ARM Cortex-A72 64-bit multiply (MADD) instruction low throughput

Hi, I've been benchmarking performance of Cortex-A72 CPU on Raspberry Pi 4 Model B Rev 1.1. It looks like the throughput of int64 multiply (MADD) instruction is about 1/3rd of multiply instructions for...
ARM Cortex-A72 64-bit multiply (MADD) instruction low throughput

Hi, I've been benchmarking performance of Cortex-A72 CPU on Raspberry Pi 4 Model B Rev 1.1. It looks like the throughput of int64 multiply (MADD) instruction is about 1/3rd of multiply instructions for...
Boundary Scan

Hi can anyone please explain me what's boundary scan in JTAG is?? and how it can be used to check the interconnect in PCB or inside an IC without connecting actual pin??
KEYBOARD scanning

I am developing an 8051 based keypad module. Problem i am facing is that program is scanning port very fast so that a simngle keypress will be taken as multiple presses. To over come this a delay was...
Boundary scan

I have the DS-5 with Dstream, and I want to do a boundary scan to find the stage of every pin, how do I do that? and where can I find the manual for this?