TNETE2008 Datasheet, PDF (23/33 Pages) Texas Instruments – OctalPHY EIGHT 10BASE-T PHYSICAL-LAYER INTERFACES

TNETE2008
OctalPHY
EIGHT 10BASE-T PHYSICAL-LAYER INTERFACES
SPWS042B – DECEMBER 1997 – REVISED JUNE 1998
clock limits (see Figure 11)
NO.
PARAMETER
1 tc(IFCLK) Cycle time
2 tw(IFCLK) Pulse width high
3 tw(IFCLK) Pulse width low
4 tr(IFCLK) Rise time (see Note 7)
5 tf(IFCLK) Fall time (see Note 7)
NOTE 7: Measured between 10% and 90% levels of IFCLK amplitude
MIN TYP MAX UNIT
50
ns
22.5
27.5 ns
22.5
27.5 ns
2 ns
2 ns
2
4
1
3
5
IFCLK
(output)
Figure 11. Clock Limits
receive output interface (see Figure 12)
NO.
PARAMETER
MIN MAX UNIT
2 td(IFCOL)
Delay time, from IFCLK↓ to IFCOL valid (see Note 8)
–2
10 ns
2 td(IFCRS)
Delay time, from IFCLK↓ to IFCRS valid (see Note 9)
–2
10 ns
2 td(IFLINK)
Delay time, from IFCLK↓ to IFLINK valid
–2
10 ns
2 td(IFRXD)
Delay time, from IFCLK↓ to IFRXD valid (see Note 10)
–2
10 ns
2 td(IFRXDV) Delay time, from IFCLK↓ to IFRXDV invalid (see Note 11)
–2
10 ns
2 td(IFDUPLEX) Delay time, from IFCLK↓ to IFDUPLEX valid
–2
10 ns
NOTES: 8. For IFRX data, the TNETE2008 asserts IFCOL during the appropriate time slot if there was a collision event during previous time
slot.
9. For IFRX data, the TNETE2008 asserts IFCRS during the appropriate time slot if carrier was detected during previous time slot.
10. The TNETE2008 does not echo transmit data back on the IFRXD3–IFRXD0 terminals during normal operations.
11. The TNETE2008 asserts IFRXDV for IFRX data if there are four valid bits of data in the nibble. Dribble bits at the end of the frame
are discarded.
IFCLK
(output)
IFCOL
IFCRS
IFLINK
IFRXD3–IFRXD0
IFRXDV
IFDUPLEX
(outputs)
2
2
Valid
Figure 12. Multiplexed Receive Interface
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