5136-DNP-PCI
Hardware Reference
© 1999 SST/Woodhead Canada Limited
7
Bit Name
Description
Reserved
These bits are reserved for future use.
•
Writing 0000 has no effect.
•
These bits may read 1 or 0.
Applications should mask off and ignore these bits.
4.2.2 Card Configuration Register - CCR - Base A 2
Bit
7
6
5
4
3
2
1
0
Read/Write
R/W
R
R/W
R/W
R
R
R/W
R/W
Reset
0
0
0
0
0
0
Name
CardRun
WDT
FlashEn
Mode
Reserved
MCRSel
Bit Name
Description
MCRSel
These bits select which Memory Configuration Register is mapped into I/O space as
the MCR at Base A 3.
•
00
Selects
MCR0
•
01
Selects
MCR1
•
10
Selects
MCR2
•
11
Selects
MCR3
Reserved
These bits are reserved for future expansion.
Always write 00 to these bits.
Mode
This bit controls and indicates the current mode of operation.
•
When this bit is 1, the Pro Mode register set is selected
•
When this bit is 0, the Compatibility Mode register set is selected.
FlashEn
This bit controls and indicates whether or not the card will boot from the on-board
Flash memory.
•
When this bit is 1, the card is set to boot from Flash RAM.
•
When this bit is 0, the card is set to boot from Static RAM.
WDT
This bit indicates the state of the watchdog timer.
•
When this bit is 1, the watchdog has timed out, and the card is NOT running.
You must stop and re-start the card to start it running again. If this has
occurred, the card’s HealthLED will be RED.
•
When this bit is 0, the watchdog has not timed out.
CardRun
This bit controls and indicates whether or not the card’s processor is running. It also
affects the card’s Health LED.
•
When this bit is 0, the processor is halted, and the LED is RED.
•
When this bit is 1, the processor is running normally, and the LED is GREEN.
•
When this bit is 1, and watchdog has timed out, processor is halted, and the
LED is RED.
This bit must remain low for at least 50
µ
s to guarantee proper reset.
4.2.3 Memory Configuration Registers MCR 0 - 3 - Base A 3
Bit
7
6
5
4
3
2
1
0
Name
The four MCR registers are mapped into Base A 3, according the MCRSel bits in
the Card Configuration Register (CCR).
StockCheck.com
