MPC8347 FREESCALE [Freescale Semiconductor, Inc], MPC8347 Datasheet - Page 26

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

Ethernet: Three-Speed Ethernet, MII Management
8.2
The AC timing specifications for GMII, MII, TBI, RGMII, and RTBI are presented in this section.
8.2.1
This section describes the GMII transmit and receive AC timing specifications.
8.2.1.1
Table 24
Figure 7
26
At recommended operating conditions with LV
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.
and t
timing (GT) with respect to the t
(D) reaching the valid state (V) to state or setup time. Also, t
to the t
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
convention is used with the appropriate letter: R (rise) or F (fall).
(first two letters of functional block)(reference)(state)(signal)(state)
shows the GMII transmit AC timing diagram.
provides the GMII transmit AC timing specifications.
GMII, MII, TBI, RGMII, and RTBI AC Timing Specifications
GTX
GMII Timing Specifications
MPC8347EA PowerQUICC II Pro Integrated Host Processor Hardware Specifications, Rev. 3
GMII Transmit AC Timing Specifications
clock reference (K) going to the high state (H) relative to the time date input signals (D) going invalid (X) or
GTX_CLK
TXD[7:0]
TX_EN
TX_ER
Parameter/Condition
IH
IL
(max) to V
(min) to V
Table 24. GMII Transmit AC Timing Specifications
GTX
GTX
Figure 7. GMII Transmit AC Timing Diagram
t
represents the GMII(G) transmit (TX) clock. For rise and fall times, the latter
GTXH
DD
clock reference (K) going to the high state (H) relative to the time date input signals
IH
IL
(min)
/ OV
(max)
t
GTX
DD
of 3.3 V ± 10%.
DD
(first two letters of functional block)(signal)(state) (reference)(state)
/ 2
for outputs. For example, t
GTKHDX
t
GTXF
t
G125H
t
Symbol
GTXH
t
t
t
GTKHDX
t
t
G125
GTKHDX
t
GTXR
GTXF
GTX
symbolizes GMII transmit timing (GT) with respect
/t
/t
GTX
G125
2
1
t
GTXR
43.75
Min
0.5
45
—
—
—
—
GTKHDV
Typ
8.0
8.0
symbolizes GMII transmit
—
—
—
—
—
Freescale Semiconductor
56.25
Max
5.0
1.0
1.0
55
—
—
for inputs
Unit
ns
ns
ns
ns
ns
%
%