EZ-USB FX3 Technical Reference Manual, Document Number: 001-76074 Rev. *F 141
General Programmable Interface II (GPIF II)
Table 7-4. GPIO mapping for Special Function signals
10. How many signals need to be monitored by GPIF II, and how many need to be driven by GPIF II? Also, how many
DMA flags do you need in your application?
Control pins can be configured as input signals that drive the GPIF II state machine, output signals that are driven by the
state machine, or flags that reflect the transfer readiness of various buffers on the FX3 device. You can configure any pins
that are unused by the GPIF II block as GPIOs that are controlled by the firmware application. As you add inputs or out-
puts, the state machine designer automatically adds them as choices to be tested (inputs) or asserted (outputs) in any
state.
7.6 GPIF II State Machine Implementation
The state machine canvas provides graphical controls to draw a GPIF II state machine diagram. A GPIF II state machine
consists of actions performed in each state and triggers that cause transitions from one state to another. The Action List
window displays the list of actions that can be added to states.
Click the State Machine tab to open the canvas. An unedited canvas has two states: START and STATE0. An unconditional
transition (LOGIC_ONE) connects the states as shown in the figure below.
Figure 7-21. GPIF II Designer Interface
The state machine canvas supports the following operations.
7.6.1 Add a State
A right-click anywhere on the canvas displays the State Machine menu. Select Add State to add a state to the canvas as
shown in the figure below.
Special Function GPIO
DLE/WE GPIO_18
OE GPIO_19
ALE GPIO_27
DACK GPIO_20
DRQ GPIO_21
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