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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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<<< < Предыдущая 37 38 39 40 41 42 43 44 45 46 47 4849 / 6549 50 51 52 53 54 55 56 57 58 59 60 61 > Следующая >>>

Host

(data toggle)

st1

st2

sd1

sh1

ct1

ct2

ch1

ct1

ct2

ch3

Universal Serial Bus Specification Revision 2.0

Hub

(status)

Old/x

SSPLIT	st1
	st1
OUT/SETUPst2
DATA0	sd1
	sd1
ACK	sh1	Pending/x

CSPLIT

ct1

OUT/SETUPct2

NYET ch1

Ready/ack

CSPLIT(retry)

ct1

OUT/SETUPct2

Old/ack

ACK ch3

FS/LS device

(data toggle) 0

OUT/SETUP

DATA0

ACK

TRANS_ERR

OUT/SETUP(local retry)

DATA0

Device does ACK not receive

this data.

Data toggle is still ‘1’.

Figure A-13. Normal FS/LS ACK Smash

453

Host

(data toggle)

st1

st2

sd1

sh1

ct1

ct2

ch1

ct1

ct2

ch2

Universal Serial Bus Specification Revision 2.0

SSPLIT

st1

OUT/SETUPst2

DATA0

sd1

ACK sh1

CSPLIT

ct1

OUT/SETUPct2

NYET ch1

CSPLIT(retry)

ct1

OUT/SETUPct2

STALL ch2

Hub	FS/LS
(status)	device
	(data toggle)
Old/x	0

Pending/x

OUT/SETUP

DATA0

ACK

TRANS_ERR

OUT/SETUP(local retry)

DATA0

ACK

TRANS_ERR

OUT/SETUP(local retry)

DATA0

ACK

	TRANS_ERR
Ready/stall	3TIMES TRANS_ERR
Old/stall

ENDPOINT HALT

Figure A-14. Normal FS/LS ACK 3 Strikes Smash

454

Host

(data toggle)

st1

st2

sd1

sh3

st1

st2

sd1

sh1

ct1

ct2

ch3

Universal Serial Bus Specification Revision 2.0

Hub

(status)

No buffers available

SSPLIT

st1

OUT/SETUPst2

DATA0

sd1

NAK sh3

Old/x

SSPLIT(retry)

st1

OUT/SETUPst2
DATA0	sd1
	sd1
ACK	sh1	Pending/x

Ready/ack

CSPLIT

ct1

OUT/SETUPct2

Old/ack

ACK ch3

FS/LS device

(data toggle) 0

Time passes and some other transaction frees buffer

OUT/SETUP

DATA0

ACK

Figure A-15. No buffer Available No Smash (HS NAK(S))

455

Universal Serial Bus Specification Revision 2.0

Host			Hub	FS/LS
(data toggle)			(status)	device
				(data toggle)
0			No buffers	0
st1	SSPLIT		available
st1	SSPLIT	st1
		st1
st2	OUT/SETUPst2
	OUT/SETUPst2
sd1	DATA0	sd1
		sd1
	NAK	sh3
TRANS_ERR
se2->se4
st1	SSPLIT(retry)
st1		st1
		st1
st2	OUT/SETUPst2
	OUT/SETUPst2
sd1	DATA0	sd1
		sd1
sh3	NAK	sh3
sh3
				Time passes and some other
			Old/x	transaction frees buffer
			Old/x
st1	SSPLIT(retry)
st1		st1
		st1
st2	OUT/SETUPst2
	OUT/SETUPst2
sd1	DATA0	sd1
		sd1
sh1	ACK	sh1	Pending/x
sh1
				OUT/SETUP
				DATA0
				1
				ACK
			Ready/ack
ct1	CSPLIT	ct1
		ct1
ct2	OUT/SETUPct2
	OUT/SETUPct2
	ACK	ch3	Old/ack
ch3	ACK	ch3
ch3
1

Figure A-16. No Buffer Available HS NAK(S) Smash

456

Universal Serial Bus Specification Revision 2.0

Host		Hub	FS/LS
(data toggle)		(status)	device
			(data toggle)
0		No buffers	0
st1	SSPLIT	available
st1	SSPLIT	st1
		st1
st2	OUT/SETUPst2
	OUT/SETUPst2
sd1	DATA0	sd1
		sd1
	NAK	sh3

TRANS_ERR

se2->se4

SSPLIT(retry)

st1

st1 st2 OUT/SETUPst2

sd1 DATA0	sd1

NAK sh3

TRANS_ERR

se2->se4

SSPLIT(retry)

st1

st1 st2 OUT/SETUPst2

sd1 DATA0	sd1

NAK sh3

TRANS_ERR

se2->se5

ENDPOINT HALT

Figure A-17. No Buffer Available HS NAK(S) 3 Strikes Smash

457

Host

(data toggle)

st1

st2

sd1

sh1

ct1

ct2

ch1

ct1

ct2

ch3

Universal Serial Bus Specification Revision 2.0

		Hub	FS/LS
		(status)	device
			(data toggle)
		Old/x	0
SSPLIT	st1
	st1
OUT/SETUPst2
DATA0	sd1
	sd1
ACK	sh1	Pending/x

CSPLIT	ct1

OUT/SETUPct2		OUT/SETUP
NYET	ch1	DATA0

ACK

Ready/ack

CSPLIT

ct1

OUT/SETUPct2

Old/ack

ACK ch3

Figure A-18. CS Earlier No Smash (HS NYET)

458

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	OUT/SETUPst2
	OUT/SETUPst2
sd1	DATA0	sd1
		sd1
sh1	ACK	sh1	Pending/x
sh1

ct1	CSPLIT	ct1
		ct1
ct2	OUT/SETUPct2		OUT/SETUP
	OUT/SETUPct2		OUT/SETUP
	NYET	ch1	DATA0
	NYET	ch1
			1
			ACK
TRANS_ERR			Ready/ack
ce2->ce3

CSPLIT(retry imm.)

ct1

ct1 ct2 OUT/SETUPct2

	ACK	Old/ack
ch3	ACK	ch3
ch3

Figure A-19. CS Earlier HS NYET Smash(case 1)

459

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	OUT/SETUPst2
	OUT/SETUPst2
sd1	DATA0	sd1
		sd1
sh1	ACK	sh1	Pending/x
sh1

ct1	CSPLIT	ct1
		ct1
ct2	OUT/SETUPct2
	OUT/SETUPct2
	NYET	ch1
TRANS_ERR
ce2->ce3
ct1	CSPLIT(retry imm.)
ct1		ct1
		ct1
ct2	OUT/SETUPct2
	OUT/SETUPct2
		OUT/SETUP
ch1	NYET	ch1
ch1		DATA0

ACK

Ready/ack

CSPLIT(retry)

ct1

ct1 ct2 OUT/SETUPct2

	ACK	Old/ack
ch3	ACK	ch3
ch3

Figure A-20. CS Earlier HS NYET Smash(case 2)

460

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	OUT/SETUPst2
	OUT/SETUPst2
sd1	DATA0	sd1
		sd1
sh1	ACK	sh1	Pending/x
sh1

ct1	CSPLIT	ct1
		ct1
ct2	OUT/SETUPct2
	OUT/SETUPct2
	NYET	ch1

TRANS_ERR

ce2->ce3

CSPLIT(retry imm.)

ct1

ct1 ct2 OUT/SETUPct2

NYET ch1

TRANS_ERR

ce2->ce3

CSPLIT(retry imm.)

ct1

ct1 ct2 OUT/SETUPct2

NYET ch1

TRANS_ERR

ce2->ce4

ENDPOINT HALT

Ready/ack

Buffer remains busy until Clear_TT_buffer request

OUT/SETUP

DATA0

ACK

Figure A-21. CS Earlier HS NYET 3 Strikes Smash

461

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	OUT	st2
		st2
sd1	DATA0	sd1
		sd1
sh1	ACK	sh1	Pending/x
sh1

OUT

DATA0

NAK

Ready/nak

ct1	CSPLIT	ct1
		ct1
ct2	OUT	ct2
		ct2
	NAK	Old/nak
ch4	NAK	ch4
ch4

st1	SSPLIT(retry)
		st1
st2	OUT	st2
		st2
sd1	DATA0	sd1
		sd1
sh1	ACK	sh1	Pending/x
sh1

OUT

DATA0

ACK

Ready/ack

ct1	CSPLIT	ct1
		ct1
ct2	OUT	ct2
		ct2
	ACK	Old/ack
ch3	ACK	ch3
ch3

Figure A-22. Device Busy No Smash(FS/LS NAK)

462

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