參數(shù)資料
型號： MC8640HX1250HE
廠商： FREESCALE SEMICONDUCTOR INC
元件分類： 微控制器/微處理器
英文描述： 32-BIT, 1250 MHz, MICROPROCESSOR, CBGA1023
封裝： 33 X 33 MM, CERAMIC, FCBGA-1023
文件頁數(shù)： 64/130頁
文件大小： 1495K
代理商： MC8640HX1250HE
MPC8640 and MPC8640D Integrated Host Processor Hardware Specifications, Rev. 3
Freescale Semiconductor
39
Ethernet: Enhanced Three-Speed Ethernet (eTSEC), MII Management
Figure 20 shows the RMII transmit AC timing diagram.
Figure 20. RMII Transmit AC Timing Diagram
8.2.7.2
RMII Receive AC Timing Specifications
Table 37 shows the RMII receive AC timing specifications.
REF_CLK to RMII data TXD[1:0], TX_EN delay
tRMTDX
1.0
—
10.0
ns
Note:
1. The symbols used for timing specifications herein follow the pattern of 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, tMTKHDX symbolizes MII
transmit timing (MT) for the time tMTX clock reference (K) going high (H) until data outputs (D) are invalid (X). Note that, in
general, the clock reference symbol representation is based on two to three letters representing the clock of a particular
functional. For example, the subscript of tMTX represents the MII(M) transmit (TX) clock. For rise and fall times, the latter
convention is used with the appropriate letter: R (rise) or F (fall).
Table 37. RMII Receive AC Timing Specifications
At recommended operating conditions with L/TVDD of 3.3 V ± 5%.
Parameter
Symbol1
Min
Typ
Max
Unit
REF_CLK clock period
tRMR
15.0
20.0
25.0
ns
REF_CLK duty cycle
tRMRH/tRMR
35
50
65
%
REF_CLK peak-to-peak jitter
tRMRJ
—
250
ps
Rise time REF_CLK (20%–80%)
tRMRR
1.0
—
2.0
ns
Fall time REF_CLK (80%–20%)
tRMRF
1.0
—
2.0
ns
RXD[1:0], CRS_DV, RX_ER setup time to REF_CLK rising edge
tRMRDV
4.0
—
ns
Table 36. RMII Transmit AC Timing Specifications (continued)
At recommended operating conditions with L/TVDD of 3.3 V ± 5%.
Parameter
Symbol 1
Min
Typ
Max
Unit
REF_CLK
TXD[1:0]
tRMTDX
tRMT
tRMTH
tRMTR
tRMTF
TX_EN
TX_ER
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