Altera Arria II GX FPGA - Manual (Page 25)

Chapter 6: Board Test System 6–5
Using the Board Test System
February 2011 Altera Corporation Arria II GX FPGA Development Kit User Guide
MAX II Registers
The MAX II registers control allow you to view and change the current MAX II
register values as described in
Table 6–1 . Changes to the register values with the GUI
take effect immediately. For example, selecting a new frequency in the OCR1 list
immediately changes the clock frequency on the board.
■ PSO —Sets the MAX II PSO register. The following options are available:
■ Use PSR —Allows the PSR to determine the page of flash memory to use for
FPGA reconfiguration.
■ Use PSS —Allows the PSS to determine the page of flash memory to use for
FPGA reconfiguration.
Table 6–1. MAX II Registers
Register Name
Read/Write
Capability
Description
System Reset
(SRST)
Write only Set to 0 to initiate an FPGA reconfiguration.
Page Select Register
(PSR)
Read / Write
Determines which of the up to eight (0-7) pages of flash
memory to use for FPGA reconfiguration. The flash memory
ships with pages 0 and 1 preconfigured.
Page Select Override
(PSO)
Read / Write
When set to 0, the value in PSR determines the page of
flash memory to use for FPGA reconfiguration. When set to
1, the value in PSS determines the page of flash memory to
use for FPGA reconfiguration
Page Select Switch
(PSS)
Read only
Holds the current value of the illuminated CONFIG LED
(D11-D13) based on the following encoding:
■ 0 = CONFIG LED (D13) and corresponds to the flash
memory page for the factory hardware design
■ 1 = CONFIG LED (D12) and corresponds to the flash
memory page for the user hardware 1 design
■ 2 = CONFIG LED (D11) and corresponds to the flash
memory page for the user hardware 2 design
Oscillator Control
Register 1 (OCR1)
Read / Write
Determines the U26 oscillator output frequency based on
the following options:
■ 0 = 100 MHz
■ 1 = 125 MHz
■ 2 = 150 MHz
■ 3 = 156.25 MHz
Oscillator Control
Register 2 (OCR2)
Read / Write
Determines the U30 oscillator output frequency based on
the following options:
■ 0 = 100 MHz
■ 1 = 125 MHz
■ 2 = 150 MHz
■ 3 = 156.25 MHz
You cannot change OCR2 from the GUI.