- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄379891 > CL-PS7500FE (CIRRUS LOGIC INC) System-on-a Chip for Internet Appliance PDF資料下載
參數(shù)資料
| 型號(hào)： | CL-PS7500FE |
| 廠商： | CIRRUS LOGIC INC |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | System-on-a Chip for Internet Appliance |
| 中文描述： | 32-BIT, RISC MICROCONTROLLER, PQFP240 |
| 封裝： | PLASTIC, QFP-240 |
| 文件頁(yè)數(shù)： | 36/251頁(yè) |
| 文件大?。?/td> | 2367K |
| 代理商： | CL-PS7500FE |
第1頁(yè)第2頁(yè)第3頁(yè)第4頁(yè)第5頁(yè)第6頁(yè)第7頁(yè)第8頁(yè)第9頁(yè)第10頁(yè)第11頁(yè)第12頁(yè)第13頁(yè)第14頁(yè)第15頁(yè)第16頁(yè)第17頁(yè)第18頁(yè)第19頁(yè)第20頁(yè)第21頁(yè)第22頁(yè)第23頁(yè)第24頁(yè)第25頁(yè)第26頁(yè)第27頁(yè)第28頁(yè)第29頁(yè)第30頁(yè)第31頁(yè)第32頁(yè)第33頁(yè)第34頁(yè)第35頁(yè)當(dāng)前第36頁(yè)第37頁(yè)第38頁(yè)第39頁(yè)第40頁(yè)第41頁(yè)第42頁(yè)第43頁(yè)第44頁(yè)第45頁(yè)第46頁(yè)第47頁(yè)第48頁(yè)第49頁(yè)第50頁(yè)第51頁(yè)第52頁(yè)第53頁(yè)第54頁(yè)第55頁(yè)第56頁(yè)第57頁(yè)第58頁(yè)第59頁(yè)第60頁(yè)第61頁(yè)第62頁(yè)第63頁(yè)第64頁(yè)第65頁(yè)第66頁(yè)第67頁(yè)第68頁(yè)第69頁(yè)第70頁(yè)第71頁(yè)第72頁(yè)第73頁(yè)第74頁(yè)第75頁(yè)第76頁(yè)第77頁(yè)第78頁(yè)第79頁(yè)第80頁(yè)第81頁(yè)第82頁(yè)第83頁(yè)第84頁(yè)第85頁(yè)第86頁(yè)第87頁(yè)第88頁(yè)第89頁(yè)第90頁(yè)第91頁(yè)第92頁(yè)第93頁(yè)第94頁(yè)第95頁(yè)第96頁(yè)第97頁(yè)第98頁(yè)第99頁(yè)第100頁(yè)第101頁(yè)第102頁(yè)第103頁(yè)第104頁(yè)第105頁(yè)第106頁(yè)第107頁(yè)第108頁(yè)第109頁(yè)第110頁(yè)第111頁(yè)第112頁(yè)第113頁(yè)第114頁(yè)第115頁(yè)第116頁(yè)第117頁(yè)第118頁(yè)第119頁(yè)第120頁(yè)第121頁(yè)第122頁(yè)第123頁(yè)第124頁(yè)第125頁(yè)第126頁(yè)第127頁(yè)第128頁(yè)第129頁(yè)第130頁(yè)第131頁(yè)第132頁(yè)第133頁(yè)第134頁(yè)第135頁(yè)第136頁(yè)第137頁(yè)第138頁(yè)第139頁(yè)第140頁(yè)第141頁(yè)第142頁(yè)第143頁(yè)第144頁(yè)第145頁(yè)第146頁(yè)第147頁(yè)第148頁(yè)第149頁(yè)第150頁(yè)第151頁(yè)第152頁(yè)第153頁(yè)第154頁(yè)第155頁(yè)第156頁(yè)第157頁(yè)第158頁(yè)第159頁(yè)第160頁(yè)第161頁(yè)第162頁(yè)第163頁(yè)第164頁(yè)第165頁(yè)第166頁(yè)第167頁(yè)第168頁(yè)第169頁(yè)第170頁(yè)第171頁(yè)第172頁(yè)第173頁(yè)第174頁(yè)第175頁(yè)第176頁(yè)第177頁(yè)第178頁(yè)第179頁(yè)第180頁(yè)第181頁(yè)第182頁(yè)第183頁(yè)第184頁(yè)第185頁(yè)第186頁(yè)第187頁(yè)第188頁(yè)第189頁(yè)第190頁(yè)第191頁(yè)第192頁(yè)第193頁(yè)第194頁(yè)第195頁(yè)第196頁(yè)第197頁(yè)第198頁(yè)第199頁(yè)第200頁(yè)第201頁(yè)第202頁(yè)第203頁(yè)第204頁(yè)第205頁(yè)第206頁(yè)第207頁(yè)第208頁(yè)第209頁(yè)第210頁(yè)第211頁(yè)第212頁(yè)第213頁(yè)第214頁(yè)第215頁(yè)第216頁(yè)第217頁(yè)第218頁(yè)第219頁(yè)第220頁(yè)第221頁(yè)第222頁(yè)第223頁(yè)第224頁(yè)第225頁(yè)第226頁(yè)第227頁(yè)第228頁(yè)第229頁(yè)第230頁(yè)第231頁(yè)第232頁(yè)第233頁(yè)第234頁(yè)第235頁(yè)第236頁(yè)第237頁(yè)第238頁(yè)第239頁(yè)第240頁(yè)第241頁(yè)第242頁(yè)第243頁(yè)第244頁(yè)第245頁(yè)第246頁(yè)第247頁(yè)第248頁(yè)第249頁(yè)第250頁(yè)第251頁(yè)
June 1997
35
ADVANCE DATA BOOK v2.0
IDC
CL-PS7500FE
System-on-a-Chip for Internet Appliance
5.
IDC
ARM processor contains a 4-Kbyte mixed-instruction and data cache. The IDC has 256 lines of 16 bytes
(4 words), organized as a four-way set associative cache, and uses the virtual addresses generated by
the processor core. The IDC is always reloaded one line at a time (four words). It can be enabled or dis-
abled through the ARM processor Control register and is disabled on nRESET.
The operation of the cache is further controlled by the cacheable or C bit stored in the Memory Manage-
ment Page table (see the
Section 6 on page 38
). For this reason, to use the IDC the MMU must be
enabled. However, the two functions can be enabled simultaneously with a single write to the Control reg-
ister.
5.1
Cacheable Bit
The C bit determines whether data being read can be placed in the IDC and used for subsequent read
operations. Typically, main memory is marked as cacheable to improve system performance, and I/O
space as non-cacheable to stop the data being stored in the cache of the CL-PS7500FE. (For example,
if the processor is polling a hardware flag in I/O space, it is important that the processor is forced to read
data from the external peripheral, and not a copy of initial data held in the cache.) The Cacheable bit can
be configured for both pages and sections.
5.2
IDC Operation
In the ARM processor the cache is searched regardless of the state of the C bit, only reads that miss the
cache are affected.
G
Cacheable reads
— C = 1: A line fetch of 4 words is performed and randomly placed in a cache bank.
G
Uncacheable reads
— C = 0: An external memory access is performed and the cache is not written.
5.2.1
IDC Validity
The IDC operates with virtual addresses, so ensure that the contents remain consistent with the virtual-
to-physical mappings performed by the MMU. If the memory mappings are changed, the IDC validity must
be ensured.
5.2.2
Software IDC Flush
The entire IDC can be marked as invalid by writing to the ARM processor IDC Flush register (register 7).
The cache is flushed immediately the register is written, but note that the next two instruction fetches may
come from the cache before the register is written.
5.2.3
Doubly-Mapped Space
Since the cache works with virtual addresses, it is assumed that every virtual address maps to a different
physical address. If the same physical location is accessed by more than one virtual address, the cache
cannot maintain consistency, since each virtual address has a separate entry in the cache, and only one
entry is updated on a processor write operation. To avoid any cache inconsistencies, both doubly-mapped
virtual addresses should be marked as uncacheable.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| CL-SH8665 | Integrated ATA Drive microcontroller(集成ATA驅(qū)動(dòng)微控制器) |
| CL1431 | Precision Adjustable Shunt Reference |
| CL1431D | Precision Adjustable Shunt Reference |
| CL1431LP | Precision Adjustable Shunt Reference |
| CL1431S | Precision Adjustable Shunt Reference |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| CLPT-12SP-06 | 制造商:Tri-Star Electronics International 功能描述:CONNECTOR - Bulk |
| CLPT-12SP-67 | 制造商:Tri-Star Electronics International 功能描述:- Bulk |
| CL-PU/O | 制造商:Maxell 功能描述:Couleur® Stereo Ear Buds w/ Multi-Size Ear Tips - Purple/Orange |
| CL-PX0070-30QC-A | 制造商:Cirrus Logic 功能描述:TRAY OF 19 3 OF THEM SLIGHTLY BENT LEADS |
| CL-PX0072-30QC-A | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Non-VGA Video Controller |
發(fā)布緊急采購(gòu)，3分鐘左右您將得到回復(fù)。