Hello, I am working with the LPC54Sxx IBIS model, and it is unclear to me which models are intended to be used to confirm signal integrity as a pin outputs to a transmission line. For example, there are two main models, MFIOHST5V_3V3_XX_ZZ and MFIOT5V_3V3_XX_ZZ
Where: XX can be PU,PD,RP,ZS and ZZ can be HS or LS.
I understand that PU = Pull Up, PD = Pull Down, but what does RP = ? and ZS = ? (I'm guessing high impedance?). Is HS = High Speed and LS = Low Speed?
If I want to model the effects on signal integrity from PIO0_16 (ball M4 on the 180 pin BGA), which is Ethernet TXD_0 Out, which model should I use?
Here is the LPC54Sxx page, where the datasheet and IBIS model are located: https://www.nxp.com/part/LPC54S016JBD100#/
解決済! 解決策の投稿を見る。
Hello wleismer,
>>>> The definitions are below and can be controlled via IOCON register.
Hs – slew rate is fast mode
Ls – slew rate is standard mode
Rp – simulated open drain mode enabled
PU means internal pull-up enabled
PD means internal pull-down enabled
ZS – disable internal pull-up and disable internal pull-down
Use the MFIOT5V model since pad type for PIO0_16 is MFIOT5V
BR
Alice
I was able to confirm some of my questions using the IBIS Modeling Cookbook. In it, it states that each model can be for Input, Output, or I/O, so that is clear to me now. It is also clear that the PU model is to be used for output driving high, and the PD model is to be used for output driving low. What remains unclear is the following:
RP means ?
ZS means?
HS means?
LS means?
Thanks Alice!
Hello wleismer,
>>>> The definitions are below and can be controlled via IOCON register.
Hs – slew rate is fast mode
Ls – slew rate is standard mode
Rp – simulated open drain mode enabled
PU means internal pull-up enabled
PD means internal pull-down enabled
ZS – disable internal pull-up and disable internal pull-down
Use the MFIOT5V model since pad type for PIO0_16 is MFIOT5V
BR
Alice
Excellent, thank you so much Alice!