MPC8309EC datasheet(27/82 Pages) FREESCALE

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MPC8309 PowerQUICC II Pro Integrated Communications Processor Family Hardware Specifications, Rev. 0

Freescale Semiconductor

Ethernet and MII Management

Figure 15 shows the RMII transmit AC timing diagram.

Figure 15. RMII Transmit AC Timing Diagram

8.2.2.2

RMII Receive AC Timing Specifications

Table 21 provides the RMII receive AC timing specifications.

Table 23. RMII Receive AC Timing Specifications

At recommended operating conditions with OVDD of 3.3 V ± 300mV.

Parameter/Condition

Symbol1

Min

Typical

Max

Unit

REF_CLK clock period

tRMX

—20—

REF_CLK duty cycle

tRMXH/tRMX

—

RXD[1:0], CRS_DV, RX_ER setup time to REF_CLK

tRMRDVKH

4.0

—

RXD[1:0], CRS_DV, RX_ER hold time to REF_CLK

tRMRDXKH

2.0

—

REF_CLK clock rise VIL(min) to VIH(max)

tRMXR

1.0

—

4.0

REF_CLK clock fall time VIH(max) to VIL(min)

tRMXF

1.0

—

4.0

Note:

1. The symbols used for timing specifications follow the pattern of t(first three 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, tRMRDVKH symbolizes RMII

receive timing (RMR) with respect to the time data input signals (D) reach the valid state (V) relative to the tRMX clock

reference (K) going to the high (H) state or setup time. Also, tRMRDXKL symbolizes RMII receive timing (RMR) with respect

to the time data input signals (D) went invalid (X) relative to the tRMX 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 tRMX represents the RMII (RM) reference (X) clock. For rise and fall times,

the latter convention is used with the appropriate letter: R (rise) or F (fall).

REF_CLK

TXD[1:0]

tRMTKHDX

tRMX

tRMXH

tRMXR

tRMXF

TX_EN

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