5-4
Themis Computer
TA64 Hardware Manual
Either of these actions will transfer the content of the Limit Register into the Counter
Register and will also enable the count-down process.
Once started, a watchdog counter cannot be stopped, unless it is reset or the count-
down process has reached zero.
5.4
X-Bus (ISA) Flash
The FPGA is responsible for controlling the access of the X-Bus (ISA) Flash device
through its LPC to ISA bridge function. The CPU accesses the ISA Flash via the
LPC interface of the AMD8111 chipset. This Flash can be used as a booting device,
which holds the BIOS of the TA64 system. It can also be used as a user Flash if not
as a booting device.
A jumper (JP11) of the TA64 is used to choose the booting device. When the ISA
Flash is chosen as the booting device, it will use address range FF00.0000 --
FFFF.FFFF. When the ISA Flash is chosen as the user Flash (therefore not a booting
device), it will use the address range FC00.0000 -- FCFF.FFFF.
To summarize:
• Boot Flash: FF00.0000 -- FFFF.FFFF
• User Flash: FC00.0000 -- FCFF.FFFF
5.5
Register Description
5.5.1
Summary
Figure 5-1
summarizes of all the registers implemented in the FPGA.
Table 5-1.
TA64 FPGA Register Address Map
Register Name
Size
Address
Description
FPGA revision
8 bit
0xFB00.0000
TA64 FPGA revision
ISR control
8 bit
0xFB00.0001
On-board ISR programming control
Boot path control
8 bit
0xFB00.0002
TA64
boot path control
Содержание TA64
Страница 3: ...iii Themis Computer TA64 Hardware Manual VersionRevisionHistory Version 1 0 May 2006...
Страница 4: ...iv Themis Computer TA64 Hardware Manual...
Страница 16: ...xvi Themis Computer TA64 Hardware Manual...
Страница 38: ...TA64 Hardware Manual 1 14 Themis Computer...
Страница 58: ...3 10 Themis Computer TA64 Hardware Manual...
Страница 78: ...4 20 Themis Computer TA64 Hardware Manual...
Страница 96: ...5 18 Themis Computer TA64 Hardware Manual...
Страница 124: ...A 28 Themis Computer TA64 Hardware Manual...
Страница 152: ...E 6 Themis Computer TA64 Hardware Manual...
Страница 156: ...Themis Computer TA64 Hardware Manual F 4...