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| 型号： | KMPC8241LVR266D |
| 厂商： | Freescale Semiconductor |
| 文件页数： | 39/58页 |
| 文件大小： | 0K |
| 描述： | IC MPU 32BIT 266MHZ 357-PBGA |
| 标准包装： | 2 |
| 系列： | MPC82xx |
| 处理器类型： | 32-位 MPC82xx PowerQUICC II |
| 速度： | 266MHz |
| 电压： | 1.8V |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 357-BBGA |
| 供应商设备封装： | 357-PBGA（25x25） |
| 包装： | 托盘 |
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MPC8241 Integrated Processor Hardware Specifications, Rev. 10
44
Freescale Semiconductor
System Design Information
7.4
Pull-Up/Pull-Down Resistor Requirements
The data bus input receivers are normally turned off when no read operation is in progress; therefore, they
do not require pull-up resistors on the bus. The data bus signals are: MDH[0:31], MDL[0:31], and
PAR[0:7].
If the 32-bit data bus mode is selected, the input receivers of the unused data and parity bits (MDL[0:31]
and PAR[4:7]) are disabled, and their outputs drive logic zeros when they would otherwise be driven. For
this mode, these pins do not require pull-up resistors and should be left unconnected to minimize possible
output switching.
The TEST0 pin requires a pull-up resistor of 120
Ω or less connected to GVDD_OVDD.
RTC should have weak pull-up resistors (2–10 k
Ω) connected to GV
DD_OVDD and that the following
signals should be pulled up to GVDD_OVDD with weak pull-up resistors (2–10 kΩ): SDA, SCL, SMI,
SRESET/SDMA12, TBEN/SDMA13, CHKSTOP_IN/SDMA14, TRIG_IN/RCS2, QACK/DA0, and
DRDY.
The following PCI control signals should be pulled up to LVDD (the clamping voltage) with weak pull-up
resistors (2–10 k
Ω): DEVSEL, FRAME, IRDY, LOCK, PERR, SERR, STOP, and TRDY. The resistor
values may need to have stronger adjustment to reduce induced noise on specific board designs.
The following pins have internal pull-up resistors enabled at all times: REQ[3:0], REQ4/DA4, TCK, TDI,
TMS, and TRST. See Table 16.
The following pins have internal pull-up resistors that are enabled only while the device is in the reset state:
GNT4/DA5, MDL0, FOE, RCS0, SDRAS, SDCAS, CKE, AS, MCP, MAA[0:2], and PMAA[0:2]. See
The following pins are reset configuration pins: GNT4/DA5, MDL[0], FOE, RCS0, CKE, AS, MCP,
QACK/DA0, MAA[0:2], PMAA[0:2], SDMA[1:0], MDH[16:31], and PLL_CFG[0:4]/DA[10:15]. These
pins are sampled during reset to configure the device. The PLL_CFG[0:4] signals are sampled a few clocks
after the negation of HRST_CPU and HRST_CTRL.
Reset configuration pins should be tied to GND by means of 1-k
Ω pull-down resistors to ensure that a logic
zero level is read into the configuration bits during reset if the default logic-one level is not desired.
Any other unused active low input pins should be tied to a logic-one level by means of weak pull-up
resistors (2–10 k
Ω) to the appropriate power supply listed in Table 16. Unused active high input pins
should be tied to GND by means of weak pull-down resistors (2–10 k
Ω).
7.5
PCI Reference Voltage—LVDD
The MPC8241 PCI reference voltage (LVDD) pins should be connected to 3.3 ± 0.3 V power supply if
interfacing the MPC8241 into a 3.3-V PCI bus system. Similarly, the LVDD pins should be connected to
5.0 V ± 5% power supply if interfacing the MPC8241 into a 5-V PCI bus system. For either reference
voltage, the MPC8241 always performs 3.3-V signaling as described in the PCI Local Bus Specification
(Rev. 2.2). The MPC8241 tolerates 5-V signals when interfaced into a 5-V PCI bus system. (See Errata
No. 18 in the MPC8245/MPC8241 Integrated Processor Chip Errata).
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