- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄98011 > MC68838FCC (MOTOROLA INC) 1 CHANNEL(S), 125M bps, FDDI CONTROLLER, CQFP120 PDF資料下載
參數(shù)資料
| 型號： | MC68838FCC |
| 廠商： | MOTOROLA INC |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 1 CHANNEL(S), 125M bps, FDDI CONTROLLER, CQFP120 |
| 封裝： | CERAMIC, QFP-120 |
| 文件頁數(shù)： | 59/100頁 |
| 文件大?。?/td> | 465K |
| 代理商： | MC68838FCC |
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頁第58頁當前第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
5-2
MC68838 USER’S MANUAL
MOTOROLA
clock edge, the MAC begins to drive the NPDx bus. The MAC waits at least 40 ns to
allow the chip previously driving the bus time to three-state the bus.
After the next rising edge of the NPCLK (the second rising edge after the assertion of
MACSEL), the data on the NPDx bus is valid. It remains valid until after the second rising
edge of NPCLK after the negation of
MACSEL. The MAC three-states the NPDx bus
within 40 ns after this clock edge.
The timing described allows a read cycle to occur every 160 ns. However, if the NP
needs to extend the cycle and have the NPDx bus valid longer than one clock cycle, it
can delay the negation of
MACSEL (see Figure 5-1). For a minimum-length read cycle,
the NP must negate
MACSEL a setup time before the second rising edge of NPCLK
following the assertion of
MACSEL. If MACSEL remains asserted for a hold time after the
second rising edge of NPCLK, the MAC continues to drive the NPDx bus with valid data
until after the fourth rising edge of NPCLK. The NP can extend the read cycle indefinitely
by maintaining the assertion of
MACSEL.
CS
NPRW
NPA
NPD
BYTCLK (NPCLK)
Figure 5-1. Node Processor Bus Read Cycles
ARCHIVE
INFORMA
TION
ARCHIVE
INFORMA
TION
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| MC68EC020FG | 32-BIT, 25 MHz, MICROCONTROLLER, PQFP100 |
| MC68HC05CC1P | 8-BIT, MROM, 4.2 MHz, MICROCONTROLLER, PDIP40 |
| MC68HC05CC2B | 8-BIT, MROM, 4.2 MHz, MICROCONTROLLER, PDIP42 |
| MC68HC05CT4FN | 8-BIT, MROM, 2.048 MHz, MICROCONTROLLER, PQCC44 |
| MC68HC05J1P | 8-BIT, MROM, 2.1 MHz, MICROCONTROLLER, PDIP20 |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MC68840FE25B | 制造商:Motorola Inc 功能描述:68840FE25B |
| MC68840FE-25B | 制造商:Motorola Inc 功能描述:68840FE-25B |
| MC6885 | 制造商:MOTOROLA 制造商全稱:Motorola, Inc 功能描述:HEX THREE-STATE BUFFER/INVERTERS |
| MC68851 | 制造商:MOTOROLA 制造商全稱:Motorola, Inc 功能描述:32-Bit Paged Memory Management Unit |
| MC6885L | 制造商:MOTOROLA 制造商全稱:Motorola, Inc 功能描述:HEX THREE-STATE BUFFER/INVERTERS |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。