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| 型号： | IBM25PPC750FX-DB1013T |
| 元件分类： | 微控制器/微处理器 |
| 英文描述： | 32-BIT, 733 MHz, RISC PROCESSOR, CBGA292 |
| 封装： | 21 X 21 MM, 1 MM PITCH, CERAMIC, BGA-292 |
| 文件页数： | 46/62页 |
| 文件大小： | 452K |
| 代理商： | IBM25PPC750FX-DB1013T |
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DD 2.X
PowerPC 750FX RISC Microprocessor
Preliminary
5. System Design Information
Page 48 of 63
Body_750FX_DS_DD2.X.fm.2.0
June 9, 2003
5.5 Level Protection
A level protection feature is included in the PowerPC 750FX RISC Microprocessor. The level protection
feature is available in the 1.8V, 2.5V, and 3.3V bus modes. This feature prevents ambiguous floating refer-
ence voltages by pulling the respective signal line to the last valid or nearest valid state.
For example, if the Input/Output voltage level is closer to OVDD, the circuit pulls the I/O level to OVDD. If the I/O
level is closer to GND, the I/O level is pulled low. This self-latching circuitry keeps the floating inputs defined
and avoids meta-stability. In Table 5-6 Input-Output Usage on page 44, these signals are defined as keeper
in the Level Protect column.
Keepers are not intended to force a net to a particular state. The keeper supplies a small (100
A max.)
amount of current, which is intended to help keep a net at the current logic state.
The level protect circuitry provides no additional leakage current to the signal I/O; however, some amount of
current must be applied to the keeper node to overcome the level protection latch. This current is process
dependent, but in no case is the current required over 100
A.
This feature allows the system designer to limit the number of resistors in the design and optimize placement
and reduce costs.
Note: Having a level protection (keeper) on the associated signal I/O does not replace a pull-up or pull-down
resistor that is needed by the 750FX or a separate device located on the 60x bus. The designer must supply
any such resisters.
Figure 5-7. IBM RISCWatchTM JTAG to HRESET, TRST, and SRESET Signal Connector
Note: See notes for Table 5-6 Input-Output Usage on page 44.
HRESET from RISCWatch
System HRESET
HRESET to PowerPC 750FX
TRST to PowerPC 750FX
SRESET to PowerPC 750FX
SRESET from RISCWatch
System SRESET
TRST from RISCWatch
相关PDF资料 |
PDF描述 |
|---|---|
| IBM25PPC750FX-GB0112T | 32-BIT, 600 MHz, RISC PROCESSOR, CBGA292 |
| IBM25PPC750FX-DB0513T | 32-BIT, 700 MHz, RISC PROCESSOR, CBGA292 |
| IBM25PPC750FX-FB0533T | 32-BIT, 700 MHz, RISC PROCESSOR, CBGA292 |
| IBM25PPC750FX-FB0112T | 32-BIT, 600 MHz, RISC PROCESSOR, CBGA292 |
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相关代理商/技术参数 |
参数描述 |
|---|---|
| IBM25PPC750FX-FB1013T | 制造商:IBM 功能描述:32-BIT, 733 MHZ, RISC PROCESSOR, CBGA292 |
| IBM25PPC750FX-FB2513T | 制造商:IBM 功能描述:32-BIT, 800 MHz, RISC PROCESSOR, CBGA292 |
| IBM25PPC750FX-GB0122V | 制造商:IBM 功能描述:MPU 750XX RISC 32BIT - Trays |
| IBM25PPC750FX-GB0132T | 制造商:IC'S/TRANSISTORS/DIO 功能描述: 制造商:IC'S/TRANSISTORS/DIODES 功能描述: |
| IBM25PPC750FX-GB0132V | 制造商:IBM 功能描述:MPU 750XX RISC 32BIT - Trays |
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