參數(shù)資料
型號： MPC8545EPXAQGB
廠商： Freescale Semiconductor
文件頁數(shù)： 85/151頁
文件大?。?/td> 0K
描述： IC MPU POWERQUICC III 783FCPBGA
標準包裝： 1
系列： MPC85xx
處理器類型： 32-位 MPC85xx PowerQUICC III
速度： 1.0GHz
電壓： 1.1V
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
MPC8548E PowerQUICC III Integrated Processor Hardware Specifications, Rev. 9
Freescale Semiconductor
39
Enhanced Three-Speed Ethernet (eTSEC)
Figure 18 shows the RMII transmit AC timing diagram.
Figure 18. RMII Transmit AC Timing Diagram
8.2.7.2
RMII Receive AC Timing Specifications
TSECn_TX_CLK to RMII data TXD[1:0], TX_EN delay
tRMTDX
1.0
—
10.0
ns
Note:
1. The symbols used for timing specifications 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 35. RMII Receive AC Timing Specifications
Parameter/Condition
Symbol1
Min
Typ
Max
Unit
TSECn_TX_CLK clock period
tRMR
15.0
20.0
25.0
ns
TSECn_TX_CLK duty cycle
tRMRH
35
50
65
%
TSECn_TX_CLK peak-to-peak jitter
tRMRJ
——
250
ps
Rise time TSECn_TX_CLK(20%–80%)
tRMRR
1.0
—
2.0
ns
Fall time TSECn_TX_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 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 34. RMII Transmit AC Timing Specifications (continued)
Parameter/Condition
Symbol1
Min
Typ
Max
Unit
TSECn_TX_CLK
TXD[1:0]
tRMTDX
tRMT
tRMTH
tRMTR
tRMTF
TX_EN
TX_ER
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