Datasheet

75 www.national.com
DP83856
6.0 Electrical Specifications (Continued)
6.4.2 GMII Receive Timing
Parameter Description Notes Min Typ Max Units
T15 ↑ RX_CLK to RXD, RX_DV and RX_ER delay Note 2, 3, 4 0.5 5.5 ns
T16 RX_CLK Duty Cycle 40 60 %
T17 RX_CLK t
R
/t
F
Note 1, 4, 5 1 ns
T18 MDI to GMII latency 384 ns
Note 1: t
r
and t
f
are measured from V
IL_AC(MAX)
= 0.7V to V
IH_AC(MIN)
= 1.9V.
Note 2: t
delay max
is measured from clock level of 0.7V to data level of 1.9V for data = ‘1’; and clock level = 0.7V to.data level 0.7V for data = ‘0’.
Note 3: t
delay min
is measured from clock level of 1.9V to data level of 1.9V for data = ‘1’; and clock level = 1.9V to.data level 0.7V for data = ‘0’.
Note 4: GMII Receiver input template measured with “GMII point-to-point test circuit”, see Test Conditions Section.
Note 5: Guaranteed by design. Not tested.
T17
T16
T17
RX_CLK
RXD[7:0]
RX_DV
RX_ER
Valid Data
T15
Begin of Frame
MDI
T18