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Нижегородский Государственный Технический Университет им. Р.Е. Алексеева

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[НЕСОРТИРОВАННОЕ]

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usb_2.0_english

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Universal Serial Bus Specification Revision 2.0

Host		Hub	FS/LS
(data toggle)		(status)	device
		No buffers	(data toggle)
0		No buffers	0
0		available	0
		available
st1	SSPLIT	st1
		st1
st2	IN	st2
		st2
	NAK	sh3
TRANS_ERR
se4->se2
st1	SSPLIT(retry)
st1		st1
		st1
st2	IN	st2
		st2
	NAK	sh3
TRANS_ERR
se4->se2
st1	SSPLIT(retry)
st1		st1
		st1
st2	IN	st2
		st2

NAK sh3

TRANS_ERR

se4->se3

ENDPOINT HALT

Figure A-41. No Buffer Available HS NAK(S) 3 Strikes Smash

483

Universal Serial Bus Specification Revision 2.0

Host

(data toggle)

st1

st2

sh1

ct1

ct2

ch1

ct1

ct2

ch5

		Hub	FS/LS
		(status)	device
			(data toggle)
		Old/x	0
SSPLIT	st1
	st1
IN	st2
	st2
ACK	sh1	Pending/x

CSPLIT

ct1

ct2

NYET ch1

DATA0

Ready/data

ACK

CSPLIT(retry) ct1

ct2

DATA0

cd1

Old/data

Figure A-42. CS Earlier No Smash(HS NYET)

484

Universal Serial Bus Specification Revision 2.0

Host			Hub	FS/LS
(data toggle)			(status)	device
				(data toggle)
0			Old/x	0
st1	SSPLIT	st1
		st1
st2	IN	st2
		st2
sh1	ACK	sh1	Pending/x
sh1

ct1	CSPLIT
ct1		ct1
		ct1
ct2	IN	ct2
		ct2
	NYET	ch1		IN
				IN
TRANS_ERR				DATA0
ce6->ce4
			Ready/data	ACK
	CSPLIT(retry imm.)			1
ct1	CSPLIT(retry imm.)
ct1		ct1
		ct1
ct2	IN	ct2
		ct2
ch5	DATA0	cd1	Old/data
ch5

Figure A-43. CS Earlier HS NYET Smash(case 1)

485

Universal Serial Bus Specification Revision 2.0

Host			Hub	FS/LS
(data toggle)			(status)	device
				(data toggle)
0			Old/x	0
st1	SSPLIT	st1
		st1
st2	IN	st2
		st2
sh1	ACK	sh1	Pending/x
sh1

ct1	CSPLIT	ct1
		ct1
ct2	IN	ct2
		ct2
	NYET	ch1
TRANS_ERR
ce6->ce4
ct1	CSPLIT(retry imm.)
ct1		ct1
		ct1
ct2	IN	ct2
		ct2
		IN
ch1	NYET	ch1
ch1

DATA0

Ready/data

ACK

ct1	CSPLIT(retry)
ct1		ct1
		ct1
ct2	IN	ct2
		ct2
ch5	DATA0	cd1	Old/data
ch5

Figure A-44. CS Earlier HS NYET Smash(case 2)

486

Host

(data toggle)

st1

st2

sh1

ct1

ct2

ch2

st1

st2

sh1

ct1

ct2

ch5

Universal Serial Bus Specification Revision 2.0

		Hub	FS/LS
		(status)	device
			(data toggle)
		Old/x	0
SSPLIT	st1
	st1
IN	st2
	st2
ACK	sh1	Pending/x

NAK

CSPLIT		Ready/nak
	ct1
IN	ct2
	ct2
NAK	ch2	Old/nak

SSPLIT(retry)

st1

IN	st2
	st2
ACK	sh1	Pending/x

		IN
		DATA0
CSPLIT		Ready/data
	ct1	ACK
	ct1
IN	ct2	1
	ct2
DATA0	cd1	Old/data

Figure A-45. Device Busy No Smash(FS/LS NAK)

487

Universal Serial Bus Specification Revision 2.0

Host			Hub	FS/LS
(data toggle)			(status)	device
				(data toggle)
0			Old/x	0
st1	SSPLIT	st1
		st1
st2	IN	st2
		st2
sh1	ACK	sh1	Pending/x
sh1

STALL

			Ready/stall
ct1	CSPLIT	ct1
		ct1
ct2	IN	ct2
		ct2
ch3	STALL	ch3	Old/stall
ch3

ENDPOINT HALT

Figure A-46. Device Stall No Smash(FS/LS STALL)

488

Universal Serial Bus Specification Revision 2.0

A.3 Interrupt OUT Transaction Examples

Legend:

(S): Start Split

(C): Complete Split

Summary of cases for Interrupt OUT transaction

•Normal cases

Case

No smash

(FS/LS handshake packet is done by M+1)

HS SSPLIT smash

HS SSPLIT 3 strikes smash

HS OUT(S) smash

HS OUT(S) 3 strikes smash

HS DATA0/1 smash

HS DATA0/1 3 strikes smash

HS CSPLIT smash

HS CSPLIT 3 strikes smash

HS OUT(C) smash

HS OUT(C) 3 strikes smash

HS ACK(C) smash

HS ACK(C) 3 strikes smash

FS/LS OUT smash

FS/LS OUT 3 strikes smash

FS/LS DATA0/1 smash

FS/LS DATA0/1 3 strikes smash

FS/LS ACK smash

Reference

Figure

Figure A-47

No figure

Figure A-48

No figure

Figure A-49

Figure A-50

Figure A-51

Figure A-52

No figure

Figure A-53

No figure

Figure A-54

Similar Figure

Figure A-48

Figure A-49

Figure A-50

Figure A-53

489

Universal Serial Bus Specification Revision 2.0

FS/LS ACK 3 strikes smash	No figure

• Searcing

	Case	Reference	Similar Figure
		Figure

	No smash	Figure A-55

•CS(Complete-split transaction) earlier cases

Case	Reference	Similar Figure
	Figure

No smash (HS NYETand FS/LS handshake packet is done by M+2)

No smash(HS NYET and FS/LS handshake packet is done by M+3)

Figure A-56

Figure A-57

HS NYET smash	Figure A-58

HS NYET 3 strikes smash	Figure A-59

•Abort and Free cases

Case	Reference	Similar Figure
	Figure

No smash and abort (HS NYETand FS/LS transaction is continued at end of M+3)

No smash and free(HS NYETand FS/LS transaction is not started at end of M+3)

Figure A-60

Figure A-61

•FS/LS transaction error cases

Case	Reference	Similar Figure
	Figure

HS ERR smash		Figure A-51

HS ERR 3 strikes smash		Figure A-52

•Device busy cases

490

Universal Serial Bus Specification Revision 2.0

Case	Reference	Similar Figure
	Figure

No smash(HS NAK(C))	Figure A-62

HS NAK(C) smash		Figure A-51

HS NAK(C) 3 strikes smash		Figure A-52

FS/LS NAK smash		Figure A-53

FS/LS NAK 3 strikes smash	No figure

•Device stall cases

Case	Reference	Similar Figure
	Figure

No smash

HS STALL(C) smash

HS STALL(C) 3 strikes smash

FS/LS STALL smash

FS/LS STALL 3 strikes smash

Figure A-63

No figure

Figure A-51

Figure A-52

Figure A-53

491

Universal Serial Bus Specification Revision 2.0

Host

(data toggle)

	0
uFrame M	st1	SSPLIT	st1
			st1
	st2	OUT	st2
			st2
	sh1	DATA0	sd1
			sd1

Hub

(SS: start sp. status CS: comp. sp. status)

SS:Free/x

SS:Pending/x

FS/LS device

(data toggle) 0

uFrame M+1

				CS:Ready/ack
uFrame M+2	ct1	CSPLIT	ct1
			ct1
	ct2	OUT	ct2
			ct2
		ACK	ch2	CS:Old/ack
	ch2	ACK	ch2
	ch2
1
uFrame M+3	Host does not issue 2nd CSPLIT,			CS:Free/x
	because host already receives ACK
	on previous microframe.

OUT

DATA0

ACK

uFrame M+4 Host does not issue 3rd CSPLIT,	SS:Free/x
because host already receives ACK
on previous microframe.

uFrame M+5

Figure A-47. Normal No Smash(FS/LS Handshake Packet is Done by M+1)

492

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