參數(shù)資料
型號: MPC8379E-RDBA
廠商: Freescale Semiconductor
文件頁數(shù): 37/117頁
文件大?。?/td> 0K
描述: BOARD REF DESIGN MPC8379E
標(biāo)準(zhǔn)包裝: 1
系列: PowerQUICC II™ PRO
類型: MPU
適用于相關(guān)產(chǎn)品: MPC8379E
所含物品:
MPC8379E PowerQUICC II Pro Processor Hardware Specifications, Rev. 8
26
Freescale Semiconductor
This figure provides the AC test load for eTSEC.
Figure 8. eTSEC AC Test Load
This figure shows the MII receive AC timing diagram.
Figure 9. MII Receive AC Timing Diagram
8.2.2
RGMII and RTBI AC Timing Specifications
This table presents the RGMII and RTBI AC timing specifications.
RX_CLK clock rise time (20%–80%)
tMRXR
1.0
4.0
ns
RX_CLK clock fall time (80%–20%)
tMRXF
1.0
4.0
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).
Table 28. RGMII and RTBI AC Timing Specifications
At recommended operating conditions with LVDD of 2.5 V ± 5%.
Parameter
Symbol1
Min
Typical
Max
Unit
Note
Data to clock output skew (at transmitter)
tSKRGT
–600
0
600
ps
Data to clock input skew (at receiver)
tSKRGT
1.0
2.8
ns
Clock period
tRGT
7.2
8.0
8.8
ns
Table 27. MII Receive AC Timing Specifications (continued)
At recommended operating conditions with LVDD of 3.3 V ± 5%.
Parameter
Symbol1
Min
Typical
Max
Unit
Output
Z0 = 50 Ω
LVDD/2
RL = 50 Ω
RX_CLK
RXD[3:0]
tMRDXKL
tMRX
tMRXH
tMRXR
tMRXF
RX_DV
RX_ER
tMRDVKH
Valid Data
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