Medium vs Fast I/O Pads

bchang32 — Thu, 10 Mar 2022 13:46:49 GMT

What is meant by Medium and Fast I/O Pads and what determines each?

It appears that the eTPU signals are medium I/O Pads, but is there a way to tell as well as what the diference is? eTPU can go up to 200 MHz. What is the eMIOS pad considered?

I'm looking specifically at the MPC5775E.

Re: Medium vs Fast I/O Pads

davidtosenovjan — Fri, 11 Mar 2022 09:50:29 GMT

According DS terminology, there are following pad types used with MPC5775E:

1. pad_sr_hv = General-purpose I/O pads
- Input specification (DS Table 6)
- Output specification(DS Table 9)

2. pad_ae_hv = Input-only analog pads
- Input specification (DS section 3.8)

3. pad_isatww_st_hv = Input-only pads = Analog and digital input pads
- Input specification (DS section 3.8 and Table 6)

5. pad_sr_hv +MSC = LVDS pads
- Input specification (DS Table 6 and Section 3.10)
- Output specification(DS Table 6 and Section 3.10)

6. pad_sr_hv w/ LFAST = LVDS pads
- Input specification (DS Table 6 and Section 3.10)
- Output specification(DS Table 6 and Section 3.10)

7. pad_fc_hv = EBI pads
- Input specification (DS Table 6, Table 38 for EBI)
- Output specification(DS Table 10, Table 38 for EBI)

I/O Power Domain is specified in the excel sheet MPC5775B_MPC5775E_System_IO_Definition.xlsx (embedded in the RM), column "I/O Power Domain".

VDDEx is considered as I/O supply voltage for fast I/O pads. VDDEHx is considered as I/O supply voltage for medium I/O pads. However medium/fast marking does not make any sense on this device and there are 7 pad typed on this device. It is rather simplified designation.

topic Medium vs Fast I/O Pads in MPC5xxx

Medium vs Fast I/O Pads

Re: Medium vs Fast I/O Pads