13
AT43USB324
1941A–02/01
DPx, DMx Hub Timings, Full Speed Operation
Symbol
Parameter
Min
Max
Unit
t
HDD2
Hub Differential Data Delay without Cable
44
ns
t
HDJ1
t
HDJ2
Hub Differential Driver Jitter
To Next Transition
For Paired Transitions
-3
-1
3
1
ns
t
FSOP
Data Bit Width Distortion after SOP
-5
5
ns
t
FEOPD
Hub EOP Delay Relative to t
HDD
0
15
ns
t
FHESK
Hub EOP Output Width Skew
-15
15
ns
DPx, DMx Hub Timings, Low Speed Operation
Symbol
Parameter
Min
Max
Unit
t
LHDD
Hub Differential Data Delay
300
ns
t
LHDJ1
t
LHDJ2
t
LUHJ1
t
LUHJ2
Downstream Hub Differential Driver Jitter
To Next Transition, Downstream
For Paired Transitions, Downstream
To Next Transition, Upstream for Paired Transitions, Upstream
-45
-15
-45
-45
45
15
45
45
ns
t
SOP
Data Bit Width Distortion after SOP
-60
60
ns
t
LEOPD
Hub EOP Delay Relative to t
HDD
0
200
ns
t
LHESK
Hub EOP Output Width Skew
-300
300
ns
Hub Event Timings
Symbol
Parameter
Condition
Min
Max
Unit
t
DCNN
Time to Detect a Downstream Port Connect Event
2.5
2000
µs
t
DDIS
Time to Detect a Disconnect Event on Downstream
Port Awake Hub Suspended Hub
2.5
2.5
2000
12000
µs
t
URSM
Time from Detecting Downstream Resume to
Rebroadcast
100
µs
t
DRST
Duration of Driving Reset to a Downstream Device
Only for a
SetPortFeature
(PORT_RESET)
Request
10
20
ms
t
DSPDEV
Time to Evaluate Device Speed after Reset
2.5
1000
µs
t
URLK
Time to Detect a Long K from Upstream
2.5
5.5
µs
t
URLSEO
Time to Detect a Long SEO from Upstream
2.5
5.5
µs
t
URPSEO
Duration of Repeating SEO Upstream
23
FS Bits
t
UDEOP
Duration of Sending SEO Upstream after EOF1
2
FS Bits
