EZ-USB Datasheet, PDF (240/334 Pages) Cypress Semiconductor – The EZ-USB USB Integrated Circuit

Bit 2:
WPOL
FWR# Pulse Polarity
The 8051 sets WPOL=0 for active-low FWR# pulses, and WPOL=1 for active high
FWR# pulses.
Bit 1-0:
WMOD
FWR# Pulse Mode
These bits select the phasing and width of the FWR# pulse. See Figure 8-11.
EZ-USB TRM v1.9
Chapter 12. EZ-USB Registers
Page 12-47