JAJSI09I September 2009 – October 2019 DS90UR905Q-Q1 , DS90UR906Q-Q1
PRODUCTION DATA.
The OP_ LOW feature is used to hold the LVCMOS outputs (except the LOCK output) at a LOW state. The user must toggle the OP_LOW Set / Reset register bit to release the outputs to the normal toggling state.
NOTE
The release of the outputs can only occur when LOCK is HIGH. When the OP_LOW feature is enabled, anytime LOCK = LOW, the LVCMOS outputs will toggle to a LOW state again. The OP_ LOW strap pin feature is assigned to output PASS pin 42.
Restrictions on other straps:
Outputs RGB[7:0], HSYNC, VSYNC, DE, and PCLK are in TRI-STATE before PDB toggles HIGH because the OP_LOW strap value has not been recognized until the DS90UR906Q-Q1 powers up. Figure 30 shows the user controlled release of OP_LOW and automatic reset of OP_LOW set on the falling edge of LOCK. Figure 31 shows the user controlled release of OP_LOW and manual reset of OP_LOW set.
NOTE
Manual reset of OP_LOW can only occur when LOCK is H.