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DM9601
USB to Ethernet MAC Controller with Integrated 10/100 PHY
Preliminary
45
Version: DM9601-DS-P01
June 22, 2001
13.5 AC Electrical Characteristics & Timing Waveforms
13.5.1 TP Interface
Symbol
Parameter
Min.
Typ.
Max.
Unit
Conditions
tTR/F
100TX+/- Differential Rise/Fall Time
3.0
---
5.0
ns
TTM
100TX+/- Differential Rise/Fall Time Mismatch
0
---
0.5
ns
TTDC
100TX+/- Differential Output Duty Cycle
Distortion
0
---
0.5
ns
tT/T
100TX+/- Differential Output Peak-to-Peak Jitter
0
---
1.4
ns
XOST
100TX+/- Differential Voltage Overshoot
0
---
5
%
13.5.2 Oscillator/Crystal Timing
Symbol
Parameter
Min.
Typ.
Max.
Unit
Conditions
TCKC
OSC Cycle Time
39.998
40
40.002
ns
50ppm
TPWH
OSC Pulse Width High
16
20
24
ns
TPWL
OSC Pulse Width Low
16
20
24
ns
13.5.3 USB Transceiver Interface AC Specification
Symbol
Parameter
Condition
Min
Max
Unit
TFR
Rise time
CL=50pf
4
20
ns
TFF
Fall time
CL=50pf
4
20
ns
Tfrfm
Rise time / Fall time
matching
90
111.1
%
VCRS
Output voltage cross point
1.3
2.0
V
13.5.4 External MII Interface Transmit Timing
TXCK
TXEN
TXD[3:0]
T1
∫∫
←
→
←→
∫∫
T2
∫∫
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