Hi, I have found reram in sky130B . So I can draw ...
# sky130b
Binoy B
03/23/2022, 12:28 PMHi, I have found reram in sky130B . So I can draw a rectangle and use paint reram command in magic to get one. But there is a doubt regarding taking connections. Is it like, from one side of reram I connect a metal 1 layer through via and and on the other side I connect metal2 through via? Please give suggestions.
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Tim Edwards
03/23/2022, 12:58 PMThe ReRAM device drawn in magic is a combination of the ReRAM and VIA layers. You just need to connect to it with metal1 and metal2. In magic, the ReRAM will be shown as connected to metal2 but not metal1, but it will be extracted as a device connected between metal1 and metal2.
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Harald Pretl
03/23/2022, 4:59 PM@User Is the ReRAM device documented? Especially the electric spec would be really interesting.
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Binoy B
03/23/2022, 5:03 PM@User I have created a simple reram array layout in magic and corresponding netlist is simulated using ngspice. I get the following error...'unknown subckt: x0 out2 in2 sky130_fd_pr__reram_reram_cell area_ox=4770'
Binoy B
03/23/2022, 5:04 PMI have actually included the subcircuit definition in netlist.........* SPICE3 file created from testarray.ext - technology: sky130B
.subckt sky130_fd_pr_reram__reram_cell BE TE
R0 BE TE 0.000000
.ends
.option scale=10000u
X0 out2 in2 sky130_fd_pr__reram_reram_cell area_ox=4770
X1 out1 in2 sky130_fd_pr__reram_reram_cell area_ox=6039
X2 out2 in1 sky130_fd_pr__reram_reram_cell area_ox=3655
X3 out1 in1 sky130_fd_pr__reram_reram_cell area_ox=3774
vin in1 in2 pwl (0 0 10ms 0 11ms 5v 20ms 5v)
*transient analysis for 20ms, step size 0.02ms
.tran 0.02ms 20ms
*defining the run-time control functions
.control
run
*plotting input and output voltages
plot v(out1) v(out2)
.endc
.end
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Tim Edwards
03/23/2022, 5:18 PM@User: Simulation will be problematic because there is no SPICE model for the ReRAM device. There is a verilog-AMS model, but using it in ngspice requires it to be compiled into the ngspice executable itself. I have not attempted that myself. It should be a bit easier to do in Xyce, which allows plug-in objects for verilog-AMS modules. I haven't tried that myself, either.
Tim Edwards
03/23/2022, 5:20 PM@User, @User: This link from Tim Ansell is the best reference I've seen for the ReRAM device: https://sky130-fd-pr-reram.readthedocs.io/en/latest/technology_specifications.html#forming
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Harald Pretl
03/23/2022, 6:07 PMThanks, that is helpful!
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