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TV80 Microprocessor Core Environment Documentation
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Environment Memory Map:
Environment memory space is divided into a 32k ROM region and a 32k RAM
region, as follows:
0000-7FFF: ROM
8000-FFFF: RAM
Environment I/O space is allocated as follows:
00-0F: Unused
10-1F: Test devices
20-7F: Unused
80-8F: Environment control
A0-FF: Unused
The Environment control registers are:
80 : Simulation control
Write '01' to end simulation with test passed
Write '02' to end with test failed
Write '03' to turn on dumping
Write '04' to turn off dumping
81 : Message output
Write characters to this port one at a time. When the
newline ('\n', ASCII 0x0A) character is written, the
environment will print out the collected string.
82 : Timeout control
Bit[0] enables the timeout counter
Bit[1] resets the counter to 0
Timeout counter defaults to enabled at simulation start
83 : Max timeout [low]
84 : Max timeout [high]
Holds 16-bit timeout value (amount of time in clocks before
timeout error occurs).
90 : Interrupt countdown
When set, starts a countdown (in clocks) until assertion of
the INT_N signal.
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