ADDER X-SC Bedienungsanleitung PDF herunterladen (Seite 50)

50 CHAPTER 1. INTRODUCTION TO THE ALLIANCE TOOLS

Table 1.20: Options Available for the NERO Tool.

Option Description

-h, –help Prints help.

-v, –verbose

Verbose mode.

-V, –very-verbose Unbearably verbose.

-c, –core-dump Allows core dump in case of a crash.

-2, -3, -4, -5, -6

Sets the numbers of layers used for routing. T he default for small designs is 2

and 4 for big ones.

-L, –local

Turns oﬀ the global routing stage, whatever the size of the design is. Be warned

that this will enormously slow down the routing process.

-G, –global Turns on the global routing regardless of the size of the design.

-p ﬁle, –place ﬁle Speciﬁes a name for the placement ﬁle diﬀerent from the netlist name.

1.21 OCP

The OCP tool is used for placement in Alliance. It uses as input a netlist of standard cells. The netlist format

can be structural VHDL, EDIF or Alliance internal format. This format is given by the MBK IN LO variable.

Optionally, we can also give a ﬁle indicating the placement of connectors (ioc type ﬁle). If nonstandard blocks

are used in the design, one has to provide the placement for those blocks. The output of the placer will be a

physical layout ﬁle with placed cells and connectors. The format of the output is deﬁned by the MBK OUT PH

environment variable . We use OCP with the following command.

% ocp [options] netlist outputname

The options available in OCP are shown in Table 1.21. Let’s use OCP to place the LOON optimized multiplexer

Table 1.21: Options Available for the OCP Tool.

Option Description

-partial NAME

Deﬁnes the user deﬁned placement ﬁle. It must have an extension equal to that

deﬁned by MBK IN PH.

-c

Will make OCP place the connectors randomly on each side of the abutment box.

-ring

Makes OCP to place the connectors for the ring pad placement tool. The placement

is random but only on the north and south side unless the -ioc option is given, in

which case the constraints given in the NAME.ioc ﬁle will be respected, but w ith

layers suitable for ring. This option is temporary and is provided for the ring pad

placement tool.

-ioc NAME

The placement of connectors will be done accordingly to what is speciﬁed in the

NAME.io c ﬁle.

-margin m

Sets the amount of free area added in percentage of the cells area. The resulting

area will be equal to CELL AREA * (1 + m). By default, the margin value is 0.2

(20%)

-eqmargin

Will distribute equitably the margin between cells. By default the largest numb er

of 2-pitch tie cells is inserted to have the best well and bulk polarity.

-rows NR

Forces the design to be placed in NR rows. This option will not be used if a deﬁned

placement ﬁle is used.

-v

Verbose mode.

-gnuplot Generates gnuplot ﬁles for editing statistics.

design (mux ool.vst), but this time will make OCP also place the connectors of the design. Placing the connectors

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