect resources constraints. The SN can be applied in a wide range of applications, in tandem or hierarchically, to provide a large switch network used in network, routers, and programmable logic circuits. The SN is used to connect a first set of conductors, through the SN, to multiple sets of conductors in a given logic circuit hierarchy whereby the conductors in each of the multiple sets are equivalent or exchangeable, which in term, by construction, makes the first set of conductors equivalent when used in the next level of circuit hierarchy. The SN is scalable for large sized sets of conductors and can be used hierarchically to enable programmable interconnections among large sized circuits.
1. An integrated circuit, comprising a L-level permutable switching network (L-PSN);
wherein the L-PSN comprises (L+2) levels of conductors and (L+1) sets of switches:
wherein the (L+2) levels of conductors comprises:
for i=[1:L], (I[i]/D[i])>1, D[i]>1, L≧1, at least one j selected from [1:L] with D[j]>2, each of the i-th level of conductors comprises I[i] number of conductors comprising D[i] sets of conductors;
an 0-th level of conductors of I[0] number of conductors,
wherein (I[0]/Π i=[1:L] D[i])>1; and
an (L+1)-th level of conductors of I[L+1] number of conductors comprising D[L+1] sets of conductors,
wherein D[L+1]>2 and each of the D[L+1] sets of conductors comprises Π i=[1:L] D[i] number of conductors;
wherein each i-th set of the (L+1) sets of switches comprises (I[i−1]×D[i]) number of switches for i=[1:L+1];
wherein the I[i−1] number of conductors of the (i−1)-th level of conductors selectively couple to (I[i]/D[i]) number of conductors in each of the D[i] sets of conductors of the i-th level of conductors through a respective I[i−1] number of switches of the i-th set of switches for i=[1:L+1] without requiring traversal of any other conductors;
wherein the Π i=[1:L] D[i] number of conductors in each of the D[L+1] sets of conductors of the (L+1)-th level of conductors are physically connected to a corresponding number of pins of a corresponding module selected from switching networks and logic cells; and
at least one j selected from [1:L+1], D S [j]=D[j]×(I[j−1]/I[j]), wherein each conductor in each of the D[j] sets of conductors of the I[j] number of conductors of the j-th level of conductors selectively couples to D S [j] number of conductors of the I[j−1] number of conductors of the (j−1)-th level of conductors through a respective D S [j] number of switches of the j-th set of switches without requiring traversal of any other conductors,
wherein a D[j] number of conductors comprising one conductor selected from each of the D[j] sets of conductors, and
wherein each conductor of the D[j] number of conductors selectively couples, through a respective D S [j] number of switches of the j-th set of switches, a same D S [j] number of conductors of the I[j−1] number of conductors without requiring traversal of any other conductors.
2. The integrated circuit of claim 1 , wherein the I[j−1] number of conductors of the (j−1)-th level of conductors comprises (I[j−1]/D S [j]) groups of D S [j] number of conductors, and
wherein the D S [j] number of conductors of each of the (I[j−1]/D S [j]) groups selectively couple to one conductor in each of the D[j] sets of conductors of the I[j] number of conductors of the j-th level of conductors through a respective D S [j] number of switches of the j-th set of switches without requiring traversal of any other conductors.
3. The integrated circuit of claim 1 , wherein the I[j] number of conductors of the j-th level of conductors comprises (I[j]/D[j]) groups of D[j] number of conductors,
wherein the D[j] number of conductors of the (I[j]/D[j]) groups comprising one conductor selected from each of the D[j] sets of conductors; and
wherein the D[j] number of conductors of each of the (I[j]/D[j]) groups selectively couple, through (D[j]×D S [j]) number of switches of the j-th set of switches, a same D S [j] number of conductors without requiring traversal of any other conductors.
4. A method to manufacture an integrated circuit, comprising:
fabricating a L-level permutable switching network (L-PSN),
wherein the L-PSN comprises (L+2) levels of conductors and (L+1) sets of switches:
wherein the (L+2) levels of conductors comprises:
for i=[1:L], (I[i]/D[i])>1, D[i]>1, L≧1, at least one j selected from [1:L] with D[j]>2, each of the i-th level of conductors comprises I[i] number of conductors comprising D[i] sets of conductors;
an 0-th level of conductors of I[0] number of conductors,
wherein (I[0]/Π i=[1:L] D[i])>1; and
an (L+1)-th level of conductors of I[L+1] number of conductors comprising D[L+1] sets of conductors,
wherein D[L+1]>2 and each of the D[L+1] sets of conductors comprises Π i=[1:L] D[i] number of conductors;
wherein each i-th set of the (L+1) sets of switches comprises (I[i−1]×D[i]) number of switches for i=[1:L+1];
selectively coupling the I[i−1] number of conductors of the (i−1)-th level to (I[i]/D[i]) number of conductors in each of the D[i] sets of conductors of the i-th level of conductors through a respective I[i−1] number of switches of the i-th set of switches for i=[1:L+1] without requiring traversal of any other conductors;
physically connecting the Π i=[1:L] D[i] number of conductors in each of the D[L+1] sets of conductors of the (L+1)-th level of conductors to a corresponding number of pins of a corresponding module selected from switching networks and logic cells; and
selecting at least one j=[1:L+1], D S [j]=D[j]×(I[j−1]/I[j]), selectively coupling each conductor in each of the D[j] sets of conductors of the I[j] number of conductors of the j-th level of conductors to D S [j] number of conductors of the I[j−1] number of conductors of the (j−1)-th level of conductors through a respective D S [j] number of switches of the j-th set of switches without requiring traversal of any other conductors,
wherein a D[j] number of conductors comprising one conductor selected from each of the D[j] sets of conductors, and
selectively coupling each conductor of the D[j] number of conductors, through a respective D S [j] number of switches of the j-th set of switches, to a same D S [j] number of conductors of the I[j−1] number of conductors without requiring traversal of any other conductors.
5. The method of claim 4 , wherein the I[j−1] number of conductors of the (j−1)-th level of conductors comprises (I[j−1]/D S [j]) groups of D S [j] number of conductors, and
selectively coupling the D S [j] number of conductors of each of the (I[j−1]/D S [j]) groups to one conductor in each of the D[j] sets of conductors of the I[j] number of conductors of the j-th level of conductors through a respective D S [j] number of switches of the j-th set of switches without requiring traversal of any other conductors.
6. The method of claim 4 , wherein the I[j] number of conductors of the j-th level of conductors comprises (I[j]/D[j]) groups of D[j] number of conductors,
selecting the D[j] number of conductors comprising one conductor from each of the D[j] sets of conductors; and
selectively coupling the D[j] number of conductors of each of the (I[j]/D[j]) groups, through (D[j]×D S [j]) number of switches of the j-th set of switches, to a same D S [j] number of conductors without requiring traversal of any other conductors.
7. An article of manufacture comprising a machine readable storage medium that stores data representing an integrated circuit layout, comprising: a L-level permutable switching network (L-PSN);
wherein the L-PSN comprises (L+2) levels of conductors and (L+1) sets of switches:
wherein the (L+2) levels of conductors comprises:
for i=[1:L], (I[i]/D[i])>1, D[i]>1, L≧1, at least one j selected from [1:L] with D[j]>2, each of the i-th level of conductors comprises I[i] number of conductors comprising D[i] sets of conductors;
an 0-th level of conductors of I[0] number of conductors,
wherein (I[0]/Π i=[1:L] D[i])>1; and
an (L+1)-th level of conductors of I[L+1] number of conductors comprising D[L+1] sets of conductors,
wherein D[L+1]>2 and each of the D[L+1] sets of conductors comprises Π i=[1:L] D[i] number of conductors;
wherein each i-th set of the (L+1) sets of switches comprises (I[i−1]×D[i]) number of switches for i=[1:L+1];
wherein the I[i−1] number of conductors of the (i−1)-th level of conductors selectively couple to (I[i]/D[i]) number of conductors in each of the D[i] sets of conductors of the i-th level of conductors through a respective I[i−1] number of switches of the i-th set of switches for i=[1:L+1] without requiring traversal of any other conductors;
wherein the Π i=[1:L] D[i] number of conductors in each of the D[L+1] sets of conductors of the (L+1)-th level of conductors are physically connected to a corresponding number of pins of a corresponding module selected from switching networks and logic cells; and
at least one j selected from [1:L+1], D S [j]=D[j]×(I[j−1]/I[j]), wherein each conductor in each of the D[j] sets of conductors of the I[j] number of conductors of the j-th level of conductors selectively couples to D S [j] number of conductors of the I[j−1] number of conductors of the (j−1)-th level of conductors through a respective D S [j] number of switches of the j-th set of switches without requiring traversal of any other conductors,
wherein a D[j] number of conductors comprising one conductor selected from each of the D[j] sets of conductors, and
wherein each conductor of the D[j] number of conductors selectively couples, through a respective D S [j] number of switches of the j-th set of switches, a same D S [j] number of conductors of the I[j−1] number of conductors without requiring traversal of any other conductors.
8. The article of manufacture of claim 7 , wherein the I[j−1] number of conductors of the (j−1)-th level of conductors comprises (I[j−1]/D S [j]) groups of D S [j] number of conductors, and
wherein the D S [j] number of conductors of each of the (I[j−1]/D S [j]) groups selectively couple to one conductor in each of the D[j] sets of conductors of the I[j] number of conductors of the j-th level of conductors through a respective D S [j] number of switches of the j-th set of switches without requiring traversal of any other conductors.
9. The article of manufacture of claim 7 , wherein the I[j] number of conductors of the j-th level of conductors comprises (I[j]/D[j]) groups of D[j] number of conductors,
wherein the D[j] number of conductors comprising one conductor selected from each of the D[j] sets of conductors; and
wherein the D[j] number of conductors of each of the (I[j]/D[j]) groups selectively couple, through (D[j]×D S [j]) number of switches of the j-th set of switches, a same D S [j] number of conductors without requiring traversal of any other conductors.