I/O Structures in IGLOO and ProASIC3 Devices
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v1.1
Table 7-10 Hot-Swap Level 3
Description
Hot-swap while bus idle
Power Applied to Device
Yes
Bus State
Held idle (no ongoing I/O processes during
insertion/removal)
Card Ground Connection
Reset must be maintained for 1 ms before,
during, and after insertion/removal.
Device Circuitry Connected to Bus Pins
Must remain glitch-free during power-up or
power-down
Example Application
Board bus shared with card bus is "frozen," and
there is no toggling activity on the bus. It is
critical that the logic states set on the bus signal
not be disturbed during card insertion/removal.
Compliance of IGLOO and ProASIC3 Devices
30 k gate devices, all IGLOOe/ProASIC3E devices:
Compliant with two levels of staging (first:
GND; second: all other pins)
Other IGLOO/ProASIC3 devices: Compliant:
Option A – Two levels of staging (first: GND;
second: all other pins) together with bus switch
on the I/Os
Option B – Three levels of staging (first: GND;
second: supplies; third: all other pins)
Table 7-11 Hot-Swap Level 4
Description
Hot-swap on an active bus
Power Applied to Device
Yes
Bus State
Bus may have active I/O processes ongoing, but
device being inserted or removed must be idle.
Card Ground Connection
Reset must be maintained for 1 ms before,
during, and after insertion/removal.
Device Circuitry Connected to Bus Pins
Must remain glitch-free during power-up or
power-down
Example Application
There is activity on the system bus, and it is
critical that the logic states set on the bus signal
not be disturbed during card insertion/removal.
Compliance of IGLOO and ProASIC3 Devices
30 k gate devices, all IGLOOe/ProASIC3E devices:
Compliant with two levels of staging (first:
GND; second: all other pins)
Other IGLOO/ProASIC3 devices: Compliant:
Option A – Two levels of staging (first: GND;
second: all other pins) together with bus switch
on the I/Os
Option B – Three levels of staging (first: GND;
second: supplies; third: all other pins)