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Нижегородский Государственный Технический Университет им. Р.Е. Алексеева

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[НЕСОРТИРОВАННОЕ]

Файл:

usb_2.0_english

.pdf

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03.05.2015

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Universal Serial Bus Specification Revision 2.0

1) Normal. Payload <= 188 bytes:

			Full-speed
Host		HUB	device
Host		SS: start-split buffer status	(toggle)
(toggle)		CS: complete-split buffer status: not needed
0	st1 SSPLIT-all	SS: Free	0
	st5
uFrame M	OUT
	sd1
	DATA0	sh1
		sh1
		SS: Pending
uFrame M + 1		OUT
uFrame M + 1		DATA0
		DATA0
			0
		SS: Free
uFrame M + 2

uFrame M + 8

uFrame M + 8 +1

533

Universal Serial Bus Specification Revision 2.0

2) Normal. Payload > 188 Bytes

Host

(toggle)

0	st2	SSPLIT-begin
uFrame M	st5	OUT
uFrame M		OUT
	sd1	DATA0
		sh1
uFrame M + 1	st3	SSPLIT-mid
uFrame M + 1
	st5	OUT
		OUT
	sd1	DATA0
		sh1
	st3	SSPLIT-mid
	st5	OUT
		OUT
	sd1	DATA0
uFrame M + 2		sh1
uFrame M + 2
	st4	SSPLIT-end
uFrame M + 3	st5	OUT
uFrame M + 3		OUT
	sd1	DATA0
		sh1

	Full-speed
HUB	device
SS: start-split buffer status	(toggle)
CS: complete-split buffer status: not needed
SS: Free	0

Create SS[0] entry with status= Pending

OUT

DATA0

Create SS[1] with status = Pending

SS[0]: Free

Create SS[2] with status = Pending

SS(1): Free

Create SS(3) with status = Pending

SS(2): Free

SS(3): Free

534

Universal Serial Bus Specification Revision 2.0

3)HS SSPLIT-all corrupted (missing or CRC error etc.) HS OUT corrupted

Host

(toggle)

uFrame M

uFrame M + 1

uFrame M + 2

uFrame N + 8

st1 SSPLIT-all

st5

OUT sd1 DATA0

st1 SSPLIT-all

OUT

sd1

DATA0

	Full-speed
HUB	device
SS: start-split buffer status	(toggle)
CS: complete-split buffer status: not needed
SS: Free	0
Trans_err
se1
OUT token and
DATA0 packets ignored
SS: Free

SS: Free

st1

HS handler TIMEOUT se1 DATA0 packet ignored

SS: Free

uFrame N + 8 + 1

535

Universal Serial Bus Specification Revision 2.0

4) HS DATA0 corrupted

			Full-speed
Host		HUB	device
Host		SS: start-split buffer status	(toggle)
(toggle)		CS: complete-split buffer status: not needed
0	st1 SSPLIT-all	SS: Free	0
	st5
uFrame M	OUT
	sd1
	DATA0 CRC error se2	SS: Free
		Ignore SS
uFrame M + 1
			0
uFrame M + 2

536

Universal Serial Bus Specification Revision 2.0

5) HS SSPLIT-begin corrupted (missing or CRC error etc.)

Host

(toggle)

0	st2	SSPLIT-begin
uFrame M	st5	OUT
uFrame M		OUT

sd1

DATA0

	Full-speed
HUB	device
SS: start-split buffer status	(toggle)
CS: complete-split buffer status: not needed
SS: Free	0
Trans_err
OUT token and
DATA0 packet ignored
No SS entry created

st3	SSPLIT-mid
uFrame M + 1
st5	OUT
	OUT
sd1	DATA0
	DATA0
	sh1
st3	SSPLIT-mid
st5	OUT
	OUT
sd1	DATA0
uFrame M + 2	sh1
uFrame M + 2
st4	SSPLIT-end
st5	OUT
uFrame M + 3	OUT
sd1	DATA0
	DATA0
	sh1

SSPLIT-mid, OUT, and DATA0 packet ignored

No SS entry created

SSPLIT-mid, OUT, and DATA0 packet ignored

No SS entry created

SSPLIT-end, OUT, and DATA0 packet ignored

No SS entry created

537

Universal Serial Bus Specification Revision 2.0

6) HS OUT after the HS SSPLIT-begin is corrupted

				Full-speed
Host			HUB	device
Host			SS: start-split buffer status	(toggle)
(toggle)			CS: complete-split buffer status: not needed
0	st2	SSPLIT-begin	SS: Free	0
uFrame M	st5	OUT	Trans_err se1
uFrame M		OUT	Trans_err se1
	sd1	DATA0	se1
			se1
			DATA0 packet ignored
			No SS entry created

st3	SSPLIT-mid
uFrame M + 1
st5	OUT
	OUT
sd1	DATA0
	sh1
st3	SSPLIT-mid
st5	OUT
	OUT
sd1	DATA0
uFrame M + 2	sh1
uFrame M + 2
st4	SSPLIT-end
st5	OUT
uFrame M + 3	OUT
sd1	DATA0
	sh1

SSPLIT-mid, OUT, and DATA0 packet ignored

No SS entry created

SSPLIT-mid, OUT, and DATA0 packet ignored

No SS entry created

SSPLIT-end, OUT, and DATA0 packet ignored

No SS entry created

538

Universal Serial Bus Specification Revision 2.0

7) HS DATA0 corrupted

			Full-speed
Host		HUB	device
Host		SS: start-split buffer status	(toggle)
(toggle)		CS: complete-split buffer status: not needed
0	st2 SSPLIT-begin	SS: Free	0
	st5
uFrame M	OUT
	sd1	SSPLIT-begin and OUT token ignored
	DATA0 CRC error se2	No SS entry created

st3	SSPLIT-mid
uFrame M + 1
st5	OUT
	OUT
sd1	DATA0
	sh1
st3	SSPLIT-mid
st5	OUT
	OUT
sd1	DATA0
uFrame M + 2	sh1
uFrame M + 2
st4	SSPLIT-end
st5	OUT
uFrame M + 3	OUT
sd1	DATA0
	sh1

SSPLIT-mid, OUT, and DATA0 packet ignored

No SS entry created

SSPLIT-mid, OUT, and DATA0 packet ignored

No SS entry created

SSPLIT-end, OUT, and DATA0 packet ignored

No SS entry created

539

Universal Serial Bus Specification Revision 2.0

8) HS SSPLIT-mid or OUT token or DATA0 packet after it is corrupted

Host

(toggle)

uFrame M

uFrame M + 1

uFrame M + 2

uFrame M + 3

st2 SSPLIT-begin

st5

OUT

sd1 DATA0

sh1

st3 SSPLIT-mid

st5

OUT sd1 DATA0

st3 SSPLIT-mid

st5

OUT

sd1 DATA0

sh1

st4 SSPLIT-end

st5

OUT

sd1 DATA0

sh1

	Full-speed
HUB	device
SS: start-split buffer status	(toggle)
CS: complete-split buffer status: not needed
SS: Free	0

Create SS[0] entry with status = Pending

OUT

DATA0

OUT, and DATA0 packet ignored

No SS[1] entry created

At SOF, down_error recorded

SSPLIT-mid, OUT, and DATA0 packet ignored

No SS entry created

FS handler generates a bitstuffing error on full-speed bus

SSPLIT-mid, OUT, and DATA0	0
packet ignored

No SS entry created

540

Universal Serial Bus Specification Revision 2.0

A.6	Isochronous IN Split-transaction Examples

	Case	Reference
		Figure

	Normal: full-speed bus transaction does not cross microframe boundary	1

	Normal: full-speed bus transaction crosses microframe boundary	2

	HS SSPLIT corrupted	3

	IN after HS SSPLIT corrupted	4

	HS CSPLIT corrupted	5

	Consecutive HS CSPLIT corrupted	6

	HS IN corrupted	7

	Consecutive HS IN corrupted	8
	HS data corrupted (case 1)
	HS data corrupted (case 1)	9
	HS data corrupted (case 2)
	HS data corrupted (case 2)	10
	TT has more data than HS expects
	TT has more data than HS expects	11
	HS CS too early (full-speed data not available yet)
	HS CS too early (full-speed data not available yet)	12
	Full-speed timeout or CRC error
	Full-speed timeout or CRC error	13

541

Universal Serial Bus Specification Revision 2.0

1)Normal: full-speed bus transaction does not cross microframe boundary

Host		HUB
Host		SS: start-split buffer status
(toggle)		SS: start-split buffer status
(toggle)		CS: complete-split buffer status
0
	st1 SSPLIT	SS = Free
uFrame M	st2
	st2
	IN	Create SS entry with status = Pending
		Create SS entry with status = Pending
		IN
		Create CS entry
		SS = Free
uFrame M + 1		DATA0
uFrame M + 1		CS = Ready/last data
		CS = Ready/last data
ct1	CSPLIT
ct2	IN
uFrame M + 2		Send last data with
		Send last data with
	DATA0 cd1	DATA0
	DATA0 cd1
		CS = Old/last data
ch1
uFrame M + 3

Full-speed device

(toggle)

542

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