Oki B410 Maintenance Manual page 144

Oki Data CONFIDENTIAL
(8) Signal Level
• Input and Output Level
Input level:
High (Driven)
High (Floating)
Low
Output level:
Low
High (Driven)
Output signal crossover voltage
• Signal level
Difference "1"
Difference "0"
Single-ended 0 (SE0)
Data J state:
Data K state:
Idling State
Restart State
Start of the packet
(SOP)
End of the Packet
(EOP)
Not connected
(Downstream port)
Connected
(Downstream port)
Reset
Note!
The EOP width is defined by the bit time for a device type of the device receiving EOP.
The bit time is an approximate value.
43984801TH Rev.1
Parameter
Bus Status
(D+) - (D-) > 200mV and D+ >
VIH (Min.)
(D-) - (D+) > 200mV and D- >
VIH (Min.)
D+ and D- < VIL (Max.)
Difference "0"
Low speed
Difference "1"
Full speed
Low speed Difference "1"
Difference "0"
Full speed
Low Speed D- > VIHZ (Min.) and D+ < VIL (Max.)
D+ > VIHZ (Min.) and D- < VIL (Max.)
Full Speed
Data K State
The data line switches from the idling to the K state
≧ SEO of 1 bit time, and then, J state
of I bit time
SEO in ≧ 2.5μs
Idling in ≧ 2.5μs
In ≧ 10ms, D+ and D- < VIL (Max.)
Signal Minimum Maximum
VIH 2.0
VIHZ 2.7
VIL
OL 0.0
OH 2.8
VCRS 1.3
Signal Level
Request
(D+) - (D-) > 200mV
(D-) - (D+) > 200mV
D + and D- < VIH (Min.)
D- > VIHZ (Min.) and D+ < VIH (Min.)
D+ > VIHZ (Min.) and D- < VIH (Min.
1 ≧ SEO of 1 bit time, and then, J
state.
Idling in ≧ 2.5μs
In ≧ 2.5μs, D+ and D-＜VIL (Max.)
Appendix B USB Interface
Unit
V
3.6 V
0.8 V
0.3 V
3.6 V
2.0 V
Acceptance
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