参数资料
型号: MPC8540VT833JB
厂商: FREESCALE SEMICONDUCTOR INC
元件分类: 微控制器/微处理器
英文描述: 32-BIT, 667 MHz, MICROPROCESSOR, PBGA783
封装: 29 X 29 MM, 3.75 MM HEIGHT, 1 MM PITCH, LEAD FREE, FLIP CHIP, PLASTIC, BGA-783
文件页数: 22/104页
文件大小: 1216K
代理商: MPC8540VT833JB
MPC8540 Integrated Processor Hardware Specifications, Rev. 4.1
24
Freescale Semiconductor
Ethernet: Three-Speed,10/100, MII Management
Figure 7 shows the GMII transmit AC timing diagram.
Figure 7. GMII Transmit AC Timing Diagram
8.2.1.2
GMII Receive AC Timing Specifications
Table 24 provides the GMII receive AC timing specifications.
GTX_CLK data clock rise and fall time
tGTXR, tGTXF
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.
Table 24. GMII Receive AC Timing Specifications
At recommended operating conditions with LVDD of 3.3 V ± 5%, or LVDD=2.5V ± 5%.
Parameter/Condition
Symbol 1
Min
Typ
Max
Unit
RX_CLK clock period
tGRX
—8.0
ns
RX_CLK duty cycle
tGRXH/tGRX
40
60
ns
RXD[7:0], RX_DV, RX_ER setup time to RX_CLK
tGRDVKH
2.0
ns
RXD[7:0], RX_DV, RX_ER hold time to RX_CLK
tGRDXKH
0.5
ns
Table 23. GMII Transmit AC Timing Specifications (continued)
At recommended operating conditions with LVDD of 3.3 V ± 5%, or LVDD=2.5V ± 5%.
Parameter/Condition
Symbol 1
Min
Typ
Max
Unit
GTX_CLK
TXD[7:0]
tGTKHDX
tGTX
tGTXH
tGTXR
tGTXF
tGTKHDV
TX_EN
TX_ER
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