DocID027335 Rev 2

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AN4640

Peripherals interconnect matrix

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USB (OTG_FS SOF) and USB (OTG HS SOF) can generate a trigger to general-purpose

timer (TIM2), as shown in Figure 5.

Figure 5. SOF connectivity

The interconnection between USB and TIM2 is described in the “SOF trigger” section of

RM0390 and RM0090 reference manuals.

2.5.3

From ETH block to TIM

The MAC can generate a trigger to general-purpose timer (TIM2).

This PTP trigger signal is connected to the TIM2 ITR1 input selectable by software. The

connection is enabled through bits 11 and 10 in the TIM2 option register (TIM2_OR).

Figure 6. PTP trigger output to TIM2 ITR1 connection

Connection of ETH to TIM2 is described in the section “Precision time protocol (IEEE1588

PTP)” of the RM0090 reference manual.

2.5.4

From Communication interfaces to DMA

Refer to Section 2.6: DMA block.

2.6

DMA block

Each stream is associated with a DMA request that can be selected out of 8 possible

channel requests. The selection is controlled by the CHSEL[2:0] bits in the DMA_SxCR