mpc8555e Freescale Semiconductor, Inc, mpc8555e Datasheet - Page 26

• Manufacturer Part Number: mpc8555e
• Description: Mpc8555e Powerquicc Iii Processor With Integrated Security
• Manufacturer: Freescale Semiconductor, Inc

Ethernet: Three-Speed, MII Management
8.2.3
This section describes the MII transmit and receive AC timing specifications.
8.2.3.1
Table 22
Figure 10
26
At recommended operating conditions with LV
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 and fall time
Notes:
1. The symbols used for timing specifications herein follow the pattern of t
2. Signal timings are measured at 0.7 V and 1.9 V voltage levels.
3. Guaranteed by design.
(reference)(state)
symbolizes MII transmit timing (MT) for the time t
(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
times, the latter convention is used with the appropriate letter: R (rise) or F (fall).
MPC8555E PowerQUICC™ III Integrated Communications Processor Hardware Specification, Rev. 4.2
provides the MII transmit AC timing specifications.
shows the MII transmit AC timing diagram.
MII AC Timing Specifications
MII Transmit AC Timing Specifications
for inputs and t
Parameter/Condition
TXD[3:0]
TX_CLK
TX_EN
TX_ER
(first two letters of functional block)(reference)(state)(signal)(state)
Table 22. MII Transmit AC Timing Specifications
Figure 10. MII Transmit AC Timing Diagram
t
MTXH
DD
of 3.3 V ± 5%.
t
MTX
MTX
clock reference (K) going high (H) until data outputs (D) are invalid
MTX
t
MTXR
t
Symbol
MTXH/
t
t
represents the MII(M) transmit (TX) clock. For rise and fall
MTKHDX
MTKHDX
t
t
MTXF
t
MTX
, t
MTX
MTXF
t
MTX
2
1
2,3
(first two letters of functional block)(signal)(state)
t
MTXR
Min
1.0
—
—
35
1
for outputs. For example, t
Typ
400
40
—
—
5
Freescale Semiconductor
Max
4.0
—
—
65
15
MTKHDX
Unit
ns
ns
ns
ns
%