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Chapter 4. Interrupts Page 4-19

4.7 FIFO/GPIF Interrupt (INT4)

Just as the USB Interrupt is shared among 27 individual USB-interrupt sources, the FIFO/GPIF

interrupt is shared among 14 individual FIFO/GPIF sources.

The FIFO/GPIF Interrupt, like the USB Interrupt, can employ autovectoring. Table 4-14 shows the

priority and INT4VEC values for the 14 FIFO/GPIF interrupt sources.

When FIFO/GPIF interrupt sources are asserted, the FX2 prioritizes them and constructs an

Autovector, which appears in the INT4VEC register; 0 is the highest priority, 14 is the lowest. If two

FIFO/GPIF interrupts occur simultaneously, the prioritization affects which one is first indicated in

the INT4VEC register. If Autovectoring is enabled, the INT4VEC byte replaces the contents of

address 0x0055 in the FX2’s program memory. This causes the FX2 to automatically vector to a

different address for each FIFO/GPIF interrupt source. This mechanism is explained in detail in

Section 4.8 "FIFO/GPIF-Interrupt Autovectors".

Table 4-14. Individual FIFO/GPIF Interrupt Sources

Priority

INT4VEC

Value

Source Notes

1 80 EP2PF Endpoint 2 Programmable Flag

2 84 EP4PF Endpoint 4 Programmable Flag

3 88 EP6PF Endpoint 6 Programmable Flag

4 8C EP8PF Endpoint 8 Programmable Flag

5 90 EP2EF Endpoint 2 Empty Flag

6 94 EP4EF Endpoint 4 Empty Flag

7 98 EP6EF Endpoint 6 Empty Flag

8 9C EP8EF Endpoint 8 Empty Flag

9 A0 EP2FF Endpoint 2 Full Flag

10 A4 EP4FF Endpoint 4 Full Flag

11 A8 EP6FF Endpoint 6 Full Flag

12 AC EP8FF Endpoint 8 Full Flag

13 B0 GPIFDONE GPIF Operation Complete

(See

Chapter 10, "General Programmable

Interface (GPIF)")

14 B4 GPIFWF GPIF Waveform

(See Chapter 10, "General Programmable

Interface (GPIF)"

)

1 2 ... 104 105 106 107 108 109 110 111 112 113 114 ... 459 460

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