CY7C68015A-56LFXC datasheet(10/55 Pages) CYPRESS

Part #	CY7C68015A-56LFXC

Description	EZ-USB FX2LP USB Microcontroller

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Manufacturer	CYPRESS [Cypress Semiconductor]

Direct Link	http://www.cypress.com

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10 / 55 page

CY7C68013A/CY7C68014A

CY7C68015A/CY7C68016A

Document #: 38-08032 Rev. *G

Page 10 of 55

3.12

Endpoint RAM

3.12.1

Size

• 3× 64 bytes

(Endpoints 0 and 1)

• 8 × 512 bytes (Endpoints 2, 4, 6, 8)

3.12.2

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 end-

point configuration options, see Figure 3-5.

3.12.3

Set-up Data Buffer

A separate 8-byte buffer at 0xE6B8-0xE6BF holds the Set-up

data from a CONTROL transfer.

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 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

(column 8).

64

512

1024

512

EP2

EP6

EP8

EP0 IN&OUT

EP1 IN

EP1 OUT

Figure 3-5. 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

64

12

3

4

5

6

7

8

9

10

11

12

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