mpc8349ea Freescale Semiconductor, Inc, mpc8349ea Datasheet - Page 23

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

At recommended operating conditions with LV
8.2.1.1
Table 24
Figure 8
Freescale Semiconductor
GTX_CLK clock period
GTX_CLK duty cycle
GTX_CLK to GMII data TXD[7:0], TX_ER, TX_EN delay
GTX_CLK clock rise time, V
GTX_CLK clock fall time, V
GTX_CLK125 clock period
GTX_CLK125 reference clock duty cycle measured at LV
Notes:
1. The symbols for timing specifications follow the pattern t
2. This symbol represents the external GTX_CLK125 signal and does not follow the original symbol naming convention.
t
with respect to the t
valid state (V) to state or setup time. Also, t
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
letter: R (rise) or F (fall).
(first two letters of functional block)(reference)(state)(signal)(state)
GTX
represents the GMII(G) transmit (TX) clock. For rise and fall times, the latter convention is used with the appropriate
shows the GMII transmit AC timing diagram.
provides the GMII transmit AC timing specifications.
MPC8349EA PowerQUICC™ II Pro Integrated Host Processor Hardware Specifications, Rev. 10
GMII Transmit AC Timing Specifications
GTX_CLK
Parameter/Condition
TXD[7:0]
TX_EN
TX_ER
GTX
clock reference (K) going to the high state (H) relative to the time date input signals (D) reaching the
IH
IL
(max) to V
(min) to V
Table 24. GMII Transmit AC Timing Specifications
Figure 8. GMII Transmit AC Timing Diagram
IH
IL
t
DD
GTXH
(min)
(max)
/OV
GTKHDX
DD
t
GTX
of 3.3 V ± 10%.
symbolizes GMII transmit timing (GT) with respect to the t
for outputs. For example, t
DD
(first two letters of functional block)(signal)(state)(reference)(state)
/2
t
t
G125H
t
GTXH
Symbol
GTXF
t
GTKHDX
t
t
t
G125
t
GTXR
GTXF
GTX
t
GTKHDX
/t
/t
GTX
G125
2
1
t
Ethernet: Three-Speed Ethernet, MII Management
GTXR
GTKHDV
43.75
Min
0.5
45
—
—
—
—
symbolizes GMII transmit timing (GT)
Typ
8.0
8.0
—
—
—
—
—
56.25
Max
5.0
1.0
1.0
—
—
55
GTX
for inputs and
clock
Unit
ns
ns
ns
ns
ns
%
%
23