参数资料
型号: MPC8255ZULHDX
厂商: MOTOROLA INC
元件分类: 微控制器/微处理器
英文描述: 32-BIT, 250 MHz, RISC PROCESSOR, PBGA480
封装: 37.50 X 37.50 MM, 1.55 MM HEIGHT, 1.27 MM PITCH, TBGA-480
文件页数: 8/36页
文件大小: 683K
代理商: MPC8255ZULHDX
16
MPC8255 Hardware Specifications
MOTOROLA
PRELIMINARY—SUBJECT TO CHANGE WITHOUT NOTICE
Clock Configuration Modes
Figure 11 is a graphical representation of Table 11.
Figure 11. Internal Tick Spacing for Memory Controller Signals
NOTE
The UPM machine outputs change on the internal tick determined by the
memory controller programming; the AC specifications are relative to the
internal tick. Note that SDRAM and GPCM machine outputs change on
CLKin’s rising edge.
1.3
Clock Configuration Modes
To configure the main PLL multiplication factor and the core, CPM, and 60x bus frequencies, the
MODCK[1–3] pins are sampled while HRESET is asserted. Table 12 shows the eight basic configuration
modes. Another 49 modes are available by using the configuration pin (RSTCONF) and driving four pins
on the data bus.
1.3.1
Local Bus Mode
Table 12 describes default clock modes for the MPC8255.
Table 11. Tick Spacing for Memory Controller Signals
PLL Clock Ratio
Tick Spacing (T1 Occurs at the Rising Edge of CLKin)
T2
T3
T4
1:2, 1:3, 1:4, 1:5, 1:6
1/4 CLKin
1/2 CLKin
3/4 CLKin
1:2.5
3/10 CLKin
1/2 CLKin
8/10 CLKin
1:3.5
4/14 CLKin
1/2 CLKin
11/14 CLKin
CLKin
T1
T2
T3
T4
CLKin
T1
T2
T3
T4
for 1:2.5
for 1:3.5
CLKin
T1
T2
T3
T4
for 1:2, 1:3, 1:4, 1:5, 1:6
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