- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄384797 > OR4E6 (Lineage Power) Field-Programmable Gate Arrays(現(xiàn)場可編程門陣列) PDF資料下載
參數(shù)資料
| 型號： | OR4E6 |
| 廠商： | Lineage Power |
| 英文描述： | Field-Programmable Gate Arrays(現(xiàn)場可編程門陣列) |
| 中文描述： | 現(xiàn)場可編程門陣列（現(xiàn)場可編程門陣列） |
| 文件頁數(shù)： | 58/132頁 |
| 文件大?。?/td> | 2667K |
| 代理商： | OR4E6 |
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頁當(dāng)前第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頁第78頁第79頁第80頁第81頁第82頁第83頁第84頁第85頁第86頁第87頁第88頁第89頁第90頁第91頁第92頁第93頁第94頁第95頁第96頁第97頁第98頁第99頁第100頁第101頁第102頁第103頁第104頁第105頁第106頁第107頁第108頁第109頁第110頁第111頁第112頁第113頁第114頁第115頁第116頁第117頁第118頁第119頁第120頁第121頁第122頁第123頁第124頁第125頁第126頁第127頁第128頁第129頁第130頁第131頁第132頁
58
Lucent Technologies Inc.
Preliminary Data Sheet
August 2000
ORCA Series 4 FPGAs
FPGA States of Operation
(continued)
There are configuration options that control the relative
timing of three events: DONE going high, release of the
set/reset of internal FFs, and user I/Os becoming
active. Figure 35 shows the start-up timing for ORCA
FPGAs. The system designer determines the relative
timing of the I/Os becoming active, DONE going high,
and the release of the set/reset of internal FFs. In the
ORCA Series FPGA, the three events can occur in any
arbitrary sequence. This means that they can occur
before or after each other, or they can occur simulta-
neously.
There are four main start-up modes: CCLK_NOSYNC,
CCLK_SYNC, UCLK_NOSYNC, and UCLK_SYNC.
The only difference between the modes starting with
CCLK and those starting with UCLK is that for the
UCLK modes, a user clock must be supplied to the
start-up logic. The timing of start-up events is then
based upon this user clock, rather than CCLK. The dif-
ference between the SYNC and NOSYNC modes is
that for SYNC mode, the timing of two of the start-up
events, release of the set/reset of internal FFs, and the
I/Os becoming active is triggered by the rise of the
external DONE pin followed by a variable number of ris-
ing clock edges (either CCLK or UCLK). For the
NOSYNC mode, the timing of these two events is
based only on either CCLK or UCLK.
DONE is an open-drain bidirectional pin that may
include an optional (enabled by default) pull-up resistor
to accommodate wired ANDing. The open-drain DONE
signals from multiple FPGAs can be tied together
(ANDed) with a pull-up (internal or external) and used
as an active-high ready signal, an active-low PROM
enable, or a reset to other portions of the system.
When used in SYNC mode, these ANDed DONE pin-
scan be used to synchronize the other two start-up
events, since they can all be synchronized to the same
external signal. This signal will not rise until all FPGAs
release their DONE pins, allowing the signal to be
pulled high.
The default for ORCA is the CCLK_SYNC synchro-
nized start-up mode where DONE is released on the
first CCLK rising edge, C1 (see Figure 35). Since this is
a synchronized start-up mode, the open-drain DONE
signal can be held low externally to stop the occurrence
of the other two start-up events. Once the DONE pin
has been released and pulled up to a high level, the
other two start-up events can be programmed individu-
ally to either happen immediately or after up to four ris-
ing edges of CCLK (Di, Di + 1, Di + 2, Di + 3, Di + 4).
The default is for both events to happen immediately
after DONE is released and pulled high.
A commonly used design technique is to release
DONE one or more clock cycles before allowing the I/O
to become active. This allows other configuration
devices, such as PROMs, to be disconnected using the
DONE signal so that there is no bus contention when
the I/Os become active. In addition to controlling the
FPGA during start-up, other start-up techniques that
avoid contention include using isolation devices
between the FPGA and other circuits in the system,
reassigning I/O locations, and maintaining I/Os as
3-stated outputs until contentions are resolved.
Each of these start-up options can be selected during
bit stream generation in ORCA Foundry, using
Advanced Options. For more information, please see
the ORCA Foundry documentation.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| ORT4622 | Field-Programmable System Chip (FPSC) Four Channel x 622 Mbits/s Backplane Transceiver(現(xiàn)場可編程系統(tǒng)芯片（四通道x 622 M位/秒背板收發(fā)器）) |
| ORT8850 | Field-Programmable System Chip(現(xiàn)場可編程系統(tǒng)芯片) |
| OS8740230 | Si Optical Receiver, 40 - 870MHz, 225mA max. @ 24VDC |
| OSC-1A0 | Ultra Miniature TCXO |
| OSC-1A1 | Ultra Miniature TCXO |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| OR4E6-1BA352 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:FPGA |
| OR4E6-1BC432 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:FPGA |
| OR4E6-1BM680 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:FPGA |
| OR4E6-2BA352 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:FPGA |
| OR4E6-2BC432 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:FPGA |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。