
Chapter 4. Interrupts Page 4-9
4.4.2 USB Interrupts
Table 4-10 shows the 27 USB requests that share the USB Interrupt. Figur e4-1 shows the USB
Interrupt logic; the bottom IRQ, EP8ISOERR, is expanded in the diagram to show the logic which
is associated with each USB interrupt request.
Table 4-10. Individual USB Interrupt Sources
Priority
INT2VEC
Value
Source Notes
1 00 SUDAV SETUP Data Available
2 04 SOF Start of Frame (or microframe)
3 08 SUTOK Setup Token Received
4 0C SUSPEND USB Suspend request
5 10 USB RESET Bus reset
6 14 HISPEED Entered high speed operation
7 18 EP0ACK FX2 ACK’d the CONTROL Handshake
8 1C reserved
9 20 EP0-IN EP0-IN ready to be loaded with data
10 24 EP0-OUT EP0-OUT has USB data
11 28 EP1-IN EP1-IN ready to be loaded with data
12 2C EP1-OUT EP1-OUT has USB data
13 30 EP2 IN: buffer available. OUT: buffer has data
14 34 EP4 IN: buffer available. OUT: buffer has data
15 38 EP6 IN: buffer available. OUT: buffer has data
16 3C EP8 IN: buffer available. OUT: buffer has data
17 40 IBN IN-Bulk-NAK (any IN endpoint)
18 44 reserved
19 48 EP0PING EP0 OUT was Pinged and it NAK’d
20 4C EP1PING EP1 OUT was Pinged and it NAK’d
21 50 EP2PING EP2 OUT was Pinged and it NAK’d
22 54 EP4PING EP4 OUT was Pinged and it NAK’d
23 58 EP6PING EP6 OUT was Pinged and it NAK’d
24 5C EP8PING EP8 OUT was Pinged and it NAK’d
25 60 ERRLIMIT Bus errors exceeded the programmed limit
26 64 reserved
27 68 reserved
28 6C reserved
29 70 EP2ISOERR ISO EP2 OUT PID sequence error
30 74 EP4ISOERR ISO EP4 OUT PID sequence error
31 78 EP6ISOERR ISO EP6 OUT PID sequence error
32 7C EP8ISOERR ISO EP8 OUT PID sequence error
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