Oki B4500 Maintenance Manual page 112

8) Signal Level
• Input / Output Level
Input Levels :
High (driven)
High (floating)
Low
Output Levels :
Low
High (driven)
Output Signal Crossover Voltage
• Signaling Levels
Bus State
Differential "1"
Differential "0"
Single-ended 0 (SE0)
Data J state:
Low-speed
Full-speed
Data K state:
Low-speed
Full-speed
Idle state:
Low-speed
Full-speed
Resume state
Start-of-Packet (SOP)
End-of-Packet (EOP)
Disconnect
(at downstream port)
Connect
(at downstream port)
Reset
Note: The width of EOP is defined in bit times relative to the device type receiving the EOP. The
bit time is approximate.
43502101TH Rev.1
Parameter
Signaling Levels
Required
(D+) - (D-) > 200mV and D+ > V
(D-) - (D+) > 200mV and D- > V
D+ and D- < V (max)
IL
Differential "0"
Differential "1"
Differential "1"
Differential "0"
D- > V (min) and D+ < V
IHZ
D+ > V (min) and D- < V
IHZ
Data K state
Data lines switch from Idle to K state
SE0 for ≥ 1 bit time
1
followed by a J state
for 1 bit time
SE0 for ≥ 2.5µs
Idle for ≥ 2ms
(max) for ≥ 10ms
D+ and D- < V
IL
Symbol Min. Max.
V 2.0
IH
V 2.7
IHZ
V
IL
OL 0.0
OH 2.8
V 1.3
CRS
(min) (D+) - (D-) > 200mV
IH
(min) (D-) - (D+) > 200mV
IH
D+ and D- < V
(max) D- > V (min) and D+ < V
IL IHZ
(max) D+ > V (min) and D- < V
IL IHZ
SE0 for ≥ 1 bit time
Idle for ≥ 2.5µs
D+ and D- < V
Oki Data CONFIDENTIAL
Units
V
3.6 V
0.8 V
0.3 V
3.6 V
2.0 V
Acceptable
(min)
IH
(min)
IH
(min)
IH
1
followed by a J state
(max) for ≥ 2.5µs
IL
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