CY7C68053
Document # 001-06120 Rev *F Page 4 of 39
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 FX2LP18 jump instruction is encoded as shown in
Tabl e 3-2.
If Autovectoring is enabled (AV2EN = 1 in the INTSET-UP
register), the FX2LP18 substitutes its INT2VEC byte.
Therefore, if the 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.
Table 3-2. INT2 USB Interrupts
USB INTERRUPT TABLE FOR INT2
Priority INT2VEC Value Source Notes
1 00 SUDAV Set-up Data Available
2 04 SOF Start of Frame (or microframe)
3 08 SUTOK Set-up Token Received
4 0C SUSPEND USB Suspend request
5 10 USB RESET Bus reset
6 14 HISPEED Entered high-speed operation
7 18 EP0ACK FX2LP18 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
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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