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參數(shù)資料
| 型號： | MPC8245TZU300D |
| 廠商： | Freescale Semiconductor |
| 文件頁數(shù)： | 41/68頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC MPU 32BIT 300MHZ 352-TBGA |
| 標(biāo)準(zhǔn)包裝： | 24 |
| 系列： | MPC82xx |
| 處理器類型： | 32-位 MPC82xx PowerQUICC II |
| 速度： | 300MHz |
| 電壓： | 1.8V |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 352-LBGA |
| 供應(yīng)商設(shè)備封裝： | 352-TBGA（35x35） |
| 包裝： | 托盤 |
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MPC8245 Integrated Processor Hardware Specifications, Rev. 10
46
Freescale Semiconductor
System Design
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 via 1-k
Ω pull-down resistors to ensure a logic 0 level is
read into the configuration bits during reset if the default logic 1 level is not desired.
Any other unused active low input pins should be tied to a logic-one level through 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 through weak pull-down resistors (2–10 k
Ω).
7.5
PCI Reference Voltage—LVDD
The MPC8245 PCI reference voltage (LVDD) pins should be connected to a 3.3 ± 0.3 V power supply if
interfacing the MPC8245 into a 3.3-V PCI bus system. Similarly, the LVDD pins should be connected to
a 5.0 V ± 5% power supply if interfacing the MPC8245 into a 5-V PCI bus system. For either reference
voltage, the MPC8245 always performs 3.3-V signaling as described in the PCI Local Bus Specification
(Rev. 2.2). The MPC8245 tolerates 5-V signals when interfaced into a 5-V PCI bus system.
7.6
MPC8245 Compatibility with MPC8240
The MPC8245 AC timing specifications are backward-compatible with those of the MPC8240, except for
the requirements of item 11 in Table 10. Timing adjustments are needed as specified for Tos
(SDRAM_SYNC_IN to sys_logic_clk offset) time requirements.
The MPC8245 does not support the SDRAM flow-through memory interface.
The nominal core VDD power supply changes from 2.5 V on the MPC8240 to 1.8/2.0 V on the MPC8245.
See Table 2.
For example, the MPC8245 PLL_CFG[0:4] setting 0x02 (0b00010) has a different PCI-to-Mem and
Mem-to-CPU multiplier ratio than the same setting on the MPC8240, so it is not backward-compatible.
See Table 17.
Most of the MPC8240 PLL_CFG[0:4] settings are subsets of the PCI_SYNC_IN input frequency range
accepted by the MPC8245. However, the parts are not fully backward-compatible since the ranges of the
two parts do not always match. Modes 0x8 and 0x18 of the MPC8245 are not compatible with settings 0x8
Two reset configuration signals on the MPC8245 are not used as reset configuration signals on the
MPC8240: SDMA0 and SDMA1.
The SDMA0 reset configuration pin selects between the MPC8245 DUART and the MPC8240
backward-compatible mode PCI_CLK[0:4] functionality on these multiplexed signals. The default state
(logic 1) of SDMA0 selects the MPC8240 backward-compatible mode of PCI_CLK[0:4] functionality
while a logic 0 state on the SDMA0 signal selects DUART functionality. In DUART mode, four of the
five PCI clocks, PCI_CLK[0:3], are not available.
The SDMA1 reset configuration pin selects between MPC8245 extended ROM functionality and
MPC8240 backward-compatible functionality on the multiplexed signals: TBEN, CHKSTOP_IN,
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