CY7C68013A, CY7C68014A
CY7C68015A, CY7C68016A
3.12.3 Setup Data Buffer
3.12 Endpoint RAM
A separate 8 byte buffer at 0xE6B8-0xE6BF holds the setup data
from a CONTROL transfer.
3.12.1 Size
■
■
3× 64 bytes
(Endpoints 0 and 1)
3.12.4 Endpoint Configurations (High Speed Mode)
8 × 512 bytes (Endpoints 2, 4, 6, 8)
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.
3.12.2 Organization
■
■
■
■
■
■
EP0
The endpoint buffers can be configured in any 1 of the 12
configurations shown in the vertical columns. When operating in
the 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 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 the
EP2–1024 double buffered; EP6–512 quad buffered (column 8).
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; EP2 and 6 can be either double,
triple, or quad buffered. For high speed endpoint configuration
options, see Figure 5.
Figure 5. Endpoint Configuration
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
64
64
64
EP0 IN&OUT
EP1 IN
EP1 OUT
EP2
512
EP2
EP2
EP2 EP2
EP2 EP2
EP2
512
EP2
EP2
512
EP2
EP2
512
512
512
512
512
512
512
1024
1024
1024
1024
512
512
512
512
512
1024
EP4
512
EP4 EP4
512
512
512
512
512
512
512
512
EP6
1024
1024
1024
1024
1024
512
512
512
512
EP6
512
EP6
512
EP6
EP6
512
EP6
EP6
512
EP6
EP6 EP6
512
512
1024
1024 1024
512
512
1024
1024
1024
512
512
512
512
512
512
EP8
512
EP8
512
EP8
512
EP8
512
EP8
512
1024
512
512
512
512
512
512
1024
1024
1024
512
512
512
512
512
10
11
12
9
4
5
8
1
2
3
6
7
Document #: 38-08032 Rev. *N
Page 10 of 62
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