Hello, I am new to Flash Magic and MCB900.
I need to read the CRC values of pre-programmed 89LPC922's which are already soldered onto fully populated circuit boards. VDD is connected directly to the boards 3.3V bus.
This is in a production enviromnent using automated test equipment and a bed-of-nails fixture. My plan is to use Flash Magic and the MCB900 board wired to the bed of nails.
Problem is that the VDD of the 89LPC922 is already supplied by the board it is installed on, and I won't be able to control VDD and supply the T1 pulse on VDD.
According to the 89LPC922 datasheets, only T2 should matter: "RST delay from VDD active". Why does the device need T1?
I read some postings about write-once-only if VDD is not controlled. I don't plan on writing, only reading CRC.
Will Flash Magic still be able to establish communication with the device and read CRC if VDD is always high?
Will this work? I don't have the MCB900 yet but I need to know if it will work before I purchase.
Thank you kindly.
I need to read the CRC values of pre-programmed 89LPC922's which are already soldered onto fully populated circuit boards. VDD is connected directly to the boards 3.3V bus.
This is in a production enviromnent using automated test equipment and a bed-of-nails fixture. My plan is to use Flash Magic and the MCB900 board wired to the bed of nails.
Problem is that the VDD of the 89LPC922 is already supplied by the board it is installed on, and I won't be able to control VDD and supply the T1 pulse on VDD.
According to the 89LPC922 datasheets, only T2 should matter: "RST delay from VDD active". Why does the device need T1?
I read some postings about write-once-only if VDD is not controlled. I don't plan on writing, only reading CRC.
Will Flash Magic still be able to establish communication with the device and read CRC if VDD is always high?
Will this work? I don't have the MCB900 yet but I need to know if it will work before I purchase.
Thank you kindly.