- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄370013 > PowerPC 750CX (IBM Microeletronics) 32-Bit Reduced Instruction Set Computer (RISC) Microprocessors(32位精簡指令集微處理器) PDF資料下載
參數(shù)資料
| 型號： | PowerPC 750CX |
| 廠商： | IBM Microeletronics |
| 英文描述： | 32-Bit Reduced Instruction Set Computer (RISC) Microprocessors(32位精簡指令集微處理器) |
| 中文描述： | 32位精簡指令集計算機(jī)（RISC）微處理器（32位精簡指令集微處理器） |
| 文件頁數(shù)： | 38/44頁 |
| 文件大?。?/td> | 562K |
| 代理商： | POWERPC 750CX |
第1頁第2頁第3頁第4頁第5頁第6頁第7頁第8頁第9頁第10頁第11頁第12頁第13頁第14頁第15頁第16頁第17頁第18頁第19頁第20頁第21頁第22頁第23頁第24頁第25頁第26頁第27頁第28頁第29頁第30頁第31頁第32頁第33頁第34頁第35頁第36頁第37頁當(dāng)前第38頁第39頁第40頁第41頁第42頁第43頁第44頁
PowerPC 750CX RISC Microprocessor Datasheet
Page 38
Version 1.1
November 13, 2000
7.9
Operational and Design Considerations
7.9.1 Level Protection
A level protection feature is included in the PowerPC 750CX RISC Microprocessor in releases DD2.0 and later. The
level protection feature is available only in the 1.8V bus mode. This feature prevents ambiguous floating reference volt-
ages by pulling the respective signal line to the last valid or nearest valid state.
For example, if the I/O voltage level is closer to OV
DD
, the circuit pulls the I/O level to OV
DD
; 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-stabil-
ity. In Table 16, these signals are defined as “keeper” in the "Level Protect" column.
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
μ
A.
This feature allows the system designer to limit the number of resistors in the design and optimize placement and reduce
costs.
7.9.2 64 or 32-Bit Data Bus Mode
Typical operation is considered to be in 64-bit Data Bus mode. Mode setting is determined by the state of the mode sig-
nal (QACK) at the transition of HRESET from its active to inactive state (low to high). If QACK is
low
when HRESET
transitions from active to inactive, 64-bit mode is selected. If QACK is
high
when HRESET transitions from active to
inactive, 32-bit mode is selected.
7.9.3 1.8V and 2.5V I/O Signal Support
Selection between 1.8V and 2.5V I/O is accomplished using the BVSEL pin. If BVSEL is set low then the 1.8V mode is
enabled. If BVSEL is set high, then the 2.5V mode is enabled.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| PowerPC 750 | 32-Bit Embedded Microprocessor(32位精簡指令集嵌入式微處理器) |
| PP-MOD1V2 | ISP INTERFACE MODULE |
| PP01002 | GEHOERSCHUTZ OHRSTOEPSEL 250ST Inhalt pro Packung: 250 Stk. |
| PP0901SA | Direct ProTek Replacement:PP0901SA |
| PP0901SB | Direct ProTek Replacement:PP0901SB |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| POWERPLUG15W | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:AC/DC POWER SUPPLY |
| POWERPLUG24W | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:AC/DC POWER SUPPLY |
| POWERPLUS 2C 2500MAH | 制造商:Energizer Battery Company 功能描述: |
| POWERPLUS 2D 2500MAH | 制造商:Energizer Battery Company 功能描述: |
| POWERPLUS 4AAA 850MAH | 制造商:Energizer Battery Company 功能描述: |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。