參數(shù)資料
型號(hào)： MPC8349ECZUAJDB
廠商： FREESCALE SEMICONDUCTOR INC
元件分類： 微控制器/微處理器
英文描述： 32-BIT, 533 MHz, MICROPROCESSOR, PBGA672
封裝： 35 X 35 MM, 1.46 MM HEIGHT, 1 MM PITCH, TBGA-672
文件頁(yè)數(shù)： 18/87頁(yè)
文件大小： 1037K
代理商： MPC8349ECZUAJDB
MPC8349EA PowerQUICC II Pro Integrated Host Processor Hardware Specifications, Rev. 12
Freescale Semiconductor
25
Ethernet: Three-Speed Ethernet, MII Management
8.2.1.2
GMII Receive AC Timing Specifications
Table 26 provides the GMII receive AC timing specifications.
Figure 9 shows the GMII receive AC timing diagram.
G
Figure 9. GMII Receive AC Timing Diagram
Table 26. GMII Receive AC Timing Specifications
At recommended operating conditions with LVDD/OVDD of 3.3 V ± 10%.
Parameter/Condition
Symbol1
Min
Typ
Max
Unit
RX_CLK clock period
tGRX
—8.0
—
ns
RX_CLK duty cycle
tGRXH/tGRX
40
—
60
%
RXD[7:0], RX_DV, RX_ER setup time to RX_CLK
tGRDVKH
2.0
—
ns
RXD[7:0], RX_DV, RX_ER hold time to RX_CLK
tGRDXKH
0.5
—
ns
RX_CLK clock rise (20%–80%)
tGRXR
——
1.0
ns
RX_CLK clock fall time (80%–20%)
tGRXF
——
1.0
ns
Note:
1. The symbols 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, tGRDVKH symbolizes GMII receive timing
(GR) with respect to the time data input signals (D) reaching the valid state (V) relative to the tRX clock reference (K) going
to the high state (H) or setup time. Also, tGRDXKL symbolizes GMII receive timing (GR) with respect to the time data input
signals (D) went invalid (X) relative to the tGRX clock reference (K) going to the low (L) state or hold time. In general, the clock
reference symbol is based on three letters representing the clock of a particular function. For example, the subscript of tGRX
represents the GMII (G) receive (RX) clock. For rise and fall times, the latter convention is used with the appropriate letter:
R (rise) or F (fall).
RX_CLK
RXD[7:0]
tGRDXKH
tGRX
tGRXH
tGRXR
tGRXF
tGRDVKH
RX_DV
RX_ER
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