Datasheet

MPC8309 PowerQUICC II Pro Integrated Communications Processor Family Hardware Specifications, Rev. 2
Freescale Semiconductor 23
Ethernet and MII management
8.2 MII and RMII AC timing specifications
The AC timing specifications for MII and RMII are presented in this section.
8.2.1 MII AC timing specifications
This section describes the MII transmit and receive AC timing specifications.
8.2.1.1 MII transmit AC timing specifications
The following table provides the MII transmit AC timing specifications.
Table 19. MII and RMII DC electrical characteristics
Parameter Symbol Conditions Min Max Unit
Supply voltage 3.3 V OV
DD
—33.6V
Output high voltage V
OH
I
OH
= –4.0 mA OV
DD
=Min 2.40 OV
DD
+0.3 V
Output low voltage V
OL
I
OL
= 4.0 mA OV
DD
= Min GND 0. 50 V
Input high voltage V
IH
——2.0OV
DD
+0.3 V
Input low voltage V
IL
— — –0.3 0.90 V
Input current I
IN
0 V ≤ V
IN
≤ OV
DD
—±5μA
Table 20. MII transmit AC timing specifications
At recommended operating conditions with OV
DD
of 3.3 V ± 300mV.
Parameter/Condition Symbol
1
Min Typical Max Unit
TX_CLK clock period 10 Mbps t
MTX
—400—ns
TX_CLK clock period 100 Mbps t
MTX
—40—ns
TX_CLK duty cycle t
MTXH
/t
MTX
35 — 65 %
TX_CLK to MII data TXD[3:0], TX_ER, TX_EN delay t
MTKHDX
1 5 15 ns
TX_CLK data clock rise V
IL
(min) to V
IH
(max) t
MTXR
1.0 — 4.0 ns
TX_CLK data clock fall V
IH
(max) to V
IL
(min) t
MTXF
1.0 — 4.0 ns
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, t
MTKHDX
symbolizes MII transmit
timing (MT) for the time t
MTX
clock reference (K) going high (H) until data outputs (D) are invalid (X). Note that, in general,
the clock reference symbol representation is based on two to three letters representing the clock of a particular functional.
For example, the subscript of t
MTX
represents the MII(M) transmit (TX) clock. For rise and fall times, the latter convention is
used with the appropriate letter: R (rise) or F (fall).