CN101546345B - Method for planning power supply network and integrated circuit related with same - Google Patents
Method for planning power supply network and integrated circuit related with same Download PDFInfo
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- CN101546345B CN101546345B CN2008100884276A CN200810088427A CN101546345B CN 101546345 B CN101546345 B CN 101546345B CN 2008100884276 A CN2008100884276 A CN 2008100884276A CN 200810088427 A CN200810088427 A CN 200810088427A CN 101546345 B CN101546345 B CN 101546345B
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Abstract
The invention relates to a method for planning a power supply network, which is used in an integrated circuit, wherein the integrated circuit comprises a standard block and a standard block power supply line corresponding to a first direction. The method for planning the power supply network comprises the following steps: defining a power supply network which comprises a plurality of first power supply lines extending along the first direction and a plurality of second power supply lines extending along a second direction, wherein the plurality of the first power supply lines are positioned in a first metal layer; and the plurality of the second power supply lines are positioned in a second metal layer; and defining an auxiliary connection network in a third metal layer, wherein the auxiliary connection network comprises a plurality of auxiliary connecting lines extending along the second direction. The second metal layer is positioned above the first metal layer, and the third metal layer is positioned below the first metal layer.
Description
Technical field
The planing method that the present invention provides a kind of power supply network with and integrated circuit related with same, particularly a kind of planing method of power supply network of standard block with and integrated circuit related with same.
Background technology
In the design process of integrated circuit; Because APR (automatic placement and routing) instrument can help circuit designers easily circuit component to be positioned over the appropriate location of wafer; And also can help circuit designers to carry out the planning of power-supply wiring, so the APR instrument has become one of indispensable instrument of circuit designers.
In general, in the APR instrument, circuit component is to utilize two kinds of different blocks to plan; Wherein a kind of standard block (standard cell) that is referred to as, as its name suggests, the standard block is a kind of standardized block; It has specific size and fixing power source planning mode, and it is used for planning the standard circuit elements that some are commonly used, such as phase inverter, logic gate or the like; Thus, the APR instrument just can fitly be arranged in a plurality of standard blocks in the wafer area; Another kind then is referred to as huge collection block (macroblock), and huge collection block and standard block are different, and it does not have fixing size, and it is used for planning the specific function circuit that some circuit designers design, such as SRAM, ADC or the like circuit.
Yet; Though the APR instrument can be followed certain wiring rule; Standard block and standard block are suitably planned in the appropriate location of wafer area, and its power supply network (powermesh) is shown, still; Because the APR instrument can only plan standard that the part of details still is dependent on manual work and is carried out manual adjustment.Therefore, the APR instrument still has sizable room for improvement.
See also Fig. 1 at this, the standard block 100 that Fig. 1 is planned for traditional APR instrument and the stereographic map of standard regions block power supply supply line (standard cell power trunk) 110,120.In general; Under the planning principles of traditional APR instrument; As shown in Figure 1; Can respectively there be the standard regions block power supply supply line 110,120 of a horizontal direction both sides of standard block 100, and wherein power supply line 110 is used for external power source VDD is passed to standard block 100, and power supply line 120 then is used for ground power supply VSS is passed to standard block 100.
Please continue to consult Fig. 2, Fig. 2 shows the standard block 100 of Fig. 1, standard regions block power supply supply line 110,120, and the stereographic map that is positioned at the power supply network 200 on standard block 100 upper stratas.Note that for for simplicity at this, in Fig. 2, three row's standard blocks 100 only are shown, yet the standard block 100 on the actual wafer can be more.As shown in Figure 2, the part that is positioned at lower floor is standard block shown in Figure 1 and standard regions block power supply supply line 110,120, the power supply network 200 that the part on upper strata is then cooked up for traditional APR instrument.As shown in Figure 2; Power supply network 200 has the power supply line 210 of level and vertical power supply line 220; Wherein, vertical power supply line 220 is positioned at different metal layers with horizontal power supply line 210, and vertical power supply line 220 is positioned at the upper strata of horizontal power supply line 210; Wherein, horizontal power supply line 210 is perpendicular to one another with vertical power supply line 220 and forms a matrix; In addition, horizontal power supply line 210 comprises the power lead 211 and ground wire 212 of many configurations interlaced with each other, and vertical power supply line 220 also comprises the power lead 221 and ground wire 222 of many configurations interlaced with each other.
In addition; Power lead 211,221 must be coupled to external power source (not showing in the drawings); And power lead 211,221 must be coupled to aforesaid standard regions block power supply supply line 110 through via hole (via) and connector (via plug) 230, with in the voltage VDD importing standard block that external power source was provided 100; On the other hand, power lead 212,222 also must be coupled to ground voltage VSS, and must be coupled to standard regions block power supply supply line 120 through via hole and connector 230, ground voltage is imported in the standard block 100.Note that for concise explanation Fig. 2 and not shown horizontal power supply line 210 and standard regions block power supply supply line 110, the via hole between 120 230 at this; In addition; In general; Between the idiostatic power supply line in horizontal power supply line 210 and the vertical power supply line 220 (for example between 211 and 221, between 221 and 222); Also can interconnect through via hole and connector in the overlapping part of intersection, but in Fig. 2 for concise explanation, also do not demonstrate.
Note that because external power source VDD/ ground power supply VSS must import in the standard block 100 at this, generally can suitably design the resistance value between external power source to the standard block 100, so that integrated circuit obtains preferable usefulness; And the resistance value between external power source to the standard block 100 is directly related with the number of via hole/connector; Know like industry, the number of via hole/connector is many more, represents the resistance value between external power source to the standard block 100 can be by the parallel effect of resistance and reduce.Therefore, the position that via hole/connector can dispose is most important, is known by aforementioned, and the position that can dispose via hole/connector is many more, just represents the adjustable extent of resistance value big more.Therefore; General in the wiring rule of APR instrument; Often be designed at power supply line 210/220 overlapping, and the overlapping of power supply line 210 and power supply line 220, all build and put via hole and connector connects with standard regions block power supply supply line 110/120; Yet such design but can cause some problems.
See also Fig. 3 at this, Fig. 3 is the side view of the standard regions block power supply supply system 200 on standard regions block power supply supply line 110,120 and upper strata.In Fig. 3; Because horizontal power supply line 210 is positioned at the lower floor of vertical power supply line 220; Therefore horizontal power supply line 210 can be coupled to standard regions block power supply supply line 110/120 by via hole/connector 230 in the clear, and therefore aforesaid wiring mechanism can't meet with too big problem.But; For vertical power supply line 220; Owing to power supply line 220 and the standard regions block power supply supply line 110 on upper strata, might suffer between 120 that the power supply line 210 of level stops, the standard regions block power supply supply line 110,120 below the power supply line 220 that therefore is positioned at the upper strata may not be certain to be coupled to by via hole and connector; Thus, just limited the storing position of via hole/connector.In Fig. 3, be painted with figure " X " via hole/connector 230 representative via hole/connector that can't be provided with; That is the via hole/connector 230 of the standard regions block power supply supply line 110/120 below must being connected to by upper vertical power supply line 221/222 originally can receive stopping of horizontal vertical power supply line 210 and can't be provided with.
In addition; Aforesaid structure also can have another problem: except horizontal power supply line 210 can block the shortcoming of vertical power supply line 220 and the access path of lower floor's power supply line 110/120; Itself just can receive a lot of restrictions the position of horizontal power supply line 210 and width, can reach the aforesaid mechanism that couples.For instance; If the position of horizontal power supply line 210 is not good and width is excessive; May hide corresponding different electrical standard regions block power supply supply line 110,120 simultaneously, make standard regions block power supply supply line 110,120 directly to obtain voltage VDD and ground voltage VSS simultaneously by the horizontal power supply line 210 or the vertical power supply line 220 of top; Know that by aforementioned the design that the position of horizontal power supply line 210 and width must be suitable just can not cause above-mentioned problem, so just reduced the elasticity of wiring, and made wires design more complicated.
Therefore, the dealer must develop wiring rule and the layout type that makes new advances, to solve aforesaid problem.
Summary of the invention
Therefore, the wiring rule that one of fundamental purpose of the present invention is to provide a kind of APR instrument with and the integrated circuit related with same layout type, cooking up a kind of new standard regions block power supply supply line, and then solve the problem of conventional art.
A kind of planing method of power supply network; It is applied in the integrated circuit; This integrated circuit comprises the power supply line of at least one standard block (standard cell) and this standard block; The power supply line of this standard block is coupled to this standard block and corresponding to a first direction; The planing method of this power supply network comprises: define a power supply network; This power supply network comprises that this more than first power supply line is positioned at a first metal layer along more than first power supply line (power mesh) of this first direction development and more than second power supply line that develops along a second direction, and this more than second power supply line is positioned at one second metal level; And at one the 3rd metal level definition, the one auxiliary net that connects, this auxiliary net that connects comprises along many auxiliary connecting lines of this second direction development; Wherein this second metal level is positioned on this first metal layer, and the 3rd metal level is positioned under this first metal layer.
A kind of integrated circuit, it comprises: a standard block (standard cell); One standard regions block power supply supply line, this standard regions block power supply supply line are coupled to this standard block and corresponding to a first direction; One power supply network; It comprises more than first power supply line (power mesh) that should first direction and more than second power supply line of a corresponding second direction; This more than first power supply line is formed on a first metal layer, and this more than second power supply line is formed on one second metal level; And the auxiliary net that connects, being formed on one the 3rd metal level, this is auxiliary to connect net and comprises many auxiliary connecting lines that should second direction; Wherein this second metal level is positioned on this first metal layer, and the 3rd metal level is positioned under this first metal layer.
The present invention can cook up preferable wiring method; And it is implemented in the APR instrument; To design preferable circuit layout, with the situation of avoiding via hole/connector to be stopped by lower floor's power supply line, and can be so that the position of horizontal power supply line and width are no longer limited; So not only promoted the elasticity of wires design, also made and to reach by certain rule on the wires design.
Description of drawings
The standard block that Fig. 1 is planned for traditional APR instrument and the stereographic map of standard regions block power supply supply line.
Fig. 2 is standard block, the standard regions block power supply supply line of Fig. 1 and the stereographic map that is positioned at the power supply network on standard block upper strata.
Fig. 3 is the side view of Fig. 2.
Fig. 4 is the power supply network and the auxiliary synoptic diagram that is connected an embodiment of net on standard block of the present invention upper strata.
Fig. 5 is the side view of Fig. 4.
Fig. 6 is an embodiment process flow diagram of the performed planing method of APR instrument of the present invention.
The main element symbol description
100 standard blocks
110,120 standard regions block power supply supply lines
200 power supply networks
210,220 power supply lines
211,221 power leads
212,222 power leads
230,231,232 via holes
The 400 auxiliary nets that connect
410 auxiliary connecting lines
Embodiment
See also Fig. 4 at this, Fig. 4 is the power supply network 200 and the auxiliary synoptic diagram that is connected an embodiment of net 400 on standard block of the present invention 100 upper stratas.In Fig. 4, standard block 100 has identical structure and function with the standard block 100 shown in standard regions block power supply supply line 110,120 and Fig. 1 with standard regions block power supply supply line 110,120, so do not give unnecessary details in this in addition.Note that for for simplicity at this, in Fig. 4, three row's standard blocks 100 only are shown, yet the standard block 100 on the actual wafer can be more.
Note that in the present embodiment that at this standard block 100 upper stratas still have an auxiliary net 400 that connects except having power supply network 200.Identical ground; Power supply network 200 is identical with power supply network 200 shown in Figure 2; Have the power supply line 210 of level and vertical power supply line 220, and the power supply line 210 of level and vertical power supply line 220 couple each other with via hole/connector 231/232 each other.Wherein, indicate electrically that in Fig. 4, via hole/connector 231 is used for carrying out the connection (representing the corresponding VDD of its voltage) of each power lead, and via hole/connector 232 is used for carrying out the connection (representing its voltage current potential VSS accordingly) of each ground wire for clear
As previously mentioned; If standard block 100 upper stratas only have power supply network 200; Horizontal power supply line 210 may stop vertical power supply line 220 and standard regions block power supply supply line 110,120 being electrically connected each other (that is limited vertical power supply line 220 and standard regions block power supply supply line 110,120 each other cross the hole site), and the position of horizontal power supply line 210 can be restricted.Therefore; In the present embodiment; Except power supply network 200, in addition at power supply network 200 with standard regions block power supply supply line 110, the auxiliary connection of construction one deck nets 400 between 120, with accessory power supply supply system 200 and standard regions block power supply supply line 110,120 being electrically connected each other.In the present embodiment, auxiliary to connect net 400 be to be electrically connected each other with horizontal power supply line 210 through via hole/connector 231/232, and belong to the auxiliary connecting line 410 of line development comprising many together with vertical power supply line 220.
Thus, by the auxiliary auxiliary connecting line 410 that connects in the net 400, horizontal power supply line 210 just can successfully be couple to the standard regions block power supply supply line 110/120 of lower floor; As shown in Figure 4; In the present embodiment; Auxiliary connecting line 410 can be connected to standard regions block power supply supply line 110/120 by via hole/connector 231/232 respectively, at this moment since between the standard regions block power supply supply line 110/120 of the auxiliary connecting line 410 that belongs to line development together with vertical power supply line 220 and level development for mutual vertical; And other things do not intercept each other, therefore can successfully couple each other by via hole/connector 231/232; In addition; Auxiliary connecting line 410 also utilizes via hole/connector 231/232 to be interconnected with one another with horizontal power supply line 210; Thus, just can make horizontal power supply line 210 be connected to standard regions block power supply supply line 110/120, so that external power source is imported in the standard block 100.
In addition; Because both can be coupled in horizontal power supply line 210 with vertical power supply line 220; Therefore; Even auxiliary connecting line 410 does not directly couple with vertical power supply line 220, vertical power supply line 220 also can be coupled to the standard regions block power supply supply line 110/120 of below through horizontal electric power connection line 210 and auxiliary connecting line 410.
Perhaps; In another embodiment of the present invention; Via hole/connector 231/232 also capable of using will assist connecting line 410 to couple (not being shown among the figure) each other with vertical power supply line 220; Thus, also can make vertical power supply line 220 directly be coupled to standard regions block power supply supply line 110/120 by auxiliary connecting line 410.
See also Fig. 5 at this, Fig. 5 is the side view of Fig. 4.Can know at Fig. 5 and to see that vertical power supply line 220 can be coupled to the standard regions block power supply supply line 110/120 of below by a plurality of via hole/connectors 231/232 through horizontal electric power connection line 210 and auxiliary connecting line 410.
In addition; Please note at this; Aforesaid structure has the common knowledge the knowledgeable real work of should being not difficult for the present invention, because in advanced process, the metal level that is positioned at standard block 100 upper stratas often all surpasses three layers; Therefore, the dealer can select for use three metal levels to build arbitrarily according to different demands and put aforesaid power supply network 200 and the auxiliary net 400 that is connected.For instance, because standard regions block power supply supply line 110,120 generally is positioned at metal level M1, therefore, the dealer can adopt metal level M4, M5, M6 to carry out aforementioned power source supply system 200 and net 400 build and put with auxiliary the connection.
Note that at this in a preferred embodiment of the present invention, the width of auxiliary connecting line 410 is substantially equal to the width of a connector in order to reduce because of importing the auxiliary spent interconnection resource (routingresource) of net 400 that connects; That is; Such design can discharge the metal level space of lower level; Because the metal level space of lower level is comparatively valuable; Can be used as the usefulness of other wiring connections partly in the circuit, therefore in lower metal level (such as aforesaid metal level M4), build the way of putting the narrower auxiliary connecting line 410 of width and have the benefit that discharges low metal level space.
In addition, because horizontal power supply line 210 all is connected the standard block metal connecting line 110,120 that net 400 is couple to lower floor by assisting with vertical power supply line 220, therefore, the position of horizontal power supply line 210 and width just can not receive aforesaid restriction.For instance; Even the width of horizontal power supply line 210 has hidden the standard regions block power supply supply line 110,120 of below more greatly and simultaneously; But because horizontal power supply line 210 is to be couple to standard block metal connecting line 110,120 by the auxiliary net 400 that connects, therefore such mechanism can not have influence on electrical (that is standard regions block power supply supply line 110,120 also can directly be obtained voltage VDD and earth potential VSS through via hole from the auxiliary connection net 400 of top) of standard regions block power supply supply line 110,120 yet.
According to disclosing of front, the dealer should be implemented into it in APR instrument, to set up a kind of new wiring rule.See also Fig. 6 at this, Fig. 6 is an embodiment process flow diagram of the performed planing method of APR instrument of the present invention.It comprises the following steps:
Step 600: define a standard block 100 with and power supply line 110,120;
Step 610: on the upper strata of this standard block 100; Define a power supply network; This power supply network comprises vertically many power supply line structures 210 of development and many power supply line structures 220 of along continuous straight runs development, and is separately positioned on different metal layers;
Step 620: between the power supply line 110,120 and aforesaid power supply network of standard block 100, other defines an auxiliary net 400 that connects; Should auxiliaryly connect many connecting lines 410 that net 400 comprises the along continuous straight runs development;
Step 630: carry out this and auxiliary connect being electrically connected of net and power supply line, and carry out being electrically connected of this auxiliary connection net and power supply network.In the present embodiment, this Connection Step is in this power supply network and the overlapping region that intersects vertically that should auxiliary be connected net, and the auxiliary overlapping region that intersects vertically that connects net and power supply line, forms with via hole and connector.
At first; Earlier the standard block as traditional mode illustrates, standard regions block power supply supply line (step 610), with power supply network (step 620); Then between power supply network and standard regions block power supply supply line, the disclosed auxiliary net (step 630) that is connected in front is shown again; At last, again with standard regions block power supply supply line, power supply network, couple by via hole and get final product (step 640) with the auxiliary net that is connected.Openly so far, this area has common knowledge the knowledgeable should be understood, so the detailed source code of APR instrument is not just given unnecessary details in this.
Please note at this; Because the present invention must adopt the layer of metal layer to assist the planning that connects net more; Therefore the auxiliary net that connects only plans that in standard block top the planning that connects net is not assisted in complicated huge collection block top, yet; Such practice is merely an embodiment, but not restriction of the present invention.
Compared to conventional art; The present invention can cook up preferable wiring method, and it is implemented in the APR instrument, to design preferable circuit layout; With the situation of avoiding via hole to be stopped by lower floor's power supply line; And can be so that the position of horizontal power supply line and width be no longer limited, so not only promote the elasticity of wires design, also make and can reach by certain rule on the wires design.
Though more than with embodiment the present invention is described, therefore do not limit scope of the present invention, only otherwise break away from main idea of the present invention, the sector person can carry out various distortion or change.
Claims (14)
1. the planing method of a power supply network; It is applied in the integrated circuit; This integrated circuit comprises the power supply line of at least one standard block and this standard block; The power supply line of this standard block is coupled to this standard block and corresponding to a first direction, the planing method of this power supply network comprises:
Define a power supply network; This power supply network comprises along more than first power supply line of this first direction development and more than second power supply line that develops along a second direction; This second direction is perpendicular to this first direction; This more than first power supply line is positioned at a first metal layer, and this more than second power supply line is positioned at one second metal level;
At one the 3rd metal level definition, the one auxiliary net that connects, this auxiliary net that connects comprises along many auxiliary connecting lines of this second direction development;
Wherein this second metal level is positioned on this first metal layer, and the 3rd metal level is positioned under this first metal layer; And
These many auxiliary connecting lines are coupled to power supply line and this power supply network of this standard block.
2. the planing method of power supply network according to claim 1, it also comprises:
Couple this power supply network to one external power source, and couple the power supply line of this power supply network, so that the power supply line of this external power source through this power supply network and this standard block inputs to this standard block to this standard block.
3. the planing method of power supply network according to claim 1, wherein will these many auxiliary connecting line step that is coupled to this power supply network comprise:
Should be coupled to this more than first power supply line by many auxiliary connecting lines.
4. the planing method of power supply network according to claim 1, wherein will these many auxiliary connecting line step that is coupled to this power supply network comprise:
Should be coupled to this more than second power supply line by many auxiliary connecting lines.
5. the planing method of power supply network according to claim 1, wherein will these many auxiliary connecting line step that is coupled to the power supply line of this standard block comprise:
Utilize via hole will these many auxiliary connecting line be coupled to the power supply line of this standard block.
6. the planing method of power supply network according to claim 5, wherein the width of the auxiliary connecting line of each bar equaled hole width substantially in these many auxiliary connecting lines.
7. the planing method of power supply network according to claim 1, it also comprises:
Couple this more than first power supply line to this more than second power supply line.
8. integrated circuit, it comprises:
One standard block;
One standard regions block power supply supply line, this standard regions block power supply supply line are coupled to this standard block and corresponding to a first direction;
One power supply network; It comprises more than first power supply line that should first direction and more than second power supply line of a corresponding second direction; This second direction is perpendicular to this first direction; This more than first power supply line is formed at a first metal layer, and this more than second power supply line is formed at one second metal level;
The one auxiliary net that connects is formed on one the 3rd metal level, and this is auxiliary to connect net and comprise many auxiliary connecting lines that should second direction;
Wherein this second metal level is positioned on this first metal layer, and the 3rd metal level is positioned under this first metal layer; And
Should be coupled to this standard regions block power supply supply line and this power supply network by many auxiliary connecting lines.
9. integrated circuit according to claim 8, wherein this power supply network is coupled to an external power source and this standard regions block power supply supply line, so that this external power source can input to this standard block through this power supply network and this standard regions block power supply supply line.
10. integrated circuit according to claim 8, wherein these many auxiliary connecting lines are coupled to this more than second power supply line.
11. integrated circuit according to claim 8, wherein these many auxiliary connecting lines are coupled to this more than first power supply line.
12. integrated circuit according to claim 8, wherein these many auxiliary connecting lines are to be coupled to this standard regions block power supply supply line by via hole.
13. integrated circuit according to claim 12, wherein the width of the auxiliary connecting line of each bar equaled hole width substantially in these many auxiliary connecting lines.
14. integrated circuit according to claim 8, wherein this more than first power supply line is coupled to this more than second power supply line.
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| CN2008100884276A CN101546345B (en) | 2008-03-26 | 2008-03-26 | Method for planning power supply network and integrated circuit related with same |
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| CN2008100884276A CN101546345B (en) | 2008-03-26 | 2008-03-26 | Method for planning power supply network and integrated circuit related with same |
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