DocID027699 Rev 2

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AN4676

Peripheral interconnect matrix

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

RM0385 reference manual.

2.5.3

From ETH 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 ITR1_RMP (bits 11 and 10) in the TIM2 option register

(TIM2_OR).

Figure 7. PTP trigger output to TIM2 ITR1 connection

The interconnection between ETH and TIM2 is described in the precision time protocol

(IEEE 1588 PTP) section of RM0385 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] of the DMA_SxCR

register. The 8 requests from the peripherals (TIM, ADC, SPI, I2C, etc.) are independently

connected to each channel and their connection depends on the product implementation.

This interconnection is explained in the following tables of RM0385 reference manual:

•

DMA1 request mapping

•

DMA2 request mapping

For more details on the DMA description, refer to DMA general description of RM0385

reference manual.