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CY7C68053

Document # 001-06120 Rev *I

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3.12.4 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 one of the 12 configurations shown in the vertical columns

of Figure 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 configuration is:

EP2–1024 double buffered; EP6–512 quad buffered (column 8).

3.12.5 Default Full Speed Alternate Settings

512

1024

512

EP2

EP6

EP8

EP0 IN&OUT

EP1 IN

EP1 OUT

Figure 5. Endpoint Configuration

1024

EP6

1024

512

EP8

512

EP6

512

EP2

512

EP4

512

EP2

512

EP4

512

EP2

512

EP4

512

EP2

512

EP2

512

EP2

512

1024

EP2

1024

EP2

1024

EP2

1024

512

EP6

1024

EP6

512

EP8

512

EP6

512

EP6

1024

EP6

512

EP8

512

EP6

512

Table 4. Default Full Speed Alternate Settings[3, 4]

Alternate Setting

ep0

ep1out

64 bulk

64 int

ep1in

64 bulk

64 int

ep2

64 bulk out (2×)

64 int out (2×)

64 iso out (2×)

ep4

64 bulk out (2×)

ep6

64 bulk in (2×)

64 int in (2×)

64 iso in (2×)

ep8

64 bulk in (2×)

Notes

3. ‘0’ means ‘not implemented.’

4. ‘2×’ means ‘double buffered.’

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