r8a66597 Renesas Electronics Corporation., r8a66597 Datasheet - Page 154

• Manufacturer Part Number: r8a66597
• Description: Assp Usb2.0 2 Port Host/1 Port Peripheral Controller
• Manufacturer: Renesas Electronics Corporation.

R8A66597FP/DFP/BG
3.10.1 SOF Pulse Output
R e v 1 . 0 1
When SOF output is enabled, the controller outputs the SOF pulse according to the SOF timing.
SOF pulse output is valid when either the Host or Peripheral Controller Function is selected.
When the value of the SOFCFG register OSFM bit is “01” (1ms SOF) or “10” (125µs SOF), the pulse is output in the
“L” active state from the SOF N pin. This is called the “SOF signal”. For more details concerning the pulse timing, refer
to Figure 3.24. When using the Peripheral Controller function, SOF packet receive or SOF output due to “SOF
interpolation” are output at even intervals.
O c t 1 7 , 2 0 0 8
USB Bus
SO F
p a g e 1 5 4 o f 1 8 3
SYNC
Figure 3.24 SOF Output Timing
SO F packet
PID
1m s(Full-Speed) / 125us(High-Speed)
FRAME
CRC5
m inim un 640ns