MV78200 Datasheet, PDF (81/128 Pages) –

Electrical Specifications
9.6.4
Gigabit Media Independent Interface (GMII) AC Timing
9.6.4.1
GMII AC Timing Table
Table 40: GMII AC Timing Table
De s cr iption
GTX_CLK cycle time
RX_CLK cycle time
GTX_CLK and RX_CLK high level w idth
GTX_CLK and RX_CLK low level w idth
GTX_CLK and RX_CLK rise time
GTX_CLK and RX_CLK fall time
Data input setup time relative to RX_CLK rising edge
Data input hold time relative to RX_CLK rising edge
Data output valid before GTX_CLK rising edge
Data output valid after GTX_CLK rising edge
Sym bol
tCK
tCKrx
tHIGH
tLOW
tR
tF
tSETUP
tHOLD
tOVB
tOVA
125 MHz
M in
M ax
7.5
8.5
7.5
-
2.5
-
2.5
-
-
1.0
-
1.0
2.0
-
0.0
-
2.5
-
0.5
-
Units
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
Note s
-
-
1
1
1, 2
1, 2
-
-
1
1
Note s :
General comment: All values w ere measured from VIL(max) to VIH(min), unless otherw ise specified.
1. For all signals, the load is CL = 5 pF.
2. Rise time measured f rom VIL(max) to VIH(min), f all time measured f rom VIH(min) to VIL(max).
9.6.4.2
GMII Test Circuit
Figure 13: GMII Test Circuit
Test Point
CL
Copyright © 2008 Marvell
December 6, 2008, Preliminary
Document Classification: Proprietary Information
MV-S104671-U0 Rev. C
Page 81