mpc8349ea Freescale Semiconductor, Inc, mpc8349ea Datasheet - Page 25

• Manufacturer Part Number: mpc8349ea
• Description: Mpc8349ea Powerquicc
• Manufacturer: Freescale Semiconductor, Inc

8.2.2
This section describes the MII transmit and receive AC timing specifications.
8.2.2.1
Table 26
Figure 10
Freescale Semiconductor
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 V
TX_CLK data clock fall V
Note:
1. The symbols for timing specifications follow the pattern of t
and t
(MT) for the time t
symbol is based on two to three letters representing the clock of a particular function. For example, the subscript of t
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).
(first two letters of functional block)(reference)(state)(signal)(state)
provides the MII transmit AC timing specifications.
shows the MII transmit AC timing diagram.
MPC8349EA PowerQUICC™ II Pro Integrated Host Processor Hardware Specifications, Rev. 10
MII AC Timing Specifications
MII Transmit AC Timing Specifications
TXD[3:0]
Parameter/Condition
TX_CLK
MTX
TX_EN
TX_ER
clock reference (K) going high (H) until data outputs (D) are invalid (X). In general, the clock reference
IH
IL
(max) to V
(min) to V
Table 26. MII Transmit AC Timing Specifications
IH
IL
Figure 10. MII Transmit AC Timing Diagram
t
(min)
(max)
MTXH
DD
/OV
t
DD
MTX
of 3.3 V ± 10%.
for outputs. For example, t
(first two letters of functional block)(signal)(state)(reference)(state)
t
t
MTKHDX
t
MTXH/
Symbol
MTXF
t
MTKHDX
t
t
t
t
MTXR
MTXF
MTX
MTX
t
MTX
1
t
MTXR
Ethernet: Three-Speed Ethernet, MII Management
Min
1.0
1.0
35
—
—
1
MTKHDX
Typ
400
symbolizes MII transmit timing
40
—
—
—
5
Max
4.0
4.0
65
15
—
—
for inputs
MTX
Unit
ns
ns
ns
ns
ns
%
25