CY7C68013
3.8
Interrupt System
3.8.1
INT2 Interrupt Request and Enable Registers
FX2 implements an autovector feature for INT2 and INT4. There are 27 INT2 (USB) vectors, and 14 INT4 (FIFO/GPIF) vectors.
See FX2 TRM for more details.
3.8.2
USB-Interrupt Autovectors
The main USB interrupt is shared by 27 interrupt sources. To save the code and processing time that normally would be required
to identify the individual USB interrupt source, the FX2 provides a second level of interrupt vectoring, called Autovectoring. When
a USB interrupt is asserted, the FX2 pushes the program counter onto its stack then jumps to address 0x0043, where it expects
to find a “jump” instruction to the USB Interrupt service routine.
The FX2 jump instruction is encoded as follows.
Table 3-3. INT2 USB Interrupts
USB INTERRUPT TABLE FOR INT2
Priority
1
INT2VEC Value Source
Notes
00
04
08
0C
10
14
18
1C
20
24
28
2C
30
34
38
3C
40
44
48
4C
50
54
58
5C
60
64
68
6C
70
74
78
7C
SUDAV
SETUP Data Available
2
SOF
Start of Frame (or microframe)
Setup Token Received
3
SUTOK
4
SUSPEND
USB RESET
HISPEED
EP0ACK
USB Suspend request
5
Bus reset
6
Entered high speed operation
FX2 ACK’d the CONTROL Handshake
reserved
7
8
9
EP0-IN
EP0-OUT
EP1-IN
EP1-OUT
EP2
EP0-IN ready to be loaded with data
EP0-OUT has USB data
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
EP1-IN ready to be loaded with data
EP1-OUT has USB data
IN: buffer available. OUT: buffer has data
IN: buffer available. OUT: buffer has data
IN: buffer available. OUT: buffer has data
IN: buffer available. OUT: buffer has data
IN-Bulk-NAK (any IN endpoint)
reserved
EP4
EP6
EP8
IBN
EP0PING
EP1PING
EP2PING
EP4PING
EP6PING
EP8PING
ERRLIMIT
EP0 OUT was Pinged and it NAK’d
EP1 OUT was Pinged and it NAK’d
EP2 OUT was Pinged and it NAK’d
EP4 OUT was Pinged and it NAK’d
EP6 OUT was Pinged and it NAK’d
EP8 OUT was Pinged and it NAK’d
Bus errors exceeded the programmed limit
reserved
reserved
reserved
EP2ISOERR
EP4ISOERR
EP6ISOERR
EP8ISOERR
ISO EP2 OUT PID sequence error
ISO EP4 OUT PID sequence error
ISO EP6 OUT PID sequence error
ISO EP8 OUT PID sequence error
Document #: 38-08012 Rev. *C
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