Hotenda MPC8349EA, Технические данные инструкция

Страница: 24 / 87

Electronic Component Distributor. Source::Freescale Semiconductor
P.N:MPC8349CZUAGDB Desc:IC MPU POWERQUICC II PRO 672TBGA
Web:http://www.hotenda.cn E-mail:sales@hotenda.cn Phone:(+86) 075583794354
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 LV
DD
/OV
DD
of 3.3 V ± 10%.
Parameter/Condition Symbol
1
Min Typ Max Unit
GTX_CLK clock period t
GTX
— 8.0 — ns
GTX_CLK duty cycle t
GTXH
/t
GTX
43.75 — 56.25 %
GTX_CLK to GMII data TXD[7:0], TX_ER, TX_EN delay t
GTKHDX
0.5 — 5.0 ns
GTX_CLK clock rise time (20%–80%) t
GTXR
— — 1.0 ns
GTX_CLK clock fall time (80%–20%) t
GTXF
— — 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, t
GTKHDV
symbolizes GMII transmit timing (GT)
with respect to the t
GTX
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, t
GTKHDX
symbolizes GMII transmit timing (GT) with respect to the t
GTX
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 t
GTX
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 LV
DD
/OV
DD
of 3.3 V ± 10%.
Parameter/Condition Symbol
1
Min Typ Max Unit
RX_CLK clock period t
GRX
— 8.0 — ns
RX_CLK duty cycle t
GRXH
/t
GRX
40 — 60 %
RXD[7:0], RX_DV, RX_ER setup time to RX_CLK t
GRDVKH
2.0 — — ns
RXD[7:0], RX_DV, RX_ER hold time to RX_CLK t
GRDXKH
0.5 — — ns
GTX_CLK
TXD[7:0]
t
GTKHDX
t
GTX
t
GTXH
t
GTXR
t
GTXF
TX_EN
TX_ER
24 / 87