3.6.3 Standby Mode
Following a soft-reset, the EZ-ICE board is in standby mode. This mode is
characterized by the rapidly blinking activity indicator on the pod cover.
When the EZ-ICE board is in standby mode, its microcontroller waits for
either:
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VisualDSP to send a character (through the RS-232 serial port) – this
causes the EZ-ICE board to enter emulator space.
or
The target to assert a valid low signal on the DSP’s /RESET or /BR
line – this causes the EZ-ICE board to enter transparent mode.
When the program starts communications over RS-232, a character
received event occurs on the EZ-ICE board. The EZ-ICE board checks
the state of its system reset state flag to see if the system was just initialized.
After producing the first connect acknowledge response, an EZ-ICE board
in standby mode evaluates the character it received. If the character is part
of a serial code sent by VisualDSP, then the EZ-ICE board transitions into
emulator space.
NOTE: An EZ-ICE board in standby mode does not execute any user
code on the DSP and does not produce any valid memory read or write
strobes to the target. All user breakpoints are invalid when the EZ-ICE
board enters standby mode.
3.6.4 Transparent Mode
Following the target’s assertion of a valid low signal on the DSP’s / RESET
line, the EZ-ICE board enters transparent mode. EZ-ICE board
transparent mode makes the EZ-ICE emulator transparent to the target (by
de-asserting emulation enable / EE ) -- as though only the DSP were there.
Transparent mode terminates when the EZ-ICE board receives a character
on the serial line (VisualDSP starts) or an EZ-ICE hardware reset occurs.
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