- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄367800 > PC755BVZFU300LD MICROPROCESSOR|32-BIT|CMOS|BGA|360PIN|PLASTIC PDF資料下載
參數(shù)資料
| 型號： | PC755BVZFU300LD |
| 英文描述： | MICROPROCESSOR|32-BIT|CMOS|BGA|360PIN|PLASTIC |
| 中文描述： | 微處理器| 32位|的CMOS | BGA封裝| 360PIN |塑料 |
| 文件頁數(shù)： | 35/48頁 |
| 文件大?。?/td> | 276K |
| 代理商： | PC755BVZFU300LD |
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頁當前第35頁第36頁第37頁第38頁第39頁第40頁第41頁第42頁第43頁第44頁第45頁第46頁第47頁第48頁
PC755B/745B
35/48
Figure 22 provides the test access port timing diagram.
TCK
TDI, TMS
TDO
VM = Midpoint Voltage (OVDD/2)
TDO
VM
VM
tIXJH
tIVJH
tJLOV
tJLOH
tJLOZ
INPUT
DATA VALID
DATA
VALID
OUTPUT DATA VALID
Figure 22 : Test Access Port Timing Diagram
4.2.5.2. JTAG Configuration Signals
Boundary scan testing is enabled through the JTAG interface signals. The TRST signal is optional in the IEEE 1149.1 specification
but is provided on all PowerPC implementations. While it is possible to force the TAP controller to the reset state using only the TCK
and TMS signals, more reliable power-on reset performance will be obtained if the TRST signal is asserted during power-on reset.
Since the JTAG interface is also used for accessing the common on-chip processor (COP) function of PowerPC processors, simply
tying TRST to HRESET isn’t practical.
The common on-chip processor (COP) function of PowerPC processors allows a remote computer system (typically a PC with dedi-
cated hardware and debugging software) to access and control the internal operations of the processor. The COP interface connects
primarily through the JTAG port of the processor, with some additional status monitoring signals. The COP port requires the ability to
independently assert HRESET or TRST in order to fully control the processor. If the target system has independent reset sources,
such as voltage monitors, watchdog timers, power supply failures, or push-button switches, then the COP reset signals must be
merged into these signals with logic.
The arrangement shown in Figure 23 allows the COP to independently assert HRESET or TRST, while insuring that the target can
drive HRESET as well. The pull-down resistor on TRST ensures that the JTAG scan chain is initialized during power-on if a JTAG
interface cable is not attached; if it is, it is responsible for driving TRST when needed.
Figure 23 shows the suggested TRST connection.
HRESET
HRESET
TRST
From Target
Board
Sources
COP Header
2KW
QACK
QACK
2KW
PC755B
Figure 23 : Suggested TRST Connection
相關PDF資料 |
PDF描述 |
|---|---|
| PC755 | PowerPC 755/745 RISC Microprocessor |
| PC755M8 | PC755M8 [Updated 6/03. 35 Pages] 32-bit RISC PowerPC-based Multichip Module |
| PC755CMGHU300LE | PowerPC 755/745 RISC Microprocessor |
| PC755CMGHU350LE | PowerPC 755/745 RISC Microprocessor |
| PC755CMGHU366LE | PowerPC 755/745 RISC Microprocessor |
相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| PC755BVZFU350LD | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:MICROPROCESSOR|32-BIT|CMOS|BGA|360PIN|PLASTIC |
| PC755BVZFU400LD | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:MICROPROCESSOR|32-BIT|CMOS|BGA|360PIN|PLASTIC |
| PC755CMGHU300LE | 制造商:ATMEL 制造商全稱:ATMEL Corporation 功能描述:PowerPC 755/745 RISC Microprocessor |
| PC755CMGHU350LE | 制造商:ATMEL 制造商全稱:ATMEL Corporation 功能描述:PowerPC 755/745 RISC Microprocessor |
| PC755CMGHU366LE | 制造商:ATMEL 制造商全稱:ATMEL Corporation 功能描述:PowerPC 755/745 RISC Microprocessor |
發(fā)布緊急采購，3分鐘左右您將得到回復。