Provided by: alliance_5.0-20120515-6_amd64 
NAME
sxlib - a portable CMOS Standard Cell Library
DESCRIPTION
sxlib library contains standard cells that have been developed at UPMC-ASIM/LIP6. This
manual gives the list of available cells, with their behavior, width, maximum delay and
input fan-in. This manual gives also few thumb rules to help the user to well use the
cells. The given delay are the maximum (that means worst case for a generic .35 micron
process). More precise delay can be found in ALLIANCE VHDL behavior files (.vbe file).
Cell-name is built that way <behavior>_<output drive> (see explanations below).
Four files are attached to each cell:-
- ALLIANCE Layout ............... cell-name.ap
- ALLIANCE Transistor net-list .. cell-name.al
- ALLIANCE VHDL behavior ........ cell-name.vbe
- Compiled HILO behavior ........ 0000000xx.dat
And few files more:-
- CATAL ......................... ALLIANCE catalog file
- sxlib.cct ..................... Cell definition for HILO CAD tools
- CIRCUIT.idx ................... HILO catalog file
- sxlib.lib ..................... Cell definition for Synopsys CAD tools
- sxlib.db ...................... Compiled cell definition for Synopsys
- sxlib.sdb ..................... Icon definition for Synopys
PHYSICAL OUTLINE
sxlib uses the symbolic layout promoted by Alliance in order to provide process
independence. All dimensions are in lambda units. The mapping to a specific process CIF or
GDS2 layout must be performed by the s2r tool (symbolic to real), which uses a value for
the lambda (e.g. 1 lambda=0.3um).
_________________
50 | VDD |
45 |_________________| x : place of virtual connector.
40 | x |
35 | x x | they are named : name_<y>
30 | x x |
25 | x x | for example : i0_20
20 | x | i0_25
15 | x | i0_30
10 |_________________|
5 | VSS |
0 |_________________|
0 5 10 15 20 25 30
All cells are 50 lambdas high and N times 5 lambdas wide, where N is the number of
pitches. That is the only physical information given in the cell list below. Power
supplies are in horizontal ALU1 and are 6 lambdas wide. Connectors are inside the cells,
placed on a 5x5 grid. Half layout design rules are a warranty for any layer on any face,
except for the power supply and NWELL. Cells can be abutted in all directions whenever
the supply is well connected and connectors are always placed on the 5x5 grid.
DELAY MODEL
Cells have been extracted and simulated by using a generic 0.35um process in order to give
realistic values for the delays and capacitances. We chose to give only the worst delay
for each output signal, though it is not very realistic (since delay depends on each
input, an input can be easily up to twice faster than another). However, we just wanted to
give an idea of the relative delay.
Furthermore, we added 0.6ns to each output delay in order to take into account the delay
due to the signal commutation. We have supposed the output drives the maximum capacitance.
This capacitance have been computed as follow. We considered that a good slope signal for
this process was 0.8ns. Then we searched for the capacitance required to obtain the same
input and output slope (0.8ns) for the smaller inverter (inv_x1). That was 125fF. We
simulated the same inverter without output capacitance. The delay difference was about
0.6ns. This result is not exactly the same for all cells, but 0.6ns is a good
approximation.
The given delay is then a worst case (70degree, 2.7Volt, slow process, worst input), an
idea of the typical delay can be obtain by dividing worst delay by 1.5, and best delay by
dividing by 2. More detailed data can be found in GENERIC data included in the VHDL files
(.vbe). Examples can be found at the end of this manual.
At last, to get a very better idea about the real delay without simulating the spice
transistor netlist, it is required to use the TAS (1) tool, which is a timing static
analyzer able to give the longer and the shorter path for a given process.
OUTPUT DRIVE
The output drive of a cell gives an information on the faculty for the cell to drive a big
capacitance. This faculty depends on the rising and falling output resistance. The smaller
the resistance, the bigger can be the capacitance. Minimum drive is x1. This corresponds
to the smallest available inverter (inv_x1). x2 means the cell is equivalent (from the
driving point of view) at two smaller inverters in parallel, and so on.
The maximum output drive is x8. It is limited because of the maximum output slope and the
maximum authorized instantaneous current. If it was bigger the output slope could be very
tight and the current too big.
With the 0.35um process, an x1 is able to drive about 125fF, x2 -> 250fF, x4 -> 500fF,x8
-> 1000fF. This is just an indication since if a cell is overloaded, the only consequence
is to increase the propagation time. On the other hand, it is not very good to under-load
a cell because this leads to a signal overshoot. Actually, for big gate, such as
noa3ao322_x1, x1 means maximal driving strength reachable with a single logic layer, that
can be much less than an inv_x1. That is why is the cell list below contains more precise
drive strengh. As you can see noa3ao322_x1 as a output drive strengh of 0.6, that means
0.6 time an inverter, so say it can drive about 0.6*125fF=75fF.
With the 0.35um process, a 1 lambda interconnect wire is about 0.15fF, an average cell
fan-in is 10fF. Then, if it needs about 50 lambdas to connect 2 cells, an x1 cell is able
to drive about 7 cells (125/(10+50*.15)=7). With 100 lambdas, 5 cells, with 750 lambdas
only 2 cells. Note that 50 lambdas means cells are very close one from each other, nearly
abutted, 100 lambdas is an average value.
All this are indications. Only a timing analysis on the extracted transistor net-list
from layout can tell if a cell is well used or not (see tas(1) for informations about
static timing analysis).
BEHAVIOR
For most of cells, the user can deduce the cell behavior just by reading its name. That
is very intuitive for inverter and more complex for and/or cells. For the last, the name
gives the and/or tree structure. The input order for the VHDL interface component is
always the alphabetic order.
inv : inversor buffer
buf : buffer
[n]ts : [not] tree-state
[n]xr<i> : [not] xor <i> inputs
[n]mx<i> : [not] multiplexor <i> inputs with coded command
[n][sd]ff<i> : [not] [static|dynamic] flip-flop <i> inputs
[n]oa... : [not] and/or function (see below)
and_or cell (YACC (1) grammar):-
NAME : n OA_CELL -> not OA_CELL
| OA_CELL -> OA_CELL
OA_CELL : OPERATOR INPUTS -> function with INPUTS inputs
| OPERATOR OA_CELLS INPUTS -> function with INPUTS inputs
where some inputs are OA_CELL
OPERATOR : a -> and
| o -> or
| n -> not
OA_CELLS : OA_CELLS OA_CELL -> list of OA_CELL
| OA_CELL -> last OA_CELL of the list
INPUTS : integer -> number of inputs
The input names are implicit and formed that way i<number>.
They are attributed in order beginning by i0.
nx where x is a number means there are x inverters in parallel. For
example an23 is an and with 3 inputs of which two are inverted, that
is and( not(i0), not(i1), i2).
Examples:- (some are not in sxlib)
na2 : not( and(i0,i1))
on12 : or( not(i0), i1)
noa2a22 : not( or( and(i0,i1), and(i2,i3)))
noa23 : not( or( and(i0,i1), i3))
noao22a34 : not( or( and( or(i0,i1), i2), and(i3,i4,i5), i6, i7))
Note that xr2 could not be expressed with an and/or formulea even if
xr2 = or( and( not(i0), i1), and( not(i1), i0)) = oan12an122
but the input names are not well distributed.
CELL LIST
All available cells are listed below. The first column is the pitch width. The pitch
value is 5 lambdas. The height is 50. Area is then <number>*5*50.
The second column is the output drive strenght compared with the inv_x1 output drive
strenght (see explanation above in section OUTPUT DRIVE).
The following column is the delay in nano-seconds. Remember this delay corresponds to the
slower input+0.6ns (see explanation above in section DELAY MODEL).
The last column gives the function behavior with input capacitance. / means not, + means
or, . means and, ^ means xor. Each input is followed by fan-in capacitance in fF, (e.g.
i0<11> means i0 pin capacitance is 11fF).
For some cells, such as fulladder, it was not possible to internally connect all inputs.
That means there are several inputs that must be externally connected. In the following
list, these inputs are followed by a star (*) character in the equation.
For example, fulladder equation is sout <= (a* . b* . cin*). a* replaces a0, a1, a2, a3
that must be explicitly connected by the user. Note also few cells have more than one
output. In that case there are several lines in the list, one by output.
=================================================================
WIDTH NAME DRIVE DELAY BEHAVIOR with cin
-------------------------------------------------------- INVERSOR
3 inv_x1 1.0 0.7 nq <= /i<8>
3 inv_x2 1.6 0.7 nq <= /i<12>
4 inv_x4 3.6 0.7 nq <= /i<26>
7 inv_x8 8.4 0.7 nq <= /i<54>
---------------------------------------------------------- BUFFER
4 buf_x2 2.1 1.0 q <= i<6>
5 buf_x4 4.3 1.0 q <= i<9>
8 buf_x8 8.4 1.0 q <= i<15>
------------------------------------------------------ THREE STATE
6 nts_x1 1.2 0.8 IF (cmd<14>) nq <= /i<14>
8 nts_x2 2.4 0.9 IF (cmd<18>) nq <= /i<28>
10 ts_x4 4.3 1.1 IF (cmd<19>) q <= i<8>
13 ts_x8 8.4 1.2 IF (cmd<19>) q <= i<8>
-------------------------------------------------------------- AND
4 na2_x1 1.0 0.9 nq <= /(i0<11>.i1<11>)
7 na2_x4 4.3 1.2 nq <= /(i0<10>.i1<10>)
5 na3_x1 0.9 1.0 nq <= /(i0<11>.i1<11>.i2<11>)
8 na3_x4 4.3 1.3 nq <= /(i0<10>.i1<10>.i2<10>)
6 na4_x1 0.7 1.0 nq <= /(i0<10>.i1<11>.i2<11>.i3<11>)
10 na4_x4 4.3 1.4 nq <= /(i0<10>.i1<11>.i2<11>.i3<11>)
5 a2_x2 2.1 1.0 q <= (i0<9>.i1<11>)
6 a2_x4 4.3 1.1 q <= (i0<9>.i1<11>)
6 a3_x2 2.1 1.1 q <= (i0<10>.i1<10>.i2<10>)
7 a3_x4 4.3 1.2 q <= (i0<10>.i1<10>.i2<10>)
7 a4_x2 2.1 1.2 q <= (i0<10>.i1<10>.i2<10>.i3<10>)
8 a4_x4 4.3 1.3 q <= (i0<10>.i1<10>.i2<10>.i3<10>)
5 an12_x1 1.0 1.0 q <= (/i0<12>).i1<9>
8 an12_x4 4.3 1.1 q <= (/i0<9>).i1<11>
--------------------------------------------------------------- OR
4 no2_x1 1.0 0.9 nq <= /(i0<12>+i1<12>)
8 no2_x4 4.3 1.2 nq <= /(i0<12>+i1<11>)
5 no3_x1 0.8 1.0 nq <= /(i0<12>+i1<12>+i2<12>)
8 no3_x4 4.3 1.3 nq <= /(i0<12>+i1<12>+i2<11>)
6 no4_x1 0.6 1.1 nq <= /(i0<12>+i1<12>+i2<12>+i3<12>)
10 no4_x4 4.3 1.4 nq <= /(i0<12>+i1<12>+i2<12>+i3<12>)
5 o2_x2 2.1 1.0 q <= (i0<10>+i1<10>)
6 o2_x4 4.3 1.1 q <= (i0<10>+i1<10>)
6 o3_x2 2.1 1.1 q <= (i0<10>+i1<10>+i2<9>)
10 o3_x4 4.3 1.2 q <= (i0<10>+i1<10>+i2<9>)
7 o4_x2 2.1 1.2 q <= (i0<10>+i1<10>+i2<10>+i3<9>)
8 o4_x4 4.3 1.3 q <= (i0<12>+i1<12>+i2<12>+i3<12>)
5 on12_x1 1.0 0.9 q <= (/i0<11>)+i1<9>
8 on12_x4 4.3 1.1 q <= (/i0<9>)+i1<10>
--------------------------------------------------------- AND/OR 3
6 nao22_x1 1.2 0.9 nq <= /((i0<14>+i1<14>).i2<14>)
10 nao22_x4 4.3 1.3 nq <= /((i0<8> +i1<8>) .i2<9>)
6 noa22_x1 1.2 0.9 nq <= /((i0<14>.i1<14>)+i2<14>)
10 noa22_x4 4.3 1.3 nq <= /((i0<8> .i1<8>) +i2<9>)
6 ao22_x2 2.1 1.2 q <= ((i0<8>+i1<8>).i2<9>)
8 ao22_x4 4.3 1.3 q <= ((i0<8>+i1<8>).i2<9>)
6 oa22_x2 2.1 1.2 q <= ((i0<8>.i1<8>)+i2<9>)
8 oa22_x4 4.3 1.3 q <= ((i0<8>.i1<8>)+i2<9>)
--------------------------------------------------------- AND/OR 4
7 nao2o22_x1 1.2 1.0 nq <= /((i0<14>+i1<14>).(i2<14>+i3<14>))
11 nao2o22_x4 4.3 1.4 nq <= /((i0<8> +i1<8>) .(i2<8> +i3<8>))
7 noa2a22_x1 1.2 1.0 nq <= /((i0<14>.i1<14>)+(i2<14>.i3<14>))
11 noa2a22_x4 4.3 1.4 nq <= /((i0<8> .i1<8>) +(i2<8> .i3<8>))
9 ao2o22_x2 2.1 1.2 q <= ((i0<8>+i1<8>).(i2<8>+i3<8>))
10 ao2o22_x4 4.3 1.3 q <= ((i0<8>+i1<8>).(i2<8>+i3<8>))
9 oa2a22_x2 2.1 1.2 q <= ((i0<8>.i1<8>)+(i2<8>.i3<8>))
10 oa2a22_x4 4.3 1.4 q <= ((i0<8>.i1<8>)+(i2<8>.i3<8>))
--------------------------------------------------------- AND/OR 5
7 noa2ao222_x1 0.7 1.1 nq <= /((i0<11>.i1<11>)+((i2<13>+i3<13>).i4<13>))
11 noa2ao222_x4 4.3 1.4 nq <= /((i0<11>.i1<11>)+((i2<11>+i3<11>).i4<11>))
10 oa2ao222_x2 2.1 1.2 q <= ((i0<8> .i1<8>) +((i2<8> +i3<8>) .i4<8>))
11 oa2ao222_x4 4.3 1.3 q <= ((i0<8> .i1<8>) +((i2<8> +i3<8>) .i4<8>))
--------------------------------------------------------- AND/OR 6
10 noa2a2a23_x1 0.8 1.2 nq <= /((i0<13>.i1<14>) +(i2<14>.i3<14>)
+(i4<14>.i5<14>))
13 noa2a2a23_x4 4.3 1.3 nq <= /((i0<13>.i1<14>) +(i2<14>.i3<14>)
+(i4<14>.i5<14>))
12 oa2a2a23_x2 2.1 1.4 q <= ((i0<13>.i1<14>) +(i2<14>.i3<14>)
+(i4<14>.i5<14>))
13 oa2a2a23_x4 4.3 1.4 q <= ((i0<13>.i1<14>) +(i2<14>.i3<14>)
+(i4<14>.i5<14>))
--------------------------------------------------------- AND/OR 7
9 noa3ao322_x1 0.6 1.2 nq <= /((i0<13>.i1<13>.i2<12>)
+((i3<13>+i4<13>+i5<13>).i6<13>))
11 noa3ao322_x4 4.3 1.4 nq <= /((i0<10>.i1<9>.i2<9>)
+((i3<9>+i4<9>+i5<9>).i6<9>))
10 oa3ao322_x2 2.1 1.2 q <= /((i0<10>.i1<9>.i2<9>)
+((i3<9>+i4<9>+i5<9>).i6<9>))
11 oa3ao322_x4 4.3 1.3 q <= /((i0<10>.i1<9>.i2<9>)
+((i3<9>+i4<9>+i5<9>).i6<9>))
--------------------------------------------------------- AND/OR 8
14 noa2a2a2a24_x1 0.6 1.4 nq <= /((i0<14>.i1<14>)+(i2<13>.i3<13>)
+(i4<13>.i5<13>)+(i6<14>.i7<14>))
17 noa2a2a2a24_x4 4.3 1.7 nq <= /((i0<14>.i1<14>)+(i2<14>.i3<13>)
+(i4<13>.i5<13>)+(i6<14>.i7<14>))
15 oa2a2a2a24_x2 2.1 1.5 q <= ((i0<14>.i1<14>)+(i2<14>.i3<13>)
+(i4<13>.i5<13>)+(i6<14>.i7<14>))
16 oa2a2a2a24_x4 4.3 1.6 q <= ((i0<14>.i1<14>)+(i2<14>.i3<13>)
+(i4<13>.i5<13>)+(i6<14>.i7<14>))
------------------------------------------------------ MULTIPLEXER
7 nmx2_x1 1.2 1.0 nq <= /((i0<14>./cmd<21>)+(i1<14>.cmd))
12 nmx2_x4 4.3 1.3 nq <= /((i0<8>./cmd<14>)+(i1<9>.cmd))
9 mx2_x2 2.1 1.1 q <= (i0<8>./cmd<17>)+(i1<9>.cmd)
10 mx2_x4 4.3 1.3 q <= (i0<8>./cmd<17>)+(i1<9>.cmd)
12 nmx3_x1 0.4 1.2 nq <= /((i0<9>./cmd0<15>)
+(((i1<8>.cmd1<15>)+(i2<8>./cmd1)).cmd0))
15 nmx3_x4 4.3 1.7 nq <= /((i0<9>./cmd0<15>)
+(((i1<8>.cmd1<15>)+(i2<8>./cmd1)).cmd0))
13 mx3_x2 2.1 1.4 q <= ((i0<9>./cmd0<15>)
+(((i1<8>.cmd1<15>)+(i2<8>./cmd1)).cmd0))
14 mx3_x4 4.3 1.6 q <= ((i0<9>./cmd0<15>)
+(((i1<8>.cmd1<15>)+(i2<8>./cmd1)).cmd0))
-------------------------------------------------------------- XOR
9 nxr2_x1 1.2 1.1 nq <= /(i0<21>^i1<22>)
11 nxr2_x4 4.3 1.2 nq <= /(i0<20>^i1<21>)
9 xr2_x1 1.2 1.0 q <= (i0<21>^i1<22>)
12 xr2_x4 4.3 1.2 q <= (i0<20>^i1<21>)
-------------------------------------------------------- FLIP-FLOP
nq <=/((i0<11>./cmd<13>)+(i1<7>.cmd))
18 sff1_x4 4.3 1.7 IF RISE(ck<8>)
q <= i<8>
24 sff2_x4 4.3 1.9 IF RISE(ck<8>)
q <= ((i0<8>./cmd<16>)+(i1<7>.cmd))
28 sff3_x4 4.3 2.4 IF RISE(ck<8>)
q <= (i0<9>./cmd0<15>)
+(((i1<8>.cmd1<15>)+(i2<8>./cmd1)).cmd0)
------------------------------------------------------------ ADDER
16 halfadder_x2 2.1 1.2 sout <= (a<27>^b<22>)
2.1 1.0 cout <= (a.b)
18 halfadder_x4 4.3 1.3 sout <= (a<27>^b<22>)
4.3 1.1 cout <= (a.b)
20 fulladder_x2 2.1 1.8 sout <= (a*<28>^b*<28>^cin*<19>)
2.1 1.4 cout <= (a*.b*+a*.cin*+b*.cin*)
21 fulladder_x4 4.3 2.2 sout <= (a*<28>^b*<28>^cin*<19>)
4.3 1.5 cout <= (a*.b*+a*.cin*+b*.cin*)
---------------------------------------------------------- SPECIAL
3 zero_x0 0 0 nq <= '0'
3 one_x0 0 0 q <= '1'
2 tie_x0 0 0 Body tie cell
1 rowend_x0 0 0 Empty cell
==================================================================
NEW CELLS
It is possible to add new cells in the library just by providing the 3 files .ap, .al and
.vbe in the standard cell directory. The layout view can be created with the symbolic
editor graal. The physical outline is given above. The net-list view can be
automatically generated with the lynx extractor. The behavioral view must be written by
the designer and checked with the yagle functional abstractor. The file must contain the
generic fields in order to be used by the logic synthesis tools and the I/Os terminals
must be in the same order (alphabetic) in the .vbe and .al files.
If you develop new cells, please send the corresponding files to
alliance-users@asim.lip6.fr
VHDL FILES
You can find below the commented VHDL GENERIC for the na2_x4 cell.
ENTITY na2_x4 IS
GENERIC (
CONSTANT area : NATURAL := 1750; -- lamba * lambda
CONSTANT transistors : NATURAL := 10; -- number of
CONSTANT cin_i0 : NATURAL := 10; -- femto Farad for i0
CONSTANT cin_i1 : NATURAL := 10; -- femto Farad for i1
CONSTANT tplh_i1_nq : NATURAL := 606; -- propag. time in pico-sec
-- from i1 falling
-- to nq rizing
CONSTANT rup_i1_nq : NATURAL := 890; -- resitance in Ohms when nq
-- rizing due to i1 change
CONSTANT tphl_i1_nq : NATURAL := 349; -- propag time when nq falls
CONSTANT rdown_i1_nq : NATURAL := 800; -- resist when nq falls
CONSTANT tplh_i0_nq : NATURAL := 557; -- idem for i0
CONSTANT rup_i0_nq : NATURAL := 890;
CONSTANT tphl_i0_nq : NATURAL := 408;
CONSTANT rdown_i0_nq : NATURAL := 800
);
PORT (
i0 : in BIT;
i1 : in BIT;
nq : out BIT;
vdd : in BIT;
vss : in BIT
);
SEE ALSO
MBK_CATA_LIB (1), catal(1), ocp(1), nero(1), cougar(1), boom(1), loon(1), boog(1),
genlib(1), ap(5), al(5), vbe(5)