The In-System Memory Content Editor allows you to read data from and write data to in-system memory in a device while the device is running at speed and independently of system clocks with a JTAG interface. You can use the In-System Memory Content Editor to debug designs, for example, by injecting faults into in-system memory while the device is running at speed, or by changing the value of coefficients in DSP applications.
You can open the In-System Memory Content Editor after instantiating in the design one or more altsyncram megafunctions with the Allow In-System Memory Content Editor to capture and update content independently of the system clock option turned on. Once you compile the design and program a device, you can read the contents of the in-system memory of the device in the HEX Editor pane. You can use the Continuously Read Data from In-System Memory and the Continuously Read Selected Words from In-System Memory commands to monitor changes to in-system memory. If you make any changes to the contents of an instance in the HEX Editor pane, you can write the changes to in-system memory. You can also import and export data, and manipulate the data in the HEX Editor pane of the In-System Memory Content Editor.