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