Intel
®
IXF1104 4-Port Gigabit Ethernet Media Access Controller
Datasheet
142
Document Number: 278757
Revision Number: 009
Revision Date: 27-Oct-2005
7.4
GMII AC Timing Specification
7.4.1
1000 Base-T Operation
Figure 38
and
Figure 39
and
Table 49
and
Table 50
provide GMII AC timing specifications.
7.4.1.1
1000 BASE-T Transmit Interface
Figure 38. 1000BASE-T Transmit Interface Timing
Table 49. GMII 1000BASE-T Transmit Signal Parameters
Symbol
Parameter
Min
Typ
1
Max
Unit
2
t1
TXD[7:0], TXEN, TXER Set-up to TXC High
2.5
–
–
ns
t2
TXD[7:0], TXEN, TXER Hold from TXC High
0.5
–
–
ns
t3
TXEN sampled to CRS asserted
–
–
16
BT
t4
TXEN sampled to CRS de-asserted
–
–
16
BT
1. Typical values are at 25
o
C and are for design aid only; not guaranteed and not subject to production
testing.
2. Bit Time (BT) is the duration of one bit as transferred to/from the PHY and is the reciprocal of bit rate. BT for
1000BASE-T = 10
-9
or 1 ns.
B0634-01
GTX_CLK
TXEn
TXD[7:0]
TXER
CPS
t1
t3
t4
t2