TMS320F2800157-Q1: EPWM X-BAR Mux Configuration Table

Relationship Between G0–G31 and TRIP4–TRIP12

G0 through G31 are the 32 mux input groups defined in Table 10-2. TRIP4 through TRIP12 are the output signals of the ePWM X-BAR. The relationship is: each TRIP output can independently select any combination of the 32 mux groups (G0–G31) as its input sources.

Here's how the architecture works:

Table 10-2 Defines the Mux Inputs (G0–G31)

Table 10-2 shows what signal each mux group can select. Each group (G0–G31) has four possible input signals (columns 0, 1, 2, 3) — for example, G0 column 1 is CMPSS1_CTRIPH_OR_CTRIPL, and G31 column 1 is INPUTXBAR14 [1]. You use the TRIPxMUXnCFG registers to pick which of the four column inputs each mux group passes through.

TRIP Signals Are Outputs That Aggregate the Mux Groups

TRIP4, TRIP5, TRIP7, TRIP8, TRIP9, TRIP10, TRIP11, and TRIP12 are the eight output signals from the ePWM X-BAR that route to all ePWM modules [2][3]. Each TRIP output has its own set of configuration and enable registers:

Key point: Table 10-2 is shared across all TRIP outputs. Every TRIP signal (TRIP4–TRIP12) uses the same 32 mux groups, but each TRIP has its own configuration registers that independently select which column input each mux passes and which mux groups are enabled. The enabled mux outputs are OR'd together to produce the final TRIP signal.

So G0–G31 are not "assigned" to specific TRIP signals — rather, each TRIP signal can use any or all of G0–G31 simultaneously, configured independently through its own registers.

1. TMS320F2800157 Technical Reference Manual - Table 10-2
2. TMS320F2800157 Technical Reference Manual - X-BAR Input Sources (Figure 10-4)
3. TMS320F2800157 Technical Reference Manual - ePWM Crossbar Overview
4. TMS320F2800157 Technical Reference Manual - EPWM_XBAR_REGS Registers (Table 10-34)