ThunderLAN

™ TNETE110

PCI ETHERNET

™ CONTROLLER

SINGLE-CHIP 10 BASE-T

SPWS018B – MARCH 1995 - REVISED MAY 1996

17

POST OFFICE BOX 1443

tVAL(PTP)

Delay time, PCLK to bused signals valid point-to-point (see Notes 15 and 16)

2

12

ns

ton

Float to active delay

2

ns

toff

Active to float delay

28

ns

NOTES: 14. Some of the timing symbols in this table currently are not listed with EIA or JEDEC standards for semiconductor symbology, but are

consistent with the PCI Local-Bus Specification, Revision 2.0.

15. Minimum times are measured with a 0-pF equivalent load; maximum times are measured with a 50-pF equivalent load. Actual test

capacitance can vary, but results should be correlated to these specifications.

16. PREQ and PGNT are point-to-point signals, and have different output valid delay and input setup times than do bused signals. PGNT

has a setup time of 10 ns; PREQ has a setup time of 12 ns. All other signals are bused.

timing requirements of PCI 5 V and 3.3 V (see Note 14 and Figure 4)

MIN

MAX

UNIT

tsu

Setup time, bused signals valid to PCLK (see Note 16)

7

ns

tsu(PTP)

Setup time to PCLK—point-to-point (see Note 16)

10, 12

ns

th

Hold time, input from PCLK

0

ns

tc

Cycle time, PCLK (see Note 17)

30

500

ns

tw(H)

Pulse duration, PCLK high

12

ns

tw(L)

Pulse duration, PCLK low

12

ns

tslew

Slew rate, PCLK (see Note 18)

1

4

V/ns

NOTES: 14. Some of the timing symbols in this table currently are not listed with EIA or JEDEC standards for semiconductor symbology, but are

consistent with the PCI Local-Bus Specification, Revision 2.0.

16. PREQ and PGNT are point-to-point signals, and have different output valid delay and input setup times than do bused signals. PGNT

has a setup time of 10 ns; PREQ has a setup time of 12 ns. All other signals are bused.

17. As a requirement for frame transmission /reception, the minimum PCLK frequency varies with network speed. The clock can only

be stopped in a low state.

18. Rise and fall times are specified in terms of the edge rate measured in V/ns. This slew rate must be met across the minimum

peak-to-peak portion of the clock waveform.