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Нижегородский Государственный Технический Университет им. Р.Е. Алексеева

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usb_2.0_english

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<<< < Предыдущая 39 40 41 42 43 44 45 46 47 48 49 5051 / 6551 52 53 54 55 56 57 58 59 60 61 62 63 > Следующая >>>

Universal Serial Bus Specification Revision 2.0

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

Ready/data

ct1	CSPLIT
ct2	IN

Hub ignores this IN.

(no match the

address field.) TRANS_ERR

ce6->ce4

ct1	CSPLIT(retry imm.)
ct2	IN	Hub ignores this
		Hub ignores this

IN.

(no match the

address field.) TRANS_ERR

ce6->ce4

ct1	CSPLIT(retry imm.)
ct2	IN	Hub ignores this
		Hub ignores this

IN.

(no match the address field.)

TRANS_ERR

ce6->ce3

ENDPOINT HALT

FS/LS device

(data toggle) 0

DATA0

ACK

Figure A-31. Normal HS CSPLIT 3 Strikes Smash

473

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

Figure A-32. Normal HS DATA0/1 Smash

474

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

TRANS_ERR

ce6->ce4

CSPLIT(retry imm.)

ct1

		ct1
ct2	IN	ct2
		ct2

DATA0 cd1

TRANS_ERR

ce6->ce4

CSPLIT(retry imm.)

ct1

		ct1
ct2	IN	ct2
		ct2

DATA0 cd1

TRANS_ERR

ce6->ce3

ENDPOINT HALT

Figure A-33. Normal HS DATA0/1 3 Strikes Smash

475

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	TRANS_ERR
		ct1	TRANS_ERR
ct2	IN	ct2
		ct2
ch1	NYET	ch1
ch1

IN(local retry)

DATA0

Ready/data

ACK

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

Figure A-34. Normal FS/LS IN Smash

476

Universal Serial Bus Specification Revision 2.0

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

ct1	CSPLIT
ct1		ct1	TRANS_ERR
		ct1	TRANS_ERR
ct2	IN	ct2
		ct2
ch1	NYET	ch1	IN(local retry)
ch1

TRANS_ERR

IN(local retry)

			TRANS_ERR
			3TIMES TRANS_ERR
			Ready/stall
ct1	CSPLIT(retry)
ct1		ct1
		ct1
ct2	IN	ct2
		ct2
ch3	STALL	ch3	Old/stall
ch3

ENDPOINT HALT

Figure A-35. Normal FS/LS IN 3 Strikes Smash

FS/LS device

(data toggle) 0

477

Host

(data toggle)

st1

st2

sh1

ct1

ct2

ch1

ct1

ct2

ch5

Universal Serial Bus Specification Revision 2.0

Hub

(status)

		Old/x
SSPLIT	st1
	st1
IN	st2
	st2
ACK	sh1	Pending/x

CSPLIT

ct1

ct2

NYET ch1

Ready/data

CSPLIT(retry)

ct1

ct2

DATA0

cd1

Old/data

FS/LS device

(data toggle) 0

DATA0

TRANS_ERR

IN(local retry)

DATA0

ACK

Figure A-36. Normal FS/LS DATA0/1 Smash

478

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
				IN
				DATA0
				TRANS_ERR
ct1	CSPLIT			TRANS_ERR
ct1		ct1		TRANS_ERR
		ct1
ct2	IN	ct2
		ct2		IN(local retry)
				IN(local retry)
ch1	NYET	ch1
ch1				DATA0
				DATA0
				TRANS_ERR
				TRANS_ERR
				IN(local retry)
				DATA0
				TRANS_ERR
			Ready/stall	3TIMES TRANS_ERR
ct1	CSPLIT(retry)			TRANS_ERR
ct1		ct1
		ct1
ct2	IN	ct2
		ct2
ch3	STALL	ch3	Old/stall
ch3

ENDPOINT HALT

Figure A-37. Normal FS/LS DATA0/1 3 Strikes Smash

479

Universal Serial Bus Specification Revision 2.0

Host

(data toggle)

st1

st2

sh1

ct1

ct2

ch5

st1

st2

sh1

ct1

ct2

ch4

Host does not receive this data. Data toggle is still ‘1’.

Hub

(status)

		Old/x
SSPLIT	st1
	st1
IN	st2
	st2
ACK	sh1	Pending/x

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

SSPLIT	st1
	st1
IN	st2
	st2
ACK	sh1	Pending/x

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

Figure A-38. Normal FS/LS ACK Smash

FS/LS device

(data toggle) 0

DATA0

ACK

TRANS_ERR

DATA0

ACK

480

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
	SSPLIT		available
st1	SSPLIT
st1		st1
		st1
st2	IN	st2
		st2
sh3	NAK	sh3
sh3
				Time passes and some other
			Old/x	transaction frees buffer
st1	SSPLIT(retry)
st1		st1
		st1
st2	IN	st2
		st2
sh1	ACK	sh1	Pending/x
sh1

DATA0

Ready/data

ACK

ct1	CSPLIT	ct1
		ct1
ct2	IN	ct2
		ct2
ch5	DATA0	cd1	Old/data
ch5

Figure A-39. No Buffer Available No Smash(HS NAK(S))

481

Universal Serial Bus Specification Revision 2.0

Host

(data toggle)

st1	SSPLIT	st1
		st1
st2	IN	st2
		st2
	NAK	sh3
TRANS_ERR
se4->se2
st1	SSPLIT(retry)
st1		st1
		st1
st2	IN	st2
		st2
sh3	NAK	sh3
sh3

st1	SSPLIT(retry)
		st1

st2	IN	st2

sh1	ACK	sh1

ct1	CSPLIT	ct1
		ct1
ct2	IN	ct2
		ct2
ch5	DATA0	cd1
ch5

Hub

(status)

No buffers available

Old/x

Pending/x

Ready/data

Old/data

FS/LS device

(data toggle) 0

Time passes and some other transaction frees buffer

DATA0

ACK

Figure A-40. No Buffer Available HS NAK(S) Smash

482

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