Putting Altera MAX Series in Hibernation Mode Using User Flash Memory

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ID 683668
Date 1/14/2016
Public
Document Table of Contents
Document Table of Contents x
1. Putting Altera MAX Series in Hibernation Mode Using User Flash Memory
1. Putting Altera MAX Series in Hibernation Mode Using User Flash Memory x
1.1. Design Example Description 1.2. External Hardware Circuitry 1.3. Design in the MAX II Device 1.4. Design in the MAX 10 Device 1.5. Document Revision History
1.3. Design in the MAX II Device x
1.3.1. 4-Bit Binary Up-Counter 1.3.2. Data Controller 1.3.3. Timer 1.3.4. User Flash Memory Instantiation Module 1.3.5. User Flash Memory Data Save and Retrieval Method
1.4. Design in the MAX 10 Device x
1.4.1. 4-Bit Binary Up-Counter 1.4.2. 16-Bit Binary Slow Counter 1.4.3. Main Controller 1.4.4. Random Start Block
1. Putting Altera MAX Series in Hibernation Mode Using User Flash Memory

1.3.2. Data Controller

When the data controller receives the signal from the timer indicating that the device does not have any activity for a pre-defined duration, the controller automatically reads the data from the counter and writes the data into the UFM. Upon completion of the task, the data controller then asserts the Power-Down-Ready signal high for the external circuitry to power down the device.

When the device powers up, the data controller automatically goes to the location in the UFM where the data from the counter is stored, and reads back the data before the device powers down again. The controller then reloads the registers of the counter with the data.

The data controller interfaces with the module that instantiates the UFM through the Altera proprietary interface protocol. The controller writes the data to a blank location in the UFM every time before the device is powered down, and reads back the data from the correct location when the device is powered back up.

The controller uses almost all the addresses in sector 0 of the UFM for data storing purposes. The erase operation takes additional time to complete, so when the UFM sector is full, the controller automatically erases that sector.

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