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| 型號(hào)： | MPC8569VTANKGB |
| 廠商： | FREESCALE SEMICONDUCTOR INC |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | RISC PROCESSOR, PBGA783 |
| 封裝： | 29 X 29 MM, 1 MM PITCH, PLASTIC, BGA-783 |
| 文件頁(yè)數(shù)： | 67/126頁(yè) |
| 文件大小： | 2847K |
| 代理商： | MPC8569VTANKGB |
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DDR2 and DDR3 SDRAM Controller
MPC8569E PowerQUICC III Integrated Processor Hardware Specifications, Rev. 0
Freescale Semiconductor
45
2.3.2
Real Time Clock Timing
The real time clock timing (RTC) input is sampled by the core complex bus clock (CCB_clk). The output of the sampling latch
is then used as an input to the counters of the PIC and the time base unit of the e500; there is no need for jitter specification.
The minimum pulse width of the RTC signal must be greater than 2x the period of the CCB_clk. That is, minimum clock high
time is 2
× tCCB_clk, and minimum clock low time is 2 × tCCB_clk. There is no minimum RTC frequency; RTC may be grounded
if not needed.
2.3.3
Gigabit Ethernet Reference Clock Timing
The following table provides the gigabit Ethernet reference clock (TX_CLK) AC timing specifications.
2.3.4
Other Input Clocks
A description of the overall clocking of this device is available in the MPC8569E PowerQUICC III Integrated Host Processor
Family Reference Manual in the form of a clock subsystem block diagram. For information about the input clock requirements
of other functional blocks such as SerDes, Ethernet Management, eSDHC, and Enhanced Local Bus see the specific interface
section.
2.4
DDR2 and DDR3 SDRAM Controller
This section describes the DC and AC electrical specifications for the DDR2 and DDR3 SDRAM controller interface of the
MPC8569E. Note that the required GVDD(typ) is 1.8 V for DDR2 SDRAM and GVDD(typ) is 1.5 V for DDR3 SDRAM.
Table 12. TX_CLK3,4 AC Timing Specifications
At recommended operating conditions with LVDD = 2.5 V ± 125 mV / 3.3 V ± 165 mV.
Parameter/Condition
Symbol
Min
Typical
Max
Unit
Notes
TX_CLK frequency
tG125
—125
—
MHz
—
TX_CLK cycle time
tG125
—8
—
ns
—
TX_CLK rise and fall time
LVDD = 2.5 V
LVDD = 3.3 V
tG125R/tG125F
——
0.75
1.0
ns
1, 5
TX_CLK duty cycle
GMII, TBI
1000Base-T for RGMII, RTBI
tG125H/tG125
45
47
—
55
53
%2, 5
TX_CLK jitter
—
± 150
ps
2, 5
Notes:
1. Rise and fall times for TX_CLK are measured from 0.5 and 2.0 V for LVDD = 2.5 V, and from 0.6 and 2.7 V for LVDD =3.3 V.
2. TX_CLK is used to generate the GTX clock for the UEC transmitter with 2% degradation. The TX_CLK duty cycle can be
loosened from 47%/53% as long as the PHY device can tolerate the duty cycle generated by the UEC GTX_CLK. See
Section 2.6.3.7, “RGMII and RTBI AC Timing Specifications,” for duty cycle for 10Base-T and 100Base-T reference clock.
3. Gigabit transmit 125-MHz source. This signal must be generated externally with a crystal or oscillator, or is sometimes
provided by the PHY. TX_CLK is a 125-MHz input into the UCC Ethernet Controller and is used to generate all 125-MHz
related signals and clocks in the following modes: GMII, TBI, RTBI, RGMII.
4. For GMII and TBI modes, TX_CLK is provided to UCC1 through QE_PC[8:11,14,15] (CLK9-12,15,16) and to UCC2 through
QE_PC[2,3,6,7,15:17](CLK3,4,7,8,16:18). For RGMII and RTBI modes, TX_CLK is provided to UCC1 and UCC3 through
QE_PC11(CLK12) and to UCC2 and UCC4 through QE_PC16 (CLK17).
5. System/board must be designed to ensure the input requirement to the device is achieved. Proper device operation is
guaranteed for inputs meeting this requirement by design, simulation, characterization, or functional testing
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