Cypress CY7C68013A manual Endpoint RAM, Size × 64 bytes Endpoints 0 × 512 bytes, Organization

CY7C68013A, CY7C68014A CY7C68015A, CY7C68016A

3.12 Endpoint RAM

3.12.1 Size
■ 3× 64 bytes	(Endpoints 0 and 1)
■ 8 × 512 bytes	(Endpoints 2, 4, 6, 8)

3.12.2Organization

■ 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; EP2 and 6 can be either double, triple, or quad buffered. For high-speed endpoint configuration options, see Figure 5.

3.12.3 Setup Data Buffer

A separate 8 byte buffer at 0xE6B8-0xE6BF holds the setup 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 config- urations 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 configu- ration is the EP2–1024 double buffered; EP6–512 quad buffered (column 8).

				Figure 5. Endpoint Configuration
EP0 IN&OUT	64	64	64	64	64	64	64	64	64	64	64	64
EP1 IN	64	64	64	64	64	64	64	64	64	64	64	64
EP1 OUT	64	64	64	64	64	64	64	64	64	64	64	64
	EP2	EP2	EP2	EP2	EP2	EP2	EP2	EP2	EP2	EP2	EP2	EP2
	512	512	512	512	512	512	1024	1024	1024	512
	512	512	512	512	512	512				512	1024
												1024
	EP4	EP4	EP4							512
	512	512	512	512	512	512	1024	1024	1024	EP6	1024	1024
	512	512	512	512	512	512				512
	EP6	EP6	EP6	EP6	EP6	EP6	EP6	EP6	EP6	512	1024
	512	512		512	512		512	512				1024
			1024			1024			1024	512	1024
	512	512		512	512		512	512
										EP8	EP8
	EP8			EP8			EP8					1024
	512	512	1024	512	512	1024	512	512	1024	512	512
										512	512
	512	512		512	512		512	512
	1	2	3	4	5	6	7	8	9	10	11	12

Document #: 38-08032 Rev. *L Page 10 of 62

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