Marvel Group 88F6281 Gigabit Media Independent Interface Gmii AC Timing, Gmii AC Timing Table

Electrical Specifications

AC Electrical Specifications

8.6.4Gigabit Media Independent Interface (GMII) AC Timing

8.6.4.1GMII AC Timing Table

Table 51: GMII AC Timing Table

		125 MHz
Description	Symbol	Min	Max	Units	Notes
GTX_CLK cycle time	tCK	7.5	8.5	ns	-
RX_CLK cycle time	tCKrx	7.5	-	ns	-
GTX_CLK and RX_CLK high level w idth	tHIGH	2.5	-	ns	1
GTX_CLK and RX_CLK low level w idth	tLOW	2.5	-	ns	1
GTX_CLK and RX_CLK rise time	tR	-	1.0	ns	1, 2
GTX_CLK and RX_CLK fall time	tF	-	1.0	ns	1, 2
Data input setup time relative to RX_CLK rising edge	tSETUP	2.0	-	ns	-
Data input hold time relative to RX_CLK rising edge	tHOLD	0.0	-	ns	-
Data output valid before GTX_CLK rising edge	tOVB	2.5	-	ns	1
Data output valid after GTX_CLK rising edge	tOVA	0.5	-	ns	1

Notes:

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 from VIL(max) to VIH(min), fall time measured from VIH(min) to VIL(max).

8.6.4.2GMII Test Circuit

Figure 11: GMII Test Circuit

Test Point

CL

Copyright © 2008 Marvell		Doc. No. MV-S104859-U0 Rev. E
December 2, 2008, Preliminary	Document Classification: Proprietary Information	Page 95