ThunderLAN

™ TNETE100

PCI ETHERNET

™ CONTROLLER

SINGLE-CHIP 10 BASE-T WITH MII FOR 100 BASE-T/100VG-AnyLAN

™

SPWS017B – APRIL 1995 – REVISED AUGUST 1996

21

POST OFFICE BOX 1443

timing requirements for MDIO (see Figure 6)

MIN

MAX

UNIT

ta(MDCLKH-MDIOV) Access time, MDIO valid from MDCLK high (see Note 20)

0

300

ns

switching characteristics for MDIO (see Figure 7)

PARAMETER

MIN

MAX

UNIT

td(MDIOV-MDCLKH)

Delay time, MDIO valid to MDCLK high (see Note 21)

10

ns

td(MDCLKH-MDIOX) Delay time, MDCLK high to MDIO changing (see Note 21)

10

ns

NOTES: 20. When the MDIO signal is sourced by the PMI /PHY, it is sampled by TNETE100 synchronous to the rising edge of MDCLK.

21. MDIO is a bidirectional signal that can be sourced by TNETE100 or the PMI /PHY. When TNETE100 sources the MDIO signal,

TNETE100 asserts MDIO synchronous to the rising edge of MDCLK.

ta(MDCLKH-MDIOV)

MDCLK

MDIO

Figure 6. Management Data I/O Timing (Sourced by PHY)

td(MDIOV-MDCLKH)

td(MDCLKH-MDIOX)

MDCLK

MDIO

Figure 7. Management Data I/O Timing (Sourced by TNETE100)