I am writing a VHDL code to drive a DRS4 chip.
In order to configure the DRS4 chip, I have to set the "Config Register" and the "Write Shift Register" then ... (I do not plan to use simultaneous WR and R so I guess the Write Config Reg. is not needed)
My question is :
When do we have to perform a "Read Shift Register Initialization" ?
Every time before a full read-out, or juste once after a DRS4 reset ?
Further more, is this initialization needed for the ROI mode ?
And at last do the level of the DENABLE and DWRITE signals matter for the "Read Shift Register Initialization" ?
(To sum up : what is the purpose of the Read Shift Register and how does it work ?)