CY7C68033/CY7C68034
Document #: 001-04247 Rev. *D Page 9 of 33
Endpoint RAM
Size
• 3 × 64 bytes (Endpoints 0 and 1)
• 8 × 512 bytes (Endpoints 2, 4, 6, 8)
Organization
• EP0
— Bidirectional endpoint zero, 64-byte buffer
• EP1IN, EP1OUT
— 64-byte buffers, bulk or interrupt
• EP2,4,6,8
— Eight 512-byte buffers, bulk, interrupt, or isochronous.
— EP4 and EP8 can be double buffered, while EP2 and 6
can be either double, triple, or quad buffered.
For high-speed endpoint configuration options, see Figure 8.
Setup Data Buffer
A separate 8-byte buffer at 0xE6B8-0xE6BF holds the setup
data from a CONTROL transfer.
Endpoint Configurations (High-speed Mode)
Endpoints 0 and 1 are the same for every configuration.
Endpoint 0 is the only CONTROL endpoint, and endpoint 1 can
be either BULK or INTERRUPT. The endpoint buffers can be
configured in any 1 of the 12 configurations shown in the
vertical columns. When operating in full-speed BULK mode,
only the first 64 bytes of each buffer are used. For example, in
high-speed the max 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 opera-
tions. An example endpoint configuration would be:
EP2–1024 double buffered; EP6–512 quad buffered
(column8 in Figure 8).
Figure 8. Endpoint Configuration
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
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 6. Default Full-Speed Alternate Settings[2, 3]
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×)
Notes
2. ‘0’ means ‘not implemented.’
3. ‘2×’ means ‘double buffered.’
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