TNETE2101

10BASE-T/100BASE-TX/100BASE-FX

LOW-POWER PHYSICAL-LAYER INTERFACE

SPWS032D – JANUARY 1997 – REVISED MARCH 1999

32

POST OFFICE BOX 655303

MDIO timing requirements (see Figure 19)

NO.

PARAMETERS

MIN

MAX

UNIT

1

tsu(MDIO)

Setup time, MDIO valid to MDCLK high (see Note 6)

10

ns

2

th(MDIO)

Hold time, MDCLK high to MDIO changing (see Note 6)

10

ns

NOTE 6: MDIO is a bidirectional signal that can be sourced by the TNETE2101 or the PMI/PHY. When the TNET2101 sources the MDIO signal,

TNETE2101 asserts MDIO synchronous to the rising edge of MDCLK.

2 V

0.8 V

1

2

MDCLK

(input)

MDIO

(I/O)

Figure 19. MDIO Sourced by External Controller

MDIO timing requirements (see Figure 20)

NO.

MIN

MAX

UNIT

1

ta(MDIO)

Access time, MDIO valid to MDCLK high (see Note 7)

0

300

ns

2

tc(MDCLK)

Cycle time

400

NOTE 7: When the MDIO signal is sourced by the PMI/PHY, it is sampled by the TNETE2101 synchronous to the rising edge of MDCLK.

2 V

0.8 V

2 V

1

MDCLK

(input)

MDIO

(I/O)

2

Figure 20. MDIO Sourced by the TNETE2101