LXT972 Level One, LXT972 Datasheet - Page 42

• Manufacturer Part Number: LXT972
• Description: 3.3V Dual-Speed Fast Ethernet Transceiver Datasheet
• Manufacturer: Level One

LXT972 3.3V Dual-Speed Fast Ethernet Transceiver
Figure 25: 10BASE-T Receive Timing
Table 27: 10BASE-T Receive Timing Parameters
42
RXD, RX_DV, RX_ER Setup to RX_CLK
High
RXD, RX_DV, RX_ER Hold from RX_CLK
High
TPIP/N in to RXD out (Rx latency)
CRS asserted to RXD, RX_DV, RX_ER
asserted
RXD, RX_DV, RX_ER de-asserted to CRS
de-asserted
TPI in to CRS asserted
TPI quiet to CRS de-asserted
TPI in to COL asserted
TPI quiet to COL de-asserted
1. Typical values are at 25 °C and are for design aid only; not guaranteed and not subject to production testing.
2. BT is the duration of one bit as transferred to and from the MAC and is the reciprocal of the bit rate. 10BASE-T bit time = 10
R X _ C L K
R X _ D V ,
R X _ E R
R X D ,
C R S
C O L
TPI
Parameter
t
6
t
8
t
3
t
4
Sym
t1
t2
t3
t4
t5
t6
t7
t8
t9
Min
5.8
0.3
10
10
5
2
6
1
5
Typ
t
1
–
–
–
–
–
–
–
–
–
1
t
2
Max
6.0
0.5
32
28
10
31
10
–
–
Units
BT
BT
BT
BT
BT
BT
BT
ns
ns
2
t
t
7
9
Test Conditions
t
5
-7
–
–
–
–
–
–
–
–
–
s or 100 ns.