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1500457 Datasheet(PDF) 24 Page - Freescale Semiconductor, Inc

Part No. 1500457
Description  Integrated Host Processor Hardware Specifications
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Maker  FREESCALE [Freescale Semiconductor, Inc]
Homepage  http://www.freescale.com
Logo FREESCALE - Freescale Semiconductor, Inc

1500457 Datasheet(HTML) 24 Page - Freescale Semiconductor, Inc

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MPC8349EA PowerQUICC II Pro Integrated Host Processor Hardware Specifications, Rev. 13
24
Freescale Semiconductor
Ethernet: Three-Speed Ethernet, MII Management
8.2.1.1
GMII Transmit AC Timing Specifications
Table 25 provides the GMII transmit AC timing specifications.
Figure 9 shows the GMII transmit AC timing diagram.
Figure 9. GMII Transmit AC Timing Diagram
8.2.1.2
GMII Receive AC Timing Specifications
Table 26 provides the GMII receive AC timing specifications.
Table 25. GMII Transmit AC Timing Specifications
At recommended operating conditions with LVDD/OVDD of 3.3 V ± 10%.
Parameter/Condition
Symbol1
Min
Typ
Max
Unit
GTX_CLK clock period
tGTX
—8.0
ns
GTX_CLK duty cycle
tGTXH/tGTX
43.75
56.25
%
GTX_CLK to GMII data TXD[7:0], TX_ER, TX_EN delay
tGTKHDX
0.5
5.0
ns
GTX_CLK clock rise time (20%–80%)
tGTXR
——
1.0
ns
GTX_CLK clock fall time (80%–20%)
tGTXF
——
1.0
ns
Notes:
1. The symbols for timing specifications follow the pattern 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, tGTKHDV symbolizes GMII transmit timing (GT)
with respect to the tGTX clock reference (K) going to the high state (H) relative to the time date input signals (D) reaching the
valid state (V) to state or setup time. Also, tGTKHDX symbolizes GMII transmit timing (GT) with respect to the tGTX clock
reference (K) going to the high state (H) relative to the time date input signals (D) going invalid (X) 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 tGTX represents the GMII(G) transmit (TX) clock. For rise and fall times, the latter convention is used with the appropriate
letter: R (rise) or F (fall).
Table 26. GMII Receive AC Timing Specifications
At recommended operating conditions with LVDD/OVDD of 3.3 V ± 10%.
Parameter/Condition
Symbol1
Min
Typ
Max
Unit
RX_CLK clock period
tGRX
—8.0
ns
RX_CLK duty cycle
tGRXH/tGRX
40
60
%
RXD[7:0], RX_DV, RX_ER setup time to RX_CLK
tGRDVKH
2.0
ns
RXD[7:0], RX_DV, RX_ER hold time to RX_CLK
tGRDXKH
0.5
ns
GTX_CLK
TXD[7:0]
tGTKHDX
tGTX
tGTXH
tGTXR
tGTXF
TX_EN
TX_ER


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