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Philips Semiconductors Product specification
PDIUSBH12USB 2-port hub
1999 Jul 22
22
CROSSOVER
POINT
CROSSOVER
POINT
CROSSOVER
POINT
SV00514
CROSSOVER
POINT
Hub Delay
Downstream
t
HDD
Hub Delay
Upstream
t
HDD
DOWNSTREAM
DIFFERENTIAL
DATA
UPSTREAM-
DIFFERENTIAL
DATA
UPSTREAM
DIFFERENTIAL
DATA
DOWNSTREAM-
DIFFERENTIAL
DATA
V
DD
V
SS
V
SS
A. DOWNSTREAM HUB DELAY B. UPSTREAM HUB DELAY
SOP DISTORTION
t
SOP
= t
HDD
(SOP) – t
HDD
(NEXT J)
LOW SPEED TIMINGS ARE DETERMINED IN THE SAME WAY FOR:
t
LHDD
AND t
LSOP
Figure 2. Hub Differential Data Delay and SOP distortion
UPSTREAM-
DIFFERENTIAL
DATA
DOWNSTREAM-
DIFFERENTIAL
DATA
V
DD
V
SS
V
SS
A. DOWNSTREAM EOP DELAY B. UPSTREAM EOP DELAY
EOP DELAY
t
EOPD
= t
EOP–
EOP DELAY RELATIVE TO t
HDD
t
EOPDR
= t
EOPD
– t
HDD
EOP SKEW
t
HESK
= t
EOP+
– t
EOP–
LOW SPEED TIMINGS ARE DETERMINED IN THE SAME WAY FOR:
t
LEOPD
, t
LEOPDR
, AND t
LHESK
t
EOP+
t
EOP–
CROSSOVER
POINT
EXTENDED
CROSSOVER
POINT
EXTENDED
UPSTREAM
END OF CABLE
DOWNSTREAM
PORT
t
EOP+
t
EOP–
CROSSOVER
POINT
EXTENDED
CROSSOVER
POINT
EXTENDED
SV00515
Figure 3. Hub EOP Delay and EOP Skew