Cypress CY7C68053 manual Default Full-Speed Alternate Settings3

CY7C68053

vertical columns of Figure 3-5. 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 configu- ration is:

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

Figure 3-5. 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

3.12.5Default Full-Speed Alternate Settings

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

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×)
ep4	0	64 bulk out (2×)	64 bulk out (2×)	64 bulk out (2×)
ep6	0	64 bulk in (2×)	64 int in (2×)	64 iso in (2×)
ep8	0	64 bulk in (2×)	64 bulk in (2×)	64 bulk in (2×)

Notes

3.‘0’ means ‘not implemented.’

4.‘2×’ means ‘double buffered.’

Document # 001-06120 Rev *F Page 7 of 39

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