參數(shù)資料
型號: MPC8347ZUAJDB
廠商: FREESCALE SEMICONDUCTOR INC
元件分類: 微控制器/微處理器
英文描述: 32-BIT, 533 MHz, MICROPROCESSOR, PBGA672
封裝: 35 X 35 MM, 1.46 MM HEIGHT, 1 MM PITCH, TBGA-672
文件頁數(shù): 17/98頁
文件大?。?/td> 1084K
代理商: MPC8347ZUAJDB
MPC8347EA PowerQUICC II Pro Integrated Host Processor Hardware Specifications, Rev. 11
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 8 shows the GMII transmit AC timing diagram.
Figure 8. GMII Transmit AC Timing Diagram
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
GTX_CLK125 clock period
tG125
2
—8.0
ns
GTX_CLK125 reference clock duty cycle measured at LVDD/2
tG125H/tG125
45
55
%
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).
2. This symbol represents the external GTX_CLK125 signal and does not follow the original symbol naming convention.
GTX_CLK
TXD[7:0]
tGTKHDX
tGTX
tGTXH
tGTXR
tGTXF
TX_EN
TX_ER
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