EP80579 Datasheet, PDF (1886/1916 Pages) Intel Corporation – Intel® EP80579 Integrated Processor Product Line

Intel^® EP80579 Integrated Processor
49.5.13.3.5 GbE Ethernet Interface — RGMII Mode Receive Timings
Table 49-78 shows the AC specification.
Table 49-78. GbE Receive Timing Values — RGMII Mode
Symbol
Parameter
Min
Nominal
Max
Units Notes
T₁
RGMII input clock period (1000 Base)
7.2
8.0
8.8
ns 1, 6
T₁
RGMII input clock period (100 Base)
36
40
44
ns 1, 6
T₁
RGMII input clock period (10 Base)
360
400
440
ns 1, 6
T₂
1000 base duty cycle with respect to T₁
(Nom.)
45
50
55
% 1, 3, 6
T₂
100/10 base duty cycle with respect to T₁
(Nom.)
40
50
60
%
1, 3,
4, 6
T₃
Low to high rise time (20% to 80%)
T₄
High to low fall time (80% to 20%)
T₅
Data to clock output SKEW (at
transmitter)
-
-
-
-
-500
0
1.0
ns 1, 5, 6
1.0
ns 1, 5, 6
500
ps 1, 3, 6
T₆
Data to clock output SKEW (at receiver)
1
-
2.6
ns 6
Notes:
1.
This applies to the GBEn_RxCLK signal operating in RGMII mode.
2.
This applies to the GBEn_RXDATA[3:0] signals for RGMII mode.
3.
Duty cycle may be stretched/shrunk during speed changes or while transitioning to a received
packet's clock domain as long as minimum duty cycle is not violated and stretching occurs for no
more than three Tcyc of the lowest speed transitioned between.
4.
Measurement points for Rise time are 20% GBE V_CC to 80% GBE V_CC.
5.
Measurement points for Fall time are 80% GBE V_CC to 20% GBE V_CC.
6.
Guaranteed by design. These values are typical values seen for this process, but not measured
during production testing.
Figure 49-37 shows the RGMII receive timing diagram.
Figure 49-37.GbE Receive Waveform — RGMII Mode
T1
T₂
T₂
T3
T4
GBEn_RxCLK[0]
(at transmitter)
GBEn_RxDATA[3:0]
GBEn_RxDATA[8]
RXDATA[3:0]
RXDATA[7:4]
RXDV
T₃ / T₄
T5
T₆
V_{CC( 80%)}
VCC (20%)
GBEn_RxCLK[0]
(at receiver)
49.5.13.3.6 Design to Test Loads
The I/Os are implemented to support a 5pF load to ground for AC timing.
B6575-01
Intel^® EP80579 Integrated Processor Product Line Datasheet
1886
August 2009
Order Number: 320066-003US