Oki B2200, Maintenance Manual

Page: 96 / 100

Oki Data CONFIDENTIAL
43641601TH Rev.1
96 /
Note
: The width of EOP is defined in bit time relative to the device type receiving the EOP. The bit
time is approximate.
(8) Signal Level
• Input/Output Level
• Signal Level
Parameter Signal Min. Max. Unit
Input Level:
High (driven) VIH 2.0 V
High (floating) VIHZ 2.7 3.6 V
Low VIL 0.8 V
Output Level:
Low OL 0.0 0.3 V
High (driven) OH 2.8 3.6 V
Output Signal Crossover Voltage VCRS 1.3 2.0 V
Bus state
Signal Level
Required Acceptable
Differential “1” (D+) – (D-) > 200 mV and D+ > VIH
(min) (D+) – (D-) > 200 mV
Differential “0” (D-) – (D+) > 200 mV and D- > VIH
(min) (D-) – (D+) > 200 mV
Single-ended 0 (SE0) D+ and D- < VIH (max) D+ and D- < VIH (min)
Data J state:
Low speed
Full speed
Differential “0”
Differential “1”
Data K state:
Low speed
Full speed
Differential “1”
Differential “0”
Idle state:
Low speed
Full speed
D- > VIHZ (min) and D+ < VIL (max)
D+ > VIHZ (min) and D- < VIL (max) D- > VIHZ (min) and D+ < VIH (max)
D+ > VIHZ (min) and D- < VIH (max)
Resume state Data K state
Start of packet (SOP) Data lines switch from Idle to K state.
End of packet (EOP) SE0 for
≥
1 bit time, followed by J
state for 1 bit time
SE0 for
≥
1 bit time, followed by J
state
Disconnect
(at downstream port) SE0 for
≥
2.5 μs
Connect
(at downstream port) Idle for
≥
2.5 ms Idle for
≥
2.5 μs
Reset D+ and D- < VIL (max) for
≥
10 ms D+ and D- < VIL (max) for
≥
2.5 μs