- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄368020 > PI7C21P100NH (Pericom Semiconductor Corp.) 2-PORT PCI-X BRIDGE PDF資料下載
參數(shù)資料
| 型號(hào)： | PI7C21P100NH |
| 廠商： | Pericom Semiconductor Corp. |
| 英文描述： | 2-PORT PCI-X BRIDGE |
| 中文描述： | 2端口PCI - X橋接 |
| 文件頁數(shù)： | 35/77頁 |
| 文件大?。?/td> | 603K |
| 代理商： | PI7C21P100NH |
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(dāng)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頁第49頁第50頁第51頁第52頁第53頁第54頁第55頁第56頁第57頁第58頁第59頁第60頁第61頁第62頁第63頁第64頁第65頁第66頁第67頁第68頁第69頁第70頁第71頁第72頁第73頁第74頁第75頁第76頁第77頁
PI7C21P100
2-PORT PCI-X BRIDGE
ADVANCE INFORMATION
Page 35 of 77
June 10, 2005 Revision 1.06
6.3.2
SECONDARY BUS
The secondary interface is capable of operating in either conventional PCI mode or in PCI-X
mode. PI7C21P100 controls the mode and frequency for the secondary bus by utilizing a pull-
up circuit connected to S_PCIXCAP. There are two pull-up resistors in the circuit as
recommended by the PCI-X addendum. The first resistor is a weak pull-up (56K ohms)
whose value is selected to set the voltage of S_PCIXCAP below its low threshold when a
PCI-X 66 device is attached to the secondary bus. The second resistor is a strong pull-up,
externally wired between S_PCIXCAP and S_PCIXCAP_PU. The value of the resistor (1K
ohm) is selected to set the voltage of S_PCIXCAP above its high threshold when all devices
on the secondary are PCI-X 66 capable. To detect the mode and frequency of the secondary
bus, S_PCIXCAP_PU is initially disabled and PI7C21P100 samples the value on
S_PCIXCAP.
If PI7C21P100 sees a logic LOW on S_PCIXCAP, one or more devices on the secondary
have either pulled the signal to ground (PCI-X 66 capable) or tied it to ground (only capable
of conventional PCI mode). To differentiate between the two conditions, PI7C21P100 then
enables S_PCIXCAP_PU to put the strong pull-up into the circuit. If S_PCIXCAP remains at
a logic LOW, it must be tied to ground by one or more devices, and the bus is initialized to
conventional PCI mode. If S_PCIXCAP_PU can be pulled up, one or more devices are
capable of only PCI-X 66 operation so the bus is initialized to PCI-X 66 mode. If
PI7C21P100 sees a logic HIGH on S_PCIXCAP, then all devices on the secondary bus are
capable of PCI-X 133 operation. PI7C21P100 then samples S_SEL100 to distinguish between
the 66-100 MHz and the 100-133 MHz clock frequency ranges. If PI7C21P100 sees logic
HIGH on S_SEL100, the secondary bus is initialized to PCI-X 100 mode. If the value is
LOW, PCI-X 133 is initialized. These two ranges allow adjustment of the clock frequency to
account for bus loading conditions.
There is no pin for M66EN for the secondary interface on PI7C21P100 because the internal
PLL is bypassed in conventional PCI mode. S_CLK is used directly, eliminating the need to
distinguish between conventional PCI 33 and conventional PCI 66.
Table 6-1 PROGRAMMABLE PULL-UP CIRCUIT
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| PI7C7100BNA | PCI Bus Interface/Controller |
| PI7C7100 | 3-Port PCI Bridge |
| PI7C7100CNA | 3-Port PCI Bridge |
| PI7C7300 | 3-PORT PCI-to-PCI BRIDGE |
| PI7C7300A | 3-PORT PCI-to-PCI BRIDGE |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| PI7C21P100NHE | 功能描述:外圍驅(qū)動(dòng)器與原件 - PCI 3 Port PCI Bridge RoHS:否 制造商:PLX Technology 工作電源電壓: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:FCBGA-1156 封裝:Tray |
| PI7C4025TRF4 | 制造商:Pericom Semiconductor Corporation 功能描述: |
| PI7C7100 | 制造商:PERICOM 制造商全稱:Pericom Semiconductor Corporation 功能描述:3-Port PCI Bridge |
| PI7C7100BNA | 制造商:Pericom Semiconductor Corporation 功能描述:3 PORT PCI TO PCI |
| PI7C7100CNA | 制造商:PERICOM 制造商全稱:Pericom Semiconductor Corporation 功能描述:3-Port PCI Bridge |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。