UALink Protocol Analyzer & Visualization Workstation

modeACC ↔ ACC

cmd

srcdstaddrlenvcpool

Packet Flow • ACC ↔ Switch ↔ ACC

tx=1284 rx=1281 replay=3 crc_err=0

DATA

CREDIT RETURN

CONTROL

AGGREGATE BANDWIDTHGB/s

680.9

AVG LATENCYns

CREDIT UTILIZATION%

Switch Fabric • Routing & Congestion4 switches • 256 ports

Waveform Viewer

cursor @ t=56ns • Δ=84ns • 1ns/div

time (ns)

100

110

ReqVldbit

ReqCmdbus

ATOM

MSG

ATOM

MSG

ATOM

MSG

ATOM

ReqTagbus

0xEB

0x3B

0xF5

0x27

0x67

0x72

0x05

0x16

0x12

0x69

0xE3

0x68

0x25

0xF1

ReqAddrbus

0xC7

0xAF

0xB2

0x04

0x65

0x2A

0xF9

0xBD

0xC8

0x31

0x4A

0x24

0x05

0x2B

0xE8

0x03

0xEC

0xE3

0x2D

0x99

0xE2

0x75

ReqVCbus

ReqPoolbus

ReqCreditVldbit

RdRspVldbit

RdRspTagbus

0xFE

0xD0

0xB8

0x78

0x5C

0x86

0x5F

0x6F

0x21

0x96

0x27

0xEE

0x68

0x97

RdRspStatusbus

ERR

Credit Flowlive

Request Credits84/128

Response Credits96/128

Pool Credits42/64

VC Credits22/32

Error Injection Laboratorystress the stack

Transaction Timeline40 events • live

UPLI TL DL PCS SWITCH

Time (ns)	Src	Dst	Layer	Type	Cmd	Tag	VC	Pool	Size	Latency	Status
12,043	ACC7	ACC1	SWITCH	WRITE	WR	0x01	3	3	128B	71.6ns	● OK
12,083	ACC9	ACC8	SWITCH	WRITE	WR	0x02	3	2	512B	184.5ns	● WARN
12,089	ACC1	ACC0	SWITCH	RESPONSE	RESP	0x03	2	1	128B	115ns	● WARN
12,109	ACC6	ACC3	PCS	RESPONSE	RESP	0x04	2	1	64B	29.8ns	● OK
12,151	ACC11	ACC3	DL	ATOMIC	ATOMIC_ADD	0x05	2	1	512B	192.3ns	● OK
12,189	ACC7	ACC8	DL	READ	RD	0x06	0	7	256B	158.5ns	● OK
12,212	ACC4	ACC8	SWITCH	MSG	MSG	0x07	2	6	640B	169.4ns	● OK
12,223	ACC2	ACC8	TL	READ	RD	0x08	1	2	512B	172.9ns	● OK
12,232	ACC10	ACC9	DL	ATOMIC	ATOMIC_ADD	0x09	3	1	128B	54.3ns	● WARN
12,246	ACC3	ACC6	DL	MSG	MSG	0x0A	0	1	512B	37.1ns	● OK
12,278	ACC5	ACC2	TL	READ	RD	0x0B	2	6	128B	161.4ns	● OK
12,321	ACC10	ACC3	SWITCH	READ	RD	0x0C	2	5	64B	131.7ns	● OK
12,327	ACC3	ACC6	SWITCH	MSG	MSG	0x0D	1	5	640B	22.3ns	● WARN
12,363	ACC1	ACC2	SWITCH	READ	RD	0x0E	0	6	512B	134.3ns	● OK
12,402	ACC0	ACC5	PCS	MSG	MSG	0x0F	2	7	640B	172.9ns	● OK
12,436	ACC3	ACC6	PCS	WRITE	WR	0x10	3	3	64B	60.5ns	● OK
12,461	ACC6	ACC5	DL	ATOMIC	ATOMIC_CAS	0x11	2	6	512B	37.7ns	● OK
12,481	ACC3	ACC8	DL	RESPONSE	RESP	0x12	3	5	64B	49.6ns	● OK
12,518	ACC0	ACC1	UPLI	ATOMIC	ATOMIC_CAS	0x13	0	2	640B	191.4ns	● OK
12,555	ACC10	ACC11	TL	RESPONSE	RESP	0x14	0	5	64B	81.5ns	● OK
12,590	ACC4	ACC5	TL	RESPONSE	RESP	0x15	0	3	256B	136.4ns	● OK
12,615	ACC1	ACC8	PCS	RESPONSE	RESP	0x16	0	7	64B	115.5ns	● OK
12,645	ACC1	ACC2	PCS	MSG	MSG	0x17	0	4	512B	59.8ns	● OK
12,687	ACC6	ACC5	TL	MSG	MSG	0x18	2	4	512B	114.5ns	● OK
12,710	ACC5	ACC10	PCS	READ	RD	0x19	1	0	64B	22.6ns	● OK
12,721	ACC9	ACC7	SWITCH	ATOMIC	ATOMIC_ADD	0x1A	1	4	128B	46.7ns	● OK
12,737	ACC7	ACC1	TL	ATOMIC	ATOMIC_ADD	0x1B	1	7	256B	39.7ns	● OK
12,744	ACC11	ACC1	DL	READ	RD	0x1C	3	1	256B	34.8ns	● OK
12,764	ACC4	ACC10	PCS	READ	RD	0x1D	3	0	512B	63.1ns	● OK
12,788	ACC0	ACC1	PCS	ATOMIC	ATOMIC_ADD	0x1E	0	3	64B	147.5ns	● WARN
12,805	ACC7	ACC10	UPLI	ATOMIC	ATOMIC_ADD	0x1F	0	6	640B	38.1ns	● OK
12,825	ACC6	ACC2	SWITCH	RESPONSE	RESP	0x20	2	6	512B	74.7ns	● OK
12,833	ACC10	ACC6	DL	ATOMIC	ATOMIC_ADD	0x21	0	3	640B	187.9ns	● OK
12,866	ACC11	ACC1	PCS	ATOMIC	ATOMIC_CAS	0x22	1	5	64B	68.9ns	● OK
12,887	ACC2	ACC10	UPLI	MSG	MSG	0x23	0	3	640B	53ns	● OK
12,927	ACC1	ACC3	UPLI	ATOMIC	ATOMIC_ADD	0x24	0	6	640B	97ns	● REPLAY
12,961	ACC5	ACC7	TL	ATOMIC	ATOMIC_CAS	0x25	0	5	256B	191.3ns	● OK
12,992	ACC4	ACC1	SWITCH	ATOMIC	ATOMIC_CAS	0x26	2	4	64B	151.1ns	● OK
13,002	ACC11	ACC6	PCS	READ	RD	0x27	2	2	256B	57.2ns	● OK
13,027	ACC10	ACC9	SWITCH	ATOMIC	ATOMIC_CAS	0x28	1	0	512B	34.2ns	● OK