Electronic Component Distributor. Source::Freescale Semiconductor
P.N:MPC8349CZUAGDB Desc:IC MPU POWERQUICC II PRO 672TBGA
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MPC8349EA PowerQUICC II Pro Integrated Host Processor Hardware Specifications, Rev. 13
Freescale Semiconductor
25
Ethernet: Three-Speed Ethernet, MII Management
Figure 10
shows the GMII receive AC timing diagram.
G
Figure 10. GMII Receive AC Timing Diagram
8.2.2
MII AC Timing Specifications
This section describes the MII transmit and receive AC timing specifications.
8.2.2.1
MII Transmit AC Timing Specifications
Table 27
provides the MII transmit AC timing specifications.
RX_CLK clock rise (20%–80%)
t
GRXR
—
—
1.0
ns
RX_CLK clock fall time (80%–20%)
t
GRXF
—
—
1.0
ns
Note:
1. The symbols for timing specifications follow the pattern of t
(first two letters of functional block)(signal)(state)(reference)(state)
for inputs
and t
(first two letters of functional block)(reference)(state)(signal)(state)
for outputs. For example, t
GRDVKH
symbolizes GMII receive timing
(GR) with respect to the time data input signals (D) reaching the valid state (V) relative to the t
RX
clock reference (K) going
to the high state (H) or setup time. Also, t
GRDXKL
symbolizes GMII receive timing (GR) with respect to the time data input
signals (D) went invalid (X) relative to the t
GRX
clock reference (K) going to the low (L) state or hold time. In general, the clock
reference symbol is based on three letters representing the clock of a particular function. For example, the subscript of t
GRX
represents the GMII (G) receive (RX) clock. For rise and fall times, the latter convention is used with the appropriate letter:
R (rise) or F (fall).
Table 27. MII Transmit AC Timing Specifications
At recommended operating conditions with LV
DD
/OV
DD
of 3.3 V ± 10%.
Parameter/Condition
Symbol
1
Min
Typ
Max
Unit
TX_CLK clock period 10 Mbps
t
MTX
—
400
—
ns
TX_CLK clock period 100 Mbps
t
MTX
—
40
—
ns
TX_CLK duty cycle
t
MTXH/
t
MTX
35
—
65
%
TX_CLK to MII data TXD[3:0], TX_ER, TX_EN delay
t
MTKHDX
1
5
15
ns
Table 26. GMII Receive AC Timing Specifications (continued)
At recommended operating conditions with LV
DD
/OV
DD
of 3.3 V ± 10%.
Parameter/Condition
Symbol
1
Min
Typ
Max
Unit
RX_CLK
RXD[7:0]
t
GRDXKH
t
GRX
t
GRXH
t
GRXR
t
GRXF
t
GRDVKH
RX_DV
RX_ER
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