mpc8309 Freescale Semiconductor, Inc, mpc8309 Datasheet - Page 24

• Manufacturer Part Number: mpc8309
• Description: Powerquicc Ii Pro Integrated Communications Processor Family Hardware Specifications
• Manufacturer: Freescale Semiconductor, Inc

Ethernet and MII Management
8.2
The AC timing specifications for MII and RMII are presented in this section.
8.2.1
This section describes the MII transmit and receive AC timing specifications.
8.2.1.1
Table 20
24
At recommended operating conditions with OV
Supply voltage 3.3 V
Output high voltage
Output low voltage
Input high voltage
Input low voltage
Input current
TX_CLK clock period 10 Mbps
TX_CLK clock period 100 Mbps
TX_CLK duty cycle
TX_CLK to MII data TXD[3:0], TX_ER, TX_EN delay
TX_CLK data clock rise V
TX_CLK data clock fall V
Note:
1. The symbols used for timing specifications follow the pattern of t
inputs and t
timing (MT) for the time t
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
used with the appropriate letter: R (rise) or F (fall).
MPC8309 PowerQUICC II Pro Integrated Communications Processor Family Hardware Specifications, Rev. 0
provides the MII transmit AC timing specifications.
MII and RMII AC Timing Specifications
Parameter
MII AC Timing Specifications
(first two letters of functional block)(reference)(state)(signal)(state)
MII Transmit AC Timing Specifications
Parameter/Condition
IH
IL
(max) to V
(min) to V
MTX
clock reference (K) going high (H) until data outputs (D) are invalid (X). Note that, in general,
Table 19. MII and RMII DC Electrical Characteristics
MTX
Table 20. MII Transmit AC Timing Specifications
IH
IL
represents the MII(M) transmit (TX) clock. For rise and fall times, the latter convention is
Symbol
(min)
(max)
OV
V
V
DD
V
V
I
OH
IN
OL
IH
IL
DD
of 3.3 V ± 300mV.
I
OH
I
OL
= –4.0 mA
= 4.0 mA
—
—
0 V  V
Conditions
t
MTXH
Symbol
t
MTKHDX
IN
—
t
t
t
t
MTXR
MTXF
MTX
MTX
(first two letters of functional block)(signal)(state)(reference)(state)
for outputs. For example, t
 OV
/t
OV
OV
MTX
1
DD
DD
DD
—
—
= Min
= Min
Min
1.0
1.0
35
—
—
1
GND
2.40
–0.3
Min
2.0
—
3
Typical
MTKHDX
400
40
—
—
—
5
Freescale Semiconductor
OV
OV
symbolizes MII transmit
DD
DD
Max
0.50
0.90
3.6
±5
Max
4.0
4.0
65
15
+ 0.3
+ 0.3
—
—
Unit
Unit
A
ns
ns
ns
ns
ns
%
V
V
V
V
V
for