MPC8533VTALJB datasheet(28/116 Pages) FREESCALE

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MPC8533E PowerQUICC™ III Integrated Processor Hardware Specifications, Rev. 3

Freescale Semiconductor

Enhanced Three-Speed Ethernet (eTSEC), MII Management

Figure 9 shows the GMII transmit AC timing diagram.

Figure 9. GMII Transmit AC Timing Diagram

8.3.2.2

GMII Receive AC Timing Specifications

Table 26 provides the GMII receive AC timing specifications.

Figure 10 provides the AC test load for eTSEC.

Figure 10. eTSEC AC Test Load

Table 26. GMII Receive AC Timing Specifications

At recommended operating conditions with L/TVDD of 3.3 V ± 5% or 2.5 V ± 5%

Parameter/Condition

Symbol1

Min

Typ

Max

Unit

Notes

RX_CLK clock period

tGRX

—8.0

—

RX_CLK duty cycle

tGRXH/tGRX

—

RXD[7:0], RX_DV, RX_ER setup time to RX_CLK

tGRDVKH

2.0

—

RX_CLK to RXD[7:0], RX_DV, RX_ER hold time

tGRDXKH

0.5

—

RX_CLK clock rise (20%–80%)

tGRXR

——

1.0

—

RX_CLK clock fall time (80%–20%)

tGRXF

——

1.0

—

Note:

1. The symbols used for timing specifications 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, tGRDVKH symbolizes GMII receive

timing (GR) with respect to the time data input signals (D) reaching the valid state (V) relative to the tRX clock reference (K)

going to the high state (H) or setup time. Also, tGRDXKL symbolizes GMII receive timing (GR) with respect to the time data

input signals (D) went invalid (X) relative to the tGRX 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 tGRX represents the GMII (G) receive (RX) clock. For rise and fall times, the latter convention

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

GTX_CLK

TXD[7:0]

tGTKHDX

tGTX

tGTXH

tGTXR

tGTXF

tGTKHDV

TX_EN

TX_ER

Output

Z0 = 50 Ω

LVDD/2

RL = 50 Ω

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