TMS320F280025C: About XBar, some questions

Hi,

Matt Dash said:

1.Does xbar have requirements for GPIO configuration, such as open drain output or pullup?

No. XBAR is simply connectivity configuration.  Pullup etc can be configured in GPIO block.

Matt Dash said:

2.what will happen if i enable open drain output or pullup?

Open drain: signal will not be driven high. it'll be active lo or undriven.
Pull up: connected to IO supply (VDDIO) via resistor. Please see details in data sheet.

Matt Dash said:

in 280025 trm,  “Figure 9-5. ePWM and Output X-BARs Sources”   there 'is an EQEP signal, but i canot find it in  trm xbar part, did i miss something?

i don't think there is any signal going from ePWM XBAR to EQEP.

Matt Dash said:

4.by the way, 280025 trm( SPRUIN7A) " 9.3 XBAR Registers" miss some clb bar registers(clb_in, clb_out ).

Table 9-63. CLB_XBAR_REGS Registers has the needed info.