MPC8540CPX667JC datasheet(27/104 Pages) FREESCALE

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MPC8540 Integrated Processor Hardware Specifications, Rev. 4

Freescale Semiconductor

Ethernet: Three-Speed,10/100, MII Management

8.2.2.2

MII Receive AC Timing Specifications

Table 26 provides the MII receive AC timing specifications.

Figure 10 shows the MII receive AC timing diagram.

Figure 10. MII Receive AC Timing Diagram

Table 26. MII Receive AC Timing Specifications

At recommended operating conditions with LVDD of 3.3 V ± 5%, or LVDD=2.5V ± 5%.

Parameter/Condition

Symbol 1

Min

Typ

Max

Unit

RX_CLK clock period 10 Mbps

tMRX

—400

—

RX_CLK clock period 100 Mbps

tMRX

—40—

RX_CLK duty cycle

tMRXH/tMRX

—

RXD[3:0], RX_DV, RX_ER setup time to RX_CLK

tMRDVKH

10.0

—

RXD[3:0], RX_DV, RX_ER hold time to RX_CLK

tMRDXKH

10.0

—

RX_CLK clock rise and fall time

tMRXR, tMRXF

2,3

1.0

—

4.0

Note:

1. The symbols used for timing specifications herein follow the pattern of t(first two letters of functional block)(signal)(state)

(reference)(state) for inputs and t(first two letters of functional block)(reference)(state)(signal)(state) for outputs. For example, tMRDVKH

symbolizes MII receive timing (MR) with respect to the time data input signals (D) reach the valid state (V) relative to

the tMRX clock reference (K) going to the high (H) state or setup time. Also, tMRDXKL symbolizes MII receive timing

(GR) with respect to the time data input signals (D) went invalid (X) relative to the tMRX clock reference (K) going to

the low (L) state or hold time. Note that, in general, the clock reference symbol representation is based on three letters

representing the clock of a particular functional. For example, the subscript of tMRX represents the MII (M) receive

(RX) clock. For rise and fall times, the latter convention is used with the appropriate letter: R (rise) or F (fall).

2.Signal timings are measured at 0.7 V and 1.9 V voltage levels.

3.Guaranteed by design.

RX_CLK

RXD[3:0]

tMRDXKH

tMRX

tMRXH

tMRXR

tMRXF

RX_DV

RX_ER

tMRDVKH

Valid Data

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