Figure 415. Trdt Max Timing Case - ST STM32F423 Reference Manual

RM0430
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 415
•
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
has the following signals:

Figure 415. TRDT max timing case

RM0430 Rev 8
USB on-the-go full-speed (OTG_FS)
Table 229: TRDT values (FS)
.
1277/1324
1283