参数资料
型号: MPC8379E-RDBA
厂商: Freescale Semiconductor
文件页数: 40/117页
文件大小: 0K
描述: BOARD REF DESIGN MPC8379E
标准包装: 1
系列: PowerQUICC II™ PRO
类型: MPU
适用于相关产品: MPC8379E
所含物品:
MPC8379E PowerQUICC II Pro Processor Hardware Specifications, Rev. 8
Freescale Semiconductor
29
This figure shows the RMII transmit AC timing diagram.
Figure 12. RMII Transmit AC Timing Diagram
8.2.3.2
RMII Receive AC Timing Specifications
This table shows the RMII receive AC timing specifications.
Fall time REF_CLK (80%–20%)
tRMTF
1.0
2.0
ns
REF_CLK to RMII data TXD[1:0], TX_EN delay
tRMTDX
2.0
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 30. 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
Table 29. RMII Transmit AC Timing Specifications (continued)
At recommended operating conditions with LVDD of 3.3 V ± 5%.
Parameter
Symbol1
Min
Typical
Max
Unit
REF_CLK
TXD[1:0]
tRMTDX
tRMT
tRMTH
tRMTR
tRMTF
TX_EN
TX_ER
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