USB on-the-go full-speed (OTG_FS) RM0402
1116/1163 RM0402 Rev 6
Once the MAC receives an IN token, this information (token received) is synchronized to the
AHB clock by the PFC (the PFC runs on the AHB clock). The PFC then reads the data from
the SPRAM and writes them into the dual clock source buffer. The MAC then reads the data
out of the source buffer (4 deep).
If the AHB is running at a higher frequency than the PHY, the application can use a smaller
value for TRDT (in OTG_GUSBCFG).
Figure 354 has the following signals:
• tkn_rcvd: Token received information from MAC to PFC
• dynced_tkn_rcvd: Doubled sync tkn_rcvd, from PCLK to HCLK domain
• spr_read: Read to SPRAM
• spr_addr: Address to SPRAM
• spr_rdata: Read data from SPRAM
• srcbuf_push: Push to the source buffer
• srcbuf_rdata: Read data from the source buffer. Data seen by MAC
To calculate the value of TRDT, refer to Table 206: TRDT values (FS) .
Figure 354. TRDT max timing case
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