參數(shù)資料
型號： MPC8379EVRALGA
廠商： FREESCALE SEMICONDUCTOR INC
元件分類： 微控制器/微處理器
英文描述： 32-BIT, 400 MHz, MICROPROCESSOR, PBGA689
封裝： 31 X 31 MM, 2.46 MM HEIGHT, 1 MM PITCH, LEAD FREE, PLASTIC, BGA-689
文件頁數(shù)： 37/114頁
文件大?。?/td> 1337K
代理商： MPC8379EVRALGA
MPC8379E PowerQUICC II Pro Processor Hardware Specifications, Rev. 2
Freescale Semiconductor
29
Ethernet: Enhanced Three-Speed Ethernet (eTSEC)
8.2.3.2
RMII Receive AC Timing Specifications
Table 29 shows the RMII receive AC timing specifications.
Figure 13 provides the AC test load for eTSEC.
Figure 13. eTSEC AC Test Load
Table 29. RMII Receive AC Timing Specifications
At recommended operating conditions with LVDD of 3.3 V ± 5%.
Parameter/Condition
Symbol1
Min
Typical
Max
Unit
Input low voltage at 3.3 LVDD
VIL
——
0.8
V
Input high voltage at 3.3 LVDD
VIH
2.0
—
V
REF_CLK clock period
tRMR
15.0
20.0
25.0
ns
REF_CLK duty cycle
tRMRH
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
RXD[1:0], CRS_DV, RX_ER hold time to REF_CLK rising edge
tRMRDX
2.0
—
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, tMRDVKH symbolizes MII
receive timing (MR) with respect to the time data input signals (D) reach the valid state (V) relative to the tMRX clock reference
(K) going to the high (H) state or setup time. Also, tMRDXKL symbolizes MII receive timing (GR) with respect to the time data
input signals (D) went invalid (X) relative to the tMRX clock reference (K) going to the low (L) state 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 tMRX represents the MII (M) receive (RX) clock. For rise and fall times, the latter convention is
used with the appropriate letter: R (rise) or F (fall).
Output
Z0 = 50 Ω
LVDD/2
RL = 50 Ω
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