mpc8641 Freescale Semiconductor, Inc, mpc8641 Datasheet - Page 35

• Manufacturer Part Number: mpc8641
• Description: Integrated Host Processor Hardware Specifications
• Manufacturer: Freescale Semiconductor, Inc

8.2.3
This section describes the MII transmit and receive AC timing specifications.
8.2.3.1
Table 30
Figure 13
Freescale Semiconductor
At recommended operating conditions with L/TV
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 time (20%-80%)
TX_CLK data clock fall time (80%-20%)
Note:
1. The symbols used for timing specifications herein follow the pattern of t
2. Guaranteed by design.
for inputs and t
transmit timing (MT) for the time t
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
convention is used with the appropriate letter: R (rise) or F (fall).
provides the MII transmit AC timing specifications.
shows the MII transmit AC timing diagram.
MII AC Timing Specifications
MII Transmit AC Timing Specifications
MPC8641 and MPC8641D Integrated Host Processor Hardware Specifications, Rev. 2
(first two letters of functional block)(reference)(state)(signal)(state)
TXD[3:0]
TX_CLK
Parameter/Condition
TX_EN
TX_ER
Table 30. MII Transmit AC Timing Specifications
MTX
Figure 13. MII Transmit AC Timing Diagram
t
MTXH
clock reference (K) going high (H) until data outputs (D) are invalid (X). Note that, in
DD
MTX
of 3.3 V ± 5%.
t
MTX
represents the MII(M) transmit (TX) clock. For rise and fall times, the latter
Ethernet: Enhanced Three-Speed Ethernet (eTSEC), MII Management
t
t
Symbol
MTKHDX
MTXH/
t
t
MTXF
MTKHDX
t
t
MTXR
t
MTXF
t
MTX
MTX
t
MTX
2
2
2
for outputs. For example, t
(first two letters of functional block)(signal)(state) (reference)(state)
1
t
MTXR
Min
1.0
1.0
35
—
—
1
Typ
400
40
—
—
—
5
MTKHDX
symbolizes MII
Max
4.0
4.0
—
—
65
15
Unit
ns
ns
ns
ns
ns
%
35