ThunderLAN

™ TNETE110

PCI ETHERNET

™ CONTROLLER

SINGLE-CHIP 10 BASE-T

SPWS018B – MARCH 1995 - REVISED MAY 1996

19

POST OFFICE BOX 1443

timing requirements of management data I/O (MDIO) (see Figure 5)

MIN

MAX

UNIT

ta(MDCLKH-MDIOV) Access time, MDIO valid from MDCLK high (see Note 19)

0

300

ns

NOTE 19: When the MDIO signal is sourced by the PMI /PHY, it is sampled by TNETE110 synchronous to the rising edge of MDCLK.

switching characteristics of MDIO (see Figure 6)

PARAMETER

MIN

MAX

UNIT

tsu(MDIOV-MDCLKH)

Setup time, MDIO valid to MDCLK high (see Note 20)

10

ns

th(MDCLKH-MDIOX)

Hold time, MDCLK high to MDIO changing (see Note 20)

10

ns

NOTE 20: MDIO is a bidirectional signal that can be sourced by TNETE110 or by the PMI /PHY. When TNETE110 sources the MDIO signal,

TNETE110 asserts MDIO synchronous to the rising edge of MDCLK.

ta(MDCLKH-MDIOV)

MDCLK

MDIO

Figure 5. Management Data I/O Timing (Sourced by PHY)

tsu(MDIOV-MDCLKH)

th(MDCLKH-MDIOX)

MDCLK

MDIO

Figure 6. Management Data I/O Timing (Sourced by TNETE110)