MPC8347 FREESCALE [Freescale Semiconductor, Inc], MPC8347 Datasheet - Page 28

• Manufacturer Part Number: MPC8347
• Description: Integrated Host Processor Hardware Specifications
• Manufacturer: FREESCALE [Freescale Semiconductor, Inc]

Ethernet: Three-Speed Ethernet, MII Management
8.2.2
This section describes the MII transmit and receive AC timing specifications.
8.2.2.1
Table 26
Figure 9
28
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)
shows the MII transmit AC timing diagram.
provides the MII transmit AC timing specifications.
MII AC Timing Specifications
MPC8347EA PowerQUICC II Pro Integrated Host Processor Hardware Specifications, Rev. 3
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 9. MII Transmit AC Timing Diagram
t
(min)
(max)
MTXH
DD
/ OV
t
MTX
DD
of 3.3 V ± 10%.
for outputs. For example, t
(first two letters of functional block)(signal)(state) (reference)(state)
t
t
Symbol
MTKHDX
MTXH/
t
t
MTXF
MTKHDX
t
t
t
t
MTXR
MTXF
MTX
MTX
t
MTX
1
t
MTXR
Min
1.0
1.0
35
—
—
1
MTKHDX
Typ
400
40
—
—
—
symbolizes MII transmit timing
5
Freescale Semiconductor
Max
4.0
4.0
65
15
—
—
for inputs
Unit
MTX
ns
ns
ns
ns
ns
%