innovus dbGet命令的使用

dbGet是基于一种树状的结构图，如下图所示。head是最原始的parent，然后我们需要寻找的object就藏在这每一个一级一级的分支下。selected和top其实也属于head的一个分支，只不过它们比较常用，所以就单独列出作为一个原始分支。现在各种object一共加起来有64个，我们需要做的就是找准路线，一击必中，把“指针”找出来。

dbGet的用法就像Tcl一样，是很灵活多变的，体现在它这个命令本身具有很多option
dbGet
[-p num ]
[-u]
[-regexp]
[-d]
{ obj | objList | head | top | selected}
[. objType ]…[. attrName | .? | .?? |.?h]
[ pattern ]
[expression]
[-v]
[-e]
[-i]

-p是我们经常用到的option。p指point，有时我们使用dbGet筛选得到我们所想要的结果。但更多时候，这些结果会被用来做另一个层级的dbGet指令。这时候就要用到-p，来返回指针。

如果我们想要知道所有在M3上的insts pin的名字：

innovus 59> dbGet [dbGet -p2 top.insts.instTerms.layer.name M3].name

CHIP_TOP/buf_input_datax2x/AREPEATER_datax2x/Z ……

给出几个例子：

• 列出设计中所有place/unplace的instance

<pre class="code-snippet__js" data-lang="css">```
<span class="code-snippet_outer"><span class="code-snippet__selector-tag">dbGet</span> <span class="code-snippet__selector-attr">[dbGet -p top.insts.pStatus unplaced]</span><span class="code-snippet__selector-class">.name</span></span>
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dbGet [dbGet -p top.insts.pStatus placed].name

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• List all fixed instances in the design

<pre class="code-snippet__js" data-lang="css">```
<span class="code-snippet_outer"><span class="code-snippet__selector-tag">dbGet</span> <span class="code-snippet__selector-attr">[dbGet -p top.insts.pStatus fixed]</span><span class="code-snippet__selector-class">.name</span></span>
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- List the metal layers on which the I/O pins of the block reside

- 
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```
dbGet top.terms.pins.allShapes.layer.name
```
```

- 获得所有 spare instances

- 

```
```
dbGet [dbGet -p top.insts.isSpareGate 1].name
```
```

- get 特定instance的pg pin

- 

```
```
dbGet [dbGet top.insts.name $instName -p ].pgInstTerms.name
```
```

**Cadence提供了更为详细的命令，参考如下：**You can use the following single-line dbGet scripts to explore various aspects of your design:

- **List all unplaced instances in the design**

- 

```
```
dbGet [dbGet -p top.insts.pStatus unplaced].name
```
```

- **List all placed instances in the design**

- 

```
```
dbGet [dbGet -p top.insts.pStatus placed].name
```
```

- **List all fixed instances in the design**

- 

```
```
dbGet [dbGet -p top.insts.pStatus fixed].name
```
```

- **List the metal layers on which the I/O pins of the block reside**

- 

```
```
dbGet top.terms.pins.allShapes.layer.name
```
```

- **List the non default rules (NDR) in the design**

- 

```
```
dbGet head.rules.name
```
```

- **List the NDRs applied on a specified net**

- 

```
```
dbGet [dbGet -p top.nets.name netName].rule.name
```
```

- **List net names with specific max or min voltage**

- 
- 

```
```
 dbGet [dbGet top.nets.maxVoltage value –p].name
``````
 dbGet [dbGet top.nets.minVoltage value –p].name
```
```

- **Get the placement status of an instance**

- 

```
```
dbGet [dbGetInstByName instName].pStatus
```
```

- **To avoid splitting of a specified multibit flop, during multibit Optimization**

- 

```
```
dbSet [dbGetInstByName ].dontSplitMultibit 1
```
```

- **To avoid merging of a specified multibit flop, during multibit Optimization**

- 

```
```
dbSet [dbGetInstByName ].dontMergeMultibit 1
```
```

- **Get the coordinates of a rectangular routing blockage**

- 

```
```
dbGet top.fplan.rBlkgs.shapes.rect
```
```

- **Get the coordinates of a rectilinear routing blockage**

- 

```
```
dbGet top.fplan.rBlkgs.shapes.poly
```
```

- **List all cell types used in the design**

- 

```
```
dbGet -u top.insts.cell.name
```
```

**Note:** The "-u" parameter filters out the duplicate objects.

- **Get the size of block placement halos**

- 
- 
- 
- 

```
```
 dbGet [dbGet -p2 top.insts.cell.subClass block*].pHaloTop
``````
 dbGet [dbGet -p2 top.insts.cell.subClass block*].pHaloBot
``````
 dbGet [dbGet -p2 top.insts.cell.subClass block*].pHaloLeft
``````
 dbGet [dbGet -p2 top.insts.cell.subClass block*].pHaloRight
```
```

- **Get the size and top/bottom layers of block routing halos**

- 
- 
- 

```
```
 dbGet [dbGet -p2 top.insts.cell.subClass block*].rHaloSideSize
``````
 dbGet [dbGet -p2 top.insts.cell.subClass block*].rHaloBotLayer.name
``````
 dbGet [dbGet -p2 top.insts.cell.subClass block*].rHaloTopLayer.name
```
```

- **Ensure all your tiehi/tielo connections have tie cells (and are not connected to a rail instead)**

- 
- 
- 
- 
- 

```
```
dbGet top.insts.instTerms.isTieHi 1
``````
dbGet top.insts.instTerms.isTieLo 1
``````
The previous commands should return "0x0" if all connections have tie cells. If "1s" are returned, use the following commands to find the terms that still need a tie cell:
``````
dbGet [dbGet -p top.insts.instTerms.isTieHi 1].name
``````
dbGet [dbGet -p top.insts.instTerms.isTieLo 1].name
```
```

- **Get all instTerm names that are tied to tieLo cells**

- 

```
```
dbGet [dbGet -p [dbGet -p2 top.insts.cell.subClass coreTieLo].instTerms.net.allTerms.isInput 1].name
```
```

- **Change the routing status of a net (for example, from FIXED to ROUTED)**

- 

```
```
dbSet [dbGet -p top.nets.name netName].wires.status route
```
```

- **Get the status of the design**

- 
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- 

```
```
 dbGet top.statusIoPlaced
``````
 dbGet top.statusPlaced
``````
 dbGet top.statusClockSynthesized
``````
 dbGet top.statusRouted
``````
 dbGet top.statusRCExtracted
``````
 dbGet top.statusPowerAnalyzed 
```
```

- **List the layers used in a net**

- 

```
```
dbGet [dbGet -p top.nets.name netName].wires.layer.name
```
```

- **Selecting Shield Nets of a net**

- 

```
```
 dbSelectObj [dbget [dbget -p [dbGet -p top.nets.name $net].shieldNets.name GND].sWires.shieldNet.name $net -p2]
```
```

NOTE: $net is the net for which you want to select the shield.

- **Find all instances of a certain cell type**

- 

```
```
dbGet [dbGet -p2 top.insts.cell.name cellName].name
```
```

- **Determine the size of a cell in the library, but not necessarily in the current design**

- 

```
```
dbGet [dbGetCellByName cellName].size
```
```

- **List the nets marked in the db as clock net**

- 

```
```
dbGet [dbGet -p top.nets.isClock 1].name
```
```

**Note:** Before running the previous command, build a timing graph using the timeDesign command.

- **Set all instances with a particular pattern in the name to fixed status**

- 

```
```
dbSet [dbGet –p top.insts.name *clk*].pStatus fixed
```
```

- **Get top and bottom routing layers for a route\_type**

- 
- 

```
```
 dbGet [dbGet -p head.routeTypes.name routeTypeName].topPreferredLayer.num
``````
 dbGet [dbGet -p head.routeTypes.name routeTypeName].bottomPreferredLayer.num
```
```

- **Get database units**

- 

```
```
dbGet head.dbUnits
```
```

- **Get the manufacturing grid**

- 

```
```
dbGet head.mfgGrid
```
```

- **Get physical only cells such as filler cell, end cap cell, and so on**

- 

```
```
dbGet [dbGet -p top.insts.isPhysOnly 1].name
```
```

- **Report Dont Touch instances:**

- 

```
```
dbGet [dbGet -p top.insts.dontTouch true].name
```
```

- **Report Dont Use cells in the database**

- 

```
```
dbGet [dbGet -p head.libCells.dontUse 1].name
```
```

- **Report JTag elements:**

- 

```
```
dbGet [dbGet -p top.insts.isJtagElem 1].name
```
```

- **Report spare instances:**

- 

```
```
dbGet [dbGet -p top.insts.isSpareGate 1].name
```
```

- **Filter all PG pins with direction bidi of a specific instance**

- 

```
```
dbGet [dbGet -p [dbGet -p top.insts.name instName].pgCellTerms.inOutDir bidi].name
```
```

- **Get PG pins connections of a specific instance**

- 
- 
- 
- 
- 
- 

```
```
proc getInstPGConnect {c} {
``````
    set inst [dbget -p top.insts.name $c]
``````
    puts "PG connection of instance $c:"
``````
  foreach PGT [dbget $inst.pgCellTerms.name] { 
``````
    puts "\tPin : $PGT --> Net: [dbget [dbPGTermNet [dbGetPGTermByName $inst $PGT]].name]" }
``````
 }
```
```

- **Get class and subClass of a cell**

- 
- 

```
```
 dbGet [dbGetCellByName cellName].baseClass
``````
 dbGet [dbGetCellByName cellName].subClass
```
```

- **Selecting all Macros/Blocks of a particular module (or Hierarchical instance)**

- 

```
```
selectInst [dbGet [dbGet top.hInst.allTreeInsts.cell.baseClass block -p2].name specify_module_name> ]
```
```

- **Get all the sequential cells of a particular module**

- 
- 

```
```
 selectModule module_name>
``````
 dbGet [dbGet selected.insts.cell.isSequential 1 -p2].name 
```
```

- **Get the instname / cellname of the driver driving a specific net**

- 
- 
- 

```
```
 set netName netName
``````
 set inst [dbGet [dbGet -p [dbGet -p top.nets.name $netName].allTerms.isOutput 1].inst]
``````
 Puts "Net: $netName, driving inst name: [dbGet $inst.name], driving cell name: [dbGet $inst.cell.name]"
```
```

- **List all layers for the pin of a cell**

- 

```
```
dbGet [dbGet -p selected.cell.terms.name pinName].pins.allShapes.layer.extName
```
```

- **Report points of the polygon that forms the die area**

- 

```
```
dbShape -output polygon [dbGet top.fPlan.boxes]
```
```

- **Get Verilog module ports**

- 

```
```
dbGet [ dbGet -p1 top.hInst.allTreeInsts.name $moduleInstName].hInstTerms.hTerm.name
```
```

- **To query top level term pin coordinates and layer number**

- 
- 

```
```
 lindex [dbGet [dbGet top.hinst.hinstTerms.term.name  - p].pins.allShapes.shapes.rect] 0
``````
 dbGet [dbGet top.hinst.hinstTerms.term.name   -p].pins.allShapes.layer.num
```
```

- **Query max\_cap for a list of cells**

- 
- 

```
```
 cellPtrList [dbGet -p head.allCells.n ame BUF*]
``````
 foreach cellPtr $cellPtrList {puts "[dbGet $cellPtr.name] [dbFTermMaxCap [dbGet -p $cellPtr.terms.name termName] 1]"}
```
```

- **Find all instances with a specify property name "myProp" (string property type) and value "xyzzy"**

- 
- 

```
```
set inst_ptrs [dbGet -p top.insts.props {.name == "myProp" && .value == "xyzzy"]
``````
Puts "Instances with property myProp and value xyzzy: [dbGet $inst_ptrs.name]"
```
```

- **Find non-clock ports in a design**

- 

```
```
dbGet [dbGet -p [dbGet -p2 top.terms.net.isClock 0].isInput 1].name
```
```

- **To get information on all tech sites in the design**

- 
- 
- 

```
```
 dbGet head.sites.name
``````
 dbGet head.sites.size
``````
 dbIsTechSiteVDDOnBottom [dbGet head.sites.name  -p]
```
```

- **Identify and report ‘physical only’ types of cells (well tap, tie hi/lo, filler, endcap/decap)**

You can query the subclass for a cell to check whether it is welltap, tiehigh, tielow or end cap:

- 
- 
- 
- 
- 
- 
- 
- 
- 
- 
- 

```
```
dbGet [dbGet -p head.libCells.subClass ].name 
``````
For example, to get names of well tap cells (specified as ‘CLASS CORE WELLTAP ‘ in LEF), you can use the following command:
``````
dbGet [dbGet -p head.libCells.subClass coreWellTap].name
``````
Similarly, to get names of tie high / tie low cells (specified as ‘CLASS CORE TIEHIGH’ or ‘CLASS CORE TIELOW’ in LEF), use the following command:
``````
dbGet [dbGet -p head.libCells.subClass coreTieHigh].name
``````
OR
``````
dbGet [dbGet -p head.libCells.subClass coreTieLow].name
``````
To report endcap cells (specified as ‘CLASS ENDCAP’ in LEF), use the following command:
``````
dbGet [dbGet -p head.libCells.subclass coreEndCap*].name
``````
Similarly, to query filler cells with ‘CLASS CORE SPACER’ in the LEF syntax, you can use the following command (similar to other physical-only cells): 
``````
dbGet [dbGet -p head.libCells.subClass coreSpacer].name
```
```

- **Print all module names in the design**

- 
- 
- 

```
```
foreach module_name [dbGet top.hInst.treeHInsts.cell.name] {
``````
          Puts "$module_name"
``````
   }
```
```

This will not include the top module name. To get the top module name, run the following command:

- 

```
```
dbGet top.name
```
```

- **Get all leaf cells used in the design**

- 
- 
- 

```
```
foreach leaf_name [dbGet -u top.insts.cell.name] {
``````
             Puts "$leaf_name"
``````
 }
```
```

- **Apply set\_dont\_touch on selected instances**

Select the instances on which to apply set\_dont\_touch. For example, select all level-shifter instances with the "LS" prefix:

- 
- 
- 
- 
- 

```
```
dbGet top.insts.name LS*
``````
Then, run the following command:
``````
foreach term [dbGet selected.instTerms.net.term –e] {
``````
 set_dont_touch [dbGet $term.net.name] true
``````
 }
```
```

- **Skip routes hierarchical hard macro nets**

- 
- 
- 
- 
- 
- 

```
```
proc skiproutesOnHmsNets {hmInstPattern} {
``````
    deselectAll
``````
    selectInst *$hmInstPattern*
``````
    dbset selected.hinst.hnets.net.skipRouting 1
``````
    deselectAll
``````
 }
```
```

- **Removing nets over the Macros along with pitches and vias**

Incase some nets are routed over the Hard Macros, you can remove such nets along with pitches and vias using following command:

- 
- 
- 
- 
- 
- 

```
```
foreach c [dbGet [dbGet -p2 top.insts.cell.baseClass block].name] {             
``````
  set j [dbGet -p top.insts.name $c ]                                          
``````
  dbSelectObj  [dbQuery -area  [dbGet $j.box ] -objType regular]                                
``````
  puts "Deleting object at [dbGet $j.box ] within Block [dbget $j.name]"
``````
  editDelete -selected  -type Signal  -use SIGNAL                          
``````
 }
```
```

- **Get the number of vias that are not power in a routed design**

- 

```
```
llength [dbGet [dbGet -p top.nets.isPwrOrGnd 0].vias]
```
```

- **Break the DFM flow if metal fills are not added to design using run\_pvs\_metal\_fill.**

Include following set of command to break the script if metal fill is not added to design

puts "Checking if run\_pvs\_metal\_fill successfully inserted metal fill shapes..."

- 
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- 

```
```
 if {[dbGet [dbGet -p  top.nets.name _FILLS_RESERVED].sWires.shape fillwire] >= 0} {
``````
           puts "db has metal fill - continuing..."
``````
           set has_fill 1
``````
     } else {
``````
          puts "db has no metal fill - stopping dfm run..."
``````
          set has_fill 0
``````
        }
``````
if {$has_fill 1} {
``````
   break
``````
  } else {   ..  
```
```

- **Report instance pin shape mask**

You can use TCL procedure below to report the mask(color) of the instance pin:

- 
- 
- 
- 
- 
- 
- 
- 

```
```
proc pinColor {instPin layer} {
``````
   if {![regexp $layer [dbGet [dbGet top.insts.instTerms.name $instPin -p].cellTerm.pins.allShapes.layer.name]]} {
``````
       Puts "$instPin doesn't have pin shape on $layer"
``````
   } else {
``````
   dbGet [dbGet [dbGet top.insts.instTerms.name $instPin -p].cellTerm.pins.allShapes.layer.name $layer -p2].shapes.mask
``````
   }
``````
 }
``````
pinColor Ainst/o VIA1
```
```

- **Report latency of all memories in the design**

Following script prints the latency of all memories with cell name \*RAM\* and clock pin name \*CLK. You can change \*RAM\* with cell name of the desired memories, or as per your design.

- 
- 
- 
- 

```
```
set mem_pin [dbget [dbget top.insts.cell.name *RAM* -p2].instTerms.name *CLK]
``````
 foreach i $mem_pin {
``````
         puts "$i [get_property [get_pins $i] actual_latency_late_rise_max]"
``````
 }
```
```

- **Report all flop instances with reset pin connected to the supply**

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- 

```
```
#  dentify all flops with reset tied directly to the vss rail
``````
 #  report total count, and each instname and cellname to an 
``````
 #  output file named 'flop_with_tied_rst.rpt'
``````
proc findRstPinsTiedToRail{ $VSS_name $RSTport } {
``````
  # don't echo dbGet, etc. to screen/log:
``````
   setPreference CmdLogMode 1
``````
  # output file name:
``````
   set ofile "flop_with_tied_rst.rpt"
``````
   set ecofp [ open $ofile w ]
``````
  set cnt [llength [dbGet [dbGet [dbGet top.nets.name $VSS_name -p].instTerms.cellTerm.name $RSTport -p2 ].inst.name ]]
``````
   set insts  [dbGet [dbGet [dbGet top.nets.name $VSS_name -p].instTerms.cellTerm.name $RSTport -p2 ].inst ]
``````
   set cnt2 [llength $insts]
``````
  puts $ecofp "Total: $cnt $cnt2"
``````
   #foreach inst_ptr [dbGet [dbGet [dbGet top.nets.name $VSS_name -p].instTerms.cellTerm.name $RSTport -p2 ].inst ] 
``````
   foreach inst_ptr $insts {
``````
      set inst_name [dbGet $inst_ptr.name]
``````
      set cell_ptr [dbInstCell $inst_ptr]
``````
      set cell_name [dbGet $cell_ptr.name]
``````
      set rst_port [dbGet $inst_ptr.instTerms.cellTerm.name $RSTport -p2]
``````
      set net [dbGet $rst_port.net.name]
``````
      puts $ecofp "$inst_name $cell_name "
``````
   }
``````
  close $ecofp
``````
 }
```
```

To get the status of a design:

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- 
- 
- 
- 

```
```
encounter> dbGet top.?? status* // reports the list of status at particular stage
``````
 statusClockSynthesized: 0
``````
 statusGRouted: 0
``````
 statusIoPlaced: 1
``````
 statusPlaced: 1
``````
 statusPowerAnalyzed: 0
``````
 statusRCExtracted: 0
``````
 statusRouted: 1
``````
 statusScanOpted: 0
``````
Example to check a particular value:
``````
encounter> dbGet top.statusPlaced
``````
 1 // it shows design is placed
```
```

**Note:** The top.statusClockSynthesized flag is only for FE-CTS \[setCTSMode -engine ck\] not for CCOpt.

- **Create SDP(structured data path) groups of clock gates and flops:**

The following script will find the clock gates and the flops connected to the clk pin in the design and group them together using createSdpGroup

**Script:**

- 
- 
- 
- 
- 
- 
- 

```
```
set clock_gates [dbget [dbget top.insts.cell.name *cgc* -p2].instTerms.name *clk -p2]
``````
 foreach i $clock_gates {
``````
 ## find clock net of the clock gate
``````
   set clock_net [dbget $i.instTerms.name *clk -p]
``````
   set sdp_group_name [string map {/ _} [join [dbget $i.name] ""]]
``````
   set flops [dbget [dbget $clock_net.net.instTerms.isInput 1 -p].inst.name ]
``````
   createSdpGroup -name $sdp_group_name -alignByPinName clk -inst $flops
```
```

}

**Note:** Please use cell name and clock pins name(cgc and clk used for example) as per the library specifications.

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