Re: cPCI generic 5V Ibis Models

"Ruston, Matt" wrote:
>
> All:
>
> Hi. I'm trying to do 5V Compact PCI sims and am in need of strong and weak
> models. In the cPCI draft spec (PICMG 2.0 D3.0) dated July 21, 1999, there
> is reference in Appendix A (Pg 79) to models and they plot the I-V curves
> referenced to the min-max specs. Does anyone have these models (either Ibis
> or Spice) and can they forward them to me? If not, does anyone have anything
> that is close to covering the full range of the cPCI 5V signaling specs?

If someone wants to modify them, I've build a set of V/I models for
AGP, which is similar to the PCI specs. Shouldn't be too tough.

Models attached.

-- 
D. C. Sessions
dc.sessions@vlsi.com

* AGP 2.0 V/I curve functions
* Source:
* AGP specification rev. 2.0 Figure 4-29 (3.3v)
* AGP specification rev. 2.0 Figure 4-30 (1.5v)
* AGP specification rev. 2.0 Figure 4-33 (1.5v)

* Maximum pullup current at 3.3v
.SUBCKT ioh33max pad vddq vssq
E1 vddq offs
+ VOL='0.3*v(vddq,vssq)'
E2 offs pad
+ VOL='((i(E1)/54m)*v(vddq,vssq)/(v(pad,vssq)+(0.4*v(vddq,vssq))))-v(vddq,offs)'
+ MAX=0
.ENDS ioh33max

* Maximum pulldown current at 3.3v
.SUBCKT iol33max pad vddq vssq
E1 offs vssq
+ VOL='0.18*v(vddq,vssq)'
E2 pad offs
+ VOL='((i(E1)/141m)*v(vddq,vssq)/v(vddq,pad))-v(offs,vssq)'
+ MAX=0
.ENDS iol33max

* Minimum pullup current at 3.3v
.SUBCKT ioh33min pad vddq vssq
.PARAM
+ rline = '0.7/9m'
E1 vddq offs VOL='0.1*v(vddq,vssq)'
E2 offs pad
+ VOL='(i(E2)*rline)-v(vddq,offs)'
+ MIN=0 MAX=4
G1 offs pad
+ CUR='(v(vddq,vssq)*0.7/rline)-i(E2)' MIN=-50m MAX=0
R1 vddq pad 1e8
.ENDS ioh33min

* Minimum pulldown current at 3.3v
.SUBCKT iol33min pad vddq vssq
.PARAM
+ rline = '0.6/12m'
E1 offs vssq VOL='0.1*v(vddq,vssq)'
E2 pad offs
+ VOL='(i(E2)*rline)-v(offs,vssq)'
+ MIN=0 MAX=4
G1 pad offs
+ CUR='(v(vddq,vssq)*0.6/rline)-i(E2)'
+ MIN=-50m MAX=0
R1 pad vssq 1e8
.ENDS iol33min

* 1.5v constraint curves

* Maximum pullup current at 1.5v (per 4-30)
.SUBCKT ioh15max1 pad vddq vssq
E1 vddq offs
+ VOL='0.3*v(vddq,vssq)'
E2 offs pad
+ VOL='((i(E1)/111m)*v(vddq,vssq)/v(pad,vssq))-v(vddq,offs)'
+ MAX=0
.ENDS ioh15max1

* Maximum pulldown current at 1.5v (per 4-30)
.SUBCKT iol15max1 pad vddq vssq
E1 offs vssq
+ VOL='0.3*v(vddq,vssq)'
E2 pad offs
+ VOL='((i(E1)/111m)*v(vddq,vssq)/v(vddq,pad))-v(offs,vssq)'
+ MAX=0
.ENDS iol15max1

* Minimum pullup current at 1.5v (per 4-30)
.SUBCKT ioh15min1 pad vddq vssq
.PARAM
+ rline = '0.675/11m'
E1 vddq offs VOL='0.1*v(vddq,vssq)'
E2 offs pad
+ VOL='(i(E2)*rline)-v(vddq,offs)'
+ MIN=0 MAX=2
G1 offs pad
+ CUR='(v(vddq,vssq)*0.675/rline)-i(E2)' MIN=-50m MAX=0
R1 vddq pad 1e8
.ENDS ioh15min1

* Minimum pulldown current at 1.5v (per 4-30)
.SUBCKT iol15min1 pad vddq vssq
.PARAM
+ rline = '0.675/11m'
E1 offs vssq VOL='0.1*v(vddq,vssq)'
E2 pad offs
+ VOL='(i(E2)*rline)-v(offs,vssq)'
+ MIN=0 MAX=2
G1 pad offs
+ CUR='(v(vddq,vssq)*0.675/rline)-i(E2)'
+ MIN=-50m MAX=0
R1 pad vssq 1e8
.ENDS iol15min1

* Maximum pullup current at 1.5v (per 4-33)
.SUBCKT ioh15max2 pad vddq vssq
.PARAM
+ ib1 = '200m/9'
E1 vddq pad2 VOL='MIN(v(vddq,pad),v(vddq,vssq)/2)
G1 vddq pad
+ CUR='ib1*(v(vddq,pad)+(v(pad2,vssq)*v(vddq,pad2)/v(vddq,vssq)))'
R1 vddq pad 1e8
.ENDS ioh15max2

* Maximum pulldown current at 1.5v (per 4-33)
.SUBCKT iol15max2 pad vddq vssq
.PARAM
+ ib1 = '200m/9'
E1 pad2 vssq VOL='MIN(v(pad,vssq),v(vddq,vssq)/2)
G1 pad vssq
+ CUR='ib1*(v(pad,vssq)+(v(pad2,vssq)*v(vddq,pad2)/v(vddq,vssq)))'
R1 pad vssq 1e8
.ENDS iol15max2

* Minimum pullup current at 1.5v (per 4-33)
.SUBCKT ioh15min2 pad vddq vssq
.PARAM
+ k1 = 48 $ 1/20.833m
+ k2 = 600 $ 1/1.667m
+ k3 = 'k2-k1'
E1 n1 vddq VOL='MIN(-0.15*v(vddq,vssq),48*i(E1))'
E2 pad n1 VOL='MIN(0,k3*(i(E1)+(0.5*v(vddq,vssq)/k1)))'
.ENDS ioh15min2

* Minimum pulldown current at 1.5v (per 4-33)
.SUBCKT iol15min2 pad vddq vssq
.PARAM
+ k1 = 48 $ 1/20.833m
+ k2 = 600 $ 1/1.667m
+ k3 = 'k2-k1'
E1 n1 vssq VOL='MAX(0.15*v(vddq,vssq),48*i(E1))'
E2 pad n1 VOL='MAX(0,k3*(i(E1)-(0.5*v(vddq,vssq)/k1)))'
.ENDS iol15min2
Received on Thu Jan 6 11:25:35 2000