Sundance SMT128 - Manual (Page 6)

Preliminary Page 6 of 15 SMT128 User Manual
Memory Map
There are four basic motherboard resources, Virtex internal registers, FLASH RAM,
EEPROM and UART. Each of these resources is explained in the following sections.
Register Global Address Description
FLASH Memory 0xA0000000 -> 0xA003FFFF FLASH Application/Boot space
EEPROM 0xA8000000 -> 0xA80000FF 8 –bit Non-volatile parameter storage
Virtex Registers 0xB0000000 -> 0xB0000007 See Description below
UART 1 0xB8000000 -> 0xB8000007 ModBus interface
UART 2 0xB8000008 -> 0xB800000F RS232 interface
Virtex Registers
Register Global Address Description
WDOG RST 0xB0000000 Writing to this register resets the watchdog
timer.
WDOG ENABLE 0xB0000001 Enables/Disables WDOG timer
DIGIN Register 0xB0000002 Read only, D0..D21 is state of digital I/P’s
DIGOUT Register 0xB0000003 Drives the digital O/P signals
VSTATUS 0xB0000004 Virtex Status Register
VCNTRL 0xB0000005 Virtex Control Register
WDOG RST
When the Watchdog timer is enabled (See WDOG ENABLE). This register must be
written to with a period of less than 1.6 seconds. If the register is not written to within
this period a global reset is initiated and the FAULT LED is activated. The fault LED
goes out next time the WDOG RST register is written to.
WDOG ENABLE
When writing to this register the level of the data line D0 selects either an internal
oscillator or a WDOG RST signal for the watchdog timer.
D0 -> logic 0 = Watchdog is reset using an internal oscillator.