Altera Cyclone III LS FPGA - Manual (Page 23)

Chapter 6: Board Test System 6–5
Using the Board Test System
© October 2009 Altera Corporation Cyclone III LS FPGA Development Kit User Guide
 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.
 PSR —Sets the MAX II PSR register. The numerical values in the list corresponds to
the page of flash memory to load during FPGA reconfiguration. Refer to Table 6–1
for more information.
 PSS —Displays the MAX II PSS register value. Refer to Table 6–1 for the list of
available options.
 OCR1 —Sets the MAX II OCR1 register. Refer to Table 6–1 for the list of available
options.
 SRST —Resets the system and reloads the FPGA with a design from flash memory
based on the other MAX II register values. Refer to Table 6–1 for more information.
1 Because the Config tab requires that a specific design is running in the FPGA, writing
a 0 to SRST or changing the PSO value can cause the Board Test System to stop
running.
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 two 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 PROGRAM LED
(D29-D31) based on the following encoding:
 0 = PROGRAM LED0 LED (D31) and corresponds to the
flash memory page for the factory hardware design
 1 = PROGRAM LED1 LED (D30) and corresponds to the
flash memory page for the user hardware 1 design
 2 = PROGRAM LED2 LED (D29) and corresponds to the
flash memory page for the user hardware 2 design
Oscillator Control
Register 1 (OCR1) Read / Write Determines the U17 oscillator output frequency based on
the following options:
 0 = 100 MHz
 1 = 125 MHz
 2 = 150 MHz
 3 = 156.25 MHz