參數(shù)資料
型號: KMPC8541PXAPF
廠商: Freescale Semiconductor
文件頁數(shù): 16/88頁
文件大?。?/td> 0K
描述: IC MPU POWERQUICC III 783-FCPBGA
標準包裝: 2
系列: MPC85xx
處理器類型: 32-位 MPC85xx PowerQUICC III
速度: 833MHz
電壓: 1.2V
安裝類型: 表面貼裝
封裝/外殼: 783-BBGA,F(xiàn)CBGA
供應商設備封裝: 783-FCPBGA(29x29)
包裝: 托盤
MPC8541E PowerQUICC III Integrated Communications Processor Hardware Specification, Rev. 4.2
Freescale Semiconductor
23
Ethernet: Three-Speed, MII Management
8.2
GMII, MII, TBI, RGMII, and RTBI AC Timing Specifications
The AC timing specifications for GMII, MII, TBI, RGMII, and RTBI are presented in this section.
8.2.1
GMII AC Timing Specifications
This section describes the GMII transmit and receive AC timing specifications.
8.2.2
GMII Transmit AC Timing Specifications
Table 20 provides the GMII transmit AC timing specifications.
Figure 7 shows the GMII transmit AC timing diagram.
Figure 7. GMII Transmit AC Timing Diagram
Table 20. GMII Transmit AC Timing Specifications
At recommended operating conditions with LVDD of 3.3 V ± 5%.
Parameter/Condition
Symbol 1
Min
Typ
Max
Unit
GTX_CLK clock period
tGTX
—8.0
ns
GTX_CLK duty cycle
tGTXH/tGTX
40
60
%
GMII data TXD[7:0], TX_ER, TX_EN setup time
tGTKHDV
2.5
——ns
GTX_CLK to GMII data TXD[7:0], TX_ER, TX_EN delay
tGTKHDX
0.5
5.0
ns
GTX_CLK data clock rise and fall times
tGTXR
3
, tGTXR
2,4
——
1.0
ns
Notes:
1. The symbols used for timing specifications herein 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. Note that, in general, the clock reference symbol representation is based on three letters representing the clock of a
particular functional. 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. Signal timings are measured at 0.7 V and 1.9 V voltage levels.
3. Guaranteed by characterization.
4. Guaranteed by design.
GTX_CLK
TXD[7:0]
tGTKHDX
tGTX
tGTXH
tGTXR
tGTXF
tGTKHDV
TX_EN
TX_ER
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