CY7C68053Document # 001-06120 Rev *F Page 7 of 39
vertical columns of Figure3-5 . When operating in full-speed
BULK mode only the first 64 bytes of each buffer are used. For
example, in high-speed the maximum packet size is 512 bytes,
but in full-speed it is 64 bytes. Even though a buffer is
configured to be a 512 byte buffer, in full-speed only the first
64 bytes are used. The unused endpoint buffer space is not
available for other operations. An example endpoint configu-
ration is:
EP2–1024 double buffered; EP6–512 quad buffered
(column 8).
3.12.5 Default Full-Speed Alternate Settings
64
64
64
512
512
1024
1024
1024
1024
1024
1024
1024
512
512
512
512
512
512
512
512
512
512
EP2 EP2 EP2
EP6
EP6
EP8 EP8
EP0 IN&OUT
EP1 IN
EP1 OUT
Figure 3-5. Endpoint Configuration
1024
1024
EP6 1024
512
512
EP8
512
512
EP6
512
512
512
512
EP2
512
512
EP4
512
512
EP2
512
512
EP4
512
512
EP2
512
512
EP4
512
512
EP2
512
512
512
512
EP2
512
512
512
512
EP2
512
512
1024
EP2
1024
1024
EP2
1024
1024
EP2
1024
512
512
EP6
1024
1024
EP6
512
512
EP8
512
512
EP6
512
512
512
512
EP6
1024
1024
EP6
512
512
EP8
512
512
EP6
512
512
64
64
64
64
64
64
64
64
64
64
64
64
64
64
64
64
64
64
64
64
64
64
64
64
64
64
64
64
64
64
64
64
64
12345678910 11 12
Table 3-4. Default Full-Speed Alternate Settings[3, 4]
Alternate Setting 0 1 2 3
ep0 64 64 64 64
ep1out 0 64 bulk 64 int 64 int
ep1in 0 64 bulk 64 int 64 int
ep2 0 64 bulk out (2×) 64 int out (2×) 64 iso out (2×)
ep4 0 64 bulk out (2×) 64 bulk out (2×) 64 bulk out (2×)
ep6 0 64 bulk in (2×) 64 int in (2×) 64 iso in (2×)
ep8 0 64 bulk in (2×) 64 bulk in (2×) 64 bulk in (2×)
Notes
3. ‘0’ means ‘not implemented.’
4. ‘2×’ means ‘double buffered.’
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