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MOTOROLA
MPC8241 Integrated Processor Hardware Specifications
15
Electrical and Thermal Characteristics
DLL locking range loop delay vs. frequency of operation.
Figure 6. PCI_SYNC_IN Input Clock Timing Diagram
graphs define the areas of DLL locking for various modes. The grey areas represent where the DLL will
lock.
21
OSC_IN frequency stability
—
100
ppm
Notes:
1. Rise and fall times for the PCI_SYNC_IN input are measured from 0.4 to 2.4 V.
2. Specification value at maximum frequency of operation.
3. Pin-to-pin skew includes quantifying the additional amount of clock skew (or jitter) from the DLL besides any
intentional skew added to the clocking signals from the variable length DLL synchronization feedback loop, that is,
the amount of variance between the internal sys_logic_clk and the SDRAM_SYNC_IN signal after the DLL is
locked. While pin-to-pin skew between SDRAM_CLKs can be measured, the relationship between the internal
sys_logic_clk and the external SDRAM_SYNC_IN cannot be measured and is guaranteed by design.
4. Relock time is guaranteed by design and characterization. Relock time is not tested.
5. Relock timing is guaranteed by design. PLL-relock time is the maximum amount of time required for PLL lock after
a stable VDD and PCI_SYNC_IN are reached during the reset sequence. This specification also applies when the
PLL has been disabled and subsequently re-enabled during sleep mode. Also note that HRST_CPU/HRST_CTRL
must be held asserted for a minimum of 255 bus clocks after the PLL-relock time during the reset sequence.
6. DLL_EXTEND is bit 7 of the PMC2 register <72>. N is a non-zero integer (see Figure 7 through Figure 10). Tclk is
the period of one SDRAM_SYNC_OUT clock cycle in ns. Tloop is the propagation delay of the DLL synchronization
feedback loop (PC board runner) from SDRAM_SYNC_OUT to SDRAM_SYNC_IN in ns; 6.25 inches of loop length
(unloaded PC board runner) corresponds to approximately 1 ns of delay. Tdp(max) and Tdp(min) are dependent on
tap delay. See Table 9 for values of Tdp(max) and Tdp(min). See Figure 7 through Figure 10 for DLL locking ranges.
Refer to Motorola Application Note AN2164, MPC8245/MPC8241 Memory Clock Design Guidelines, for more
details on memory clock design.
7. Rise and fall times for the OSC_IN input is guaranteed by design and characterization. OSC_IN input rise and fall
times are not tested.
Table 9. Tdp(min) and Tdp(max)
Mode
Tdp(min)
Tdp(max)
Unit
Normal tap delay: bit 2 (DLL_MAX_DELAY) at offset 0x76 is cleared
7.58
12.97
ns
Maximum tap delay: bit 2 (DLL_MAX_DELAY) at offset 0x76 is set
8.28
17.57
ns
Table 8. Clock AC Timing Specifications (continued)
At recommended operating conditions (see Table 2) with LVDD = 3.3 V ± 0.3 V
Num
Characteristics and Conditions
Min
Max
Unit
Notes
5a
5b
VM
VM = Midpoint Voltage (1.4 V)
2
3
CVIL
CVIH
1
PCI_SYNC_IN
VM
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| MPC8241LZQ166D | 功能描述:微處理器 - MPU 166MHz 315.4MIPS RoHS:否 制造商:Atmel 處理器系列:SAMA5D31 核心:ARM Cortex A5 數(shù)據(jù)總線寬度:32 bit 最大時鐘頻率:536 MHz 程序存儲器大小:32 KB 數(shù)據(jù) RAM 大小:128 KB 接口類型:CAN, Ethernet, LIN, SPI,TWI, UART, USB 工作電源電壓:1.8 V to 3.3 V 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:FBGA-324 |
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