CY7C64713
USB-Interrupt Autovectors
The main USB interrupt is shared by 27 interrupt sources. The
FX1 provides a second level of interrupt vectoring, called
Autovectoring, to save code and processing time that is normally
required to identify the individual USB interrupt source. When a
USB interrupt is asserted, the FX1 pushes the program counter
on to its stack and then jumps to address 0x0043, where it
expects to find a “jump” instruction to the USB Interrupt service
routine.
The FX1 jump instruction is encoded as shown in
If Autovectoring is enabled (AV2EN = 1 in the INTSETUP
register), the FX1 substitutes its INT2VEC byte. Therefore, if the
Table 3. INT2 USB Interrupts
high byte (“page”) of a jump table address is preloaded at
location 0x0044, the automatically inserted INT2VEC byte at
0x0045 directs the jump to the correct address out of the 27
addresses within the page.
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, such
as the USB Interrupt, can employ autovectoring.
interrupt sources.
USB INTERRUPT TABLE FOR INT2
Priority
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
INT2VEC Value
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
EP2ISOERR
EP4ISOERR
EP6ISOERR
EP8ISOERR
Reserved
Reserved
ISO EP2 OUT PID sequence error
ISO EP4 OUT PID sequence error
ISO EP6 OUT PID sequence error
ISO EP8 OUT PID sequence error
Page 5 of 54
EP0PING
EP1PING
EP2PING
EP4PING
EP6PING
EP8PING
ERRLIMIT
EP0-IN
EP0-OUT
EP1-IN
EP1-OUT
EP2
EP4
EP6
EP8
IBN
EP0ACK
SUDAV
SOF
SUTOK
SUSPEND
USB RESET
Source
Setup Data Available
Start of Frame
Setup Token Received
USB Suspend request
Bus reset
Reserved
FX1 ACK’d the CONTROL Handshake
Reserved
EP0-IN ready to be loaded with data
EP0-OUT has USB data
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
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
Notes
Document #: 38-08039 Rev. *E
CYPRESS [ CYPRESS SEMICONDUCTOR ]
