参数资料
型号: MPC8245LZU266B
厂商: MOTOROLA INC
元件分类: 微控制器/微处理器
英文描述: 32-BIT, 266 MHz, RISC PROCESSOR, PBGA352
封装: 35 X 35 MM, 1.65 MM HEIGHT, 1.27 MM PITCH, CAVITY-UP, TBGA-352
文件页数: 22/64页
文件大小: 940K
代理商: MPC8245LZU266B
MOTOROLA
MPC8245 Integrated Processor Hardware Specifications
29
Electrical and Thermal Characteristics
1.4.3.5
PIC Serial Interrupt Mode AC Timing Specifications
Table 15 provides the PIC serial interrupt mode AC timing specifications for the MPC8245 at recommended
operating conditions (see Table 2) with GVDD = 3.3 V ± 5% and LVDD = 3.3 V ± 0.3 V.
Figure 20. PIC Serial Interrupt Mode Output Timing Diagram
Table 15. PIC Serial Interrupt Mode AC Timing Specifications
Num
Characteristic
Min
Max
Unit
Notes
1
S_CLK frequency
1/14 SDRAM_SYNC_IN
1/2 SDRAM_SYNC_IN
MHz
1
2
S_CLK duty cycle
40
60
%
3
S_CLK output valid time
6
ns
4
Output hold time
0
ns
5S_FRAME, S_RST output valid time
1 sys_logic_clk period + 6
ns
2
6
S_INT input setup time to S_CLK
1 sys_logic_clk period + 2
ns
2
7
S_INT inputs invalid (hold time) to
S_CLK
—0
ns
2
Notes:
1. See the MPC8245 Integrated Processor User’s Manual for a description of the PIC interrupt control register (ICR)
describing S_CLK frequency programming.
2. S_RST, S_FRAME, and S_INT shown in Figure 20 and Figure 21, depict timing relationships to sys_logic_clk and
S_CLK and do not describe functional relationships between S_RST, S_FRAME, and S_INT. See the MPC8245
Integrated Processor User’s Manual for a complete description of the functional relationships between these
signals.
3. The sys_logic_clk waveform is the clocking signal of the internal peripheral logic from the output of the peripheral
logic PLL; sys_logic_clk is the same as SDRAM_SYNC_IN when the SDRAM_SYNC_OUT to SDRAM_SYNC_IN
feedback loop is implemented and the DLL is locked. See the MPC8245 Integrated Processor User’s Manual for a
complete clocking description.
S_CLK
S_RST
VM
S_FRAME
sys_logic_clk
VM
4
3
5
4
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