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現在2207件がヒットしています。check
Hello, this is Ume Onigiri.
I decided to make a digital clock using Altera's Cyclone ® IV E in the production practice.
First, consider what voltage should be supplied to the device.
After some research, I found that the Cyclone IV E has multiple power supplies: VCCINT, VCCIO, VCCA, and VCCD_PLL.
This time, we will study the roles of these four power sources.
VCCINT
VCCINT is the power supply for the device internal logic.
You can check the supply voltage from Quartus ® II Assignments → Device Core Voltage.
By the way, the device used this time is EP4CE6E22C6, so 1.2 V is supplied to the VCCINT pin.
VCCIO
VCCIO is the power supply for I/O.
The Cyclone IV E has 8 I/O banks and each I/O bank can be powered differently.
An I/O bank can supply 1.2V, 1.5V, 1.8V, 2.5V, 3.0V, or 3.3V.
You can choose the voltage level for each I/O bank according to your board specifications.
Note, however, that VCCIO pins within the same I/O bank must be supplied with the same voltage.
VCCA, VCCD_PLL
Both VCCA and VCCD_PLL are power supplies for the PLL.
Cyclone IV E requires VCCA to be 2.5 V and VCCD_PLL to be the same voltage as VCCINT.
PLL is not used in the design of the digital clock that will be made in this production practice.
So I figured I should supply voltage to VCCINT and VCCIO, but not VCCA and VCCD_PLL.
However, I decided that it is not good to make decisions based on my own assumptions, so I checked Cyclone IV's Pin Connection Guidelines.
Then I found a description that both the VCCA pin and the VCCD_PLL pin should be connected even if the PLL is not used.
I'm horrified to think that if I ignored those two power supplies and proceeded, I might have destroyed the device.
Summary
Depending on the device family, some device families may have different power supplies than the ones introduced here.
This time, I felt that it is important to check the pin connection guidelines of the device to confirm whether or not it is connected, even if it is not the power supply for the part to be used.
Two devices were provided in the production training, including spares.
If I destroy all these two devices, maybe I have to buy a device out of my own pocket?
It was Ume Onigiri that I decided to carefully check while holding such anxiety.
*For the processing method on the board, please refer to the documents such as Pin Connection Guidelines and Pin-Out File provided by Altera, as well as the Quartus II Fitter Report.