VSC8601 Datasheet
Electrical Specifications
5.3.6
RGMII Uncompensated
The following table lists the characteristics when using the device in RGMII
uncompensated mode. For more information about the RGMII uncompensated timing,
see Figure 21, page 81.
Table 74.
AC Characteristics for RGMII Uncompensated
Parameter
Symbol
Minimum Typical Maximum Unit Condition
Clock
frequency
125
25
2.5
MHz 1000BASE-T operation
100BASE-TX operation
10BASE-T operation
1000BASE-T
duty cycle
tDUTY1000
45
50
55
%
At room temperature
and nominal supply
and register 28E.13:12
set to 10 or 11
1000BASE-T
duty cycle
tDUTY1000
40
40
50
50
0
60
60
%
%
ps
Register 28E.13:12 set
to 00 or 01
10/100BASE-T tDUTY10/100
duty cycle
Data to clock
output skew
(at PHY)
tSKEWT
–500
500
Data to clock
output skew
(at receiver)
tSKEWR
1.0
1.8
2.6
ns
TX_CLK
switching
threshold
VTHRESH
1.25
1.65
V
V
VDDIOMAC = 2.5 V
VDDIOMAC = 3.3 V
TX_CLK rise
tR and tF
750
ps
and fall times
Revision 4.1
September 2009
Page 80
VITESSE [ VITESSE SEMICONDUCTOR CORPORATION ]
