參數(shù)資料
型號(hào)： ACT-700SC-150F17Q
英文描述： Microprocessor
中文描述： 微處理器
文件頁(yè)數(shù)： 11/24頁(yè)
文件大?。?/td> 227K
代理商： ACT-700SC-150F17Q
Aeroflex Circuit Technology
SCD7000 REV A 3/16/00 Plainview NY (516) 694-6700
11
Primary Write Buffer
Writes to secondary cache or external memory,
whether cache miss write-backs or stores to
uncached or write-through addresses, use the
integrated primary write buffer. The write buffer holds
up to four 64-bit address and data pairs. The entire
buffer is used for a data cache write-back and allows
the processor to proceed in parallel with memory
update. For uncached and write-through stores, the
write buffer significantly increases performance by
decoupling the SysAD bus transfers from the
instruction execution stream.
System Interface
The ACT 7000SC provides a high-performance
64-bit system interface which is compatible with the
RM5200 Family and R5000. Unlike the R4000 and
R5000 family processors which provide only an
integral multiplication factor between SysClock and
the pipeline clock, the ACT 7000SC also allows
half-integral multipliers, thereby providing greater
granularity in the designers choice of pipeline and
system interface frequencies.
The interface consists of a 64-bit Address/Data bus
with 8 check bits and a 9-bit command bus. In
addition, there are six handshake signals and six
interrupt inputs. The interface has a simple timing
specification and is capable of transferring data
between the processor and memory at a peak rate of
600 MB/sec with a 75 MHz SysClock.
Figure 6 shows a typical embedded system using
the ACT 7000SC. This example shows a system with
a bank of DRAMs, and an interface ASIC which
provides DRAM control as well as an I/O port.
System Address/Data Bus
The 64-bit System Address Data (SysAD) bus is
used to transfer addresses and data between the
ACT 7000SC and the rest of the system. It is
protected with an 8-bit parity check bus, SysADC.
The system interface is configurable to allow easy
interfacing to memory and I/O systems of varying
frequencies. The data rate and the bus frequency at
which the ACT 7000SC transmits data to the system
interface are programmable via boot time mode
control bits. Also, the rate at which the processor
receives data is fully controlled by the external device.
Therefore, either a low cost interface requiring no
read or write buffering or a faster, high-performance
interface can be designed to communicate with the
ACT 7000SC. Again, the system designer has the
flexibility to make these price/performance trade-offs.
System Command Bus
The ACT 7000SC interface has a 9-bit System
Command (SysCmd) bus. The command bus
indicates whether the SysAD bus carries an address
or data. If the SysAD bus carries an address, then the
SysCmd bus also indicates what type of transaction is
to take place (for example, a read or write). If the
SysAD bus carries data, then the SysCmd bus also
gives information about the data (for example, this is
the last data word transmitted, or the data contains an
error). The SysCmd bus is bidirectional to support
both processor requests and external requests to the
ACT 7000SC. Processor requests are initiated by the
ACT 7000SC and responded to by an external
device. External requests are issued by an external
device and require the ACT 7000SC to respond.
The ACT 7000SC supports one to eight byte and
32-byte block transfers on the SysAD bus. In the case
of a sub-double-word transfer, the 3 low-order
address bits give the byte address of the transfer, and
the SysCmd bus indicates the number of bytes being
transferred.
Handshake Signals
There are six handshake signals on the system
interface. Two of these,
RdRdy*
and
WrRdy
*, are
used by an external device to indicate to the ACT
7000SC whether it can accept a new read or write
PCI Bus
X
X
Control
DRAM
Latch
72
72
72
25
SysAD Bus
SysCmd
Memory I/O
Controller
Flash/
Boot
ROM
Address
ACT 7000SC
8
Figure 6 – Typical Embedded System Block Diagram
Powered by ICminer.com Electronic-Library Service CopyRight 2003
相關(guān)PDF資料
PDF描述
ACT-700SC-150F17T Microprocessor
ACT-700SC-150F24C Microprocessor
ACT-700SC-150F24I Microprocessor
ACT-700SC-150F24M Microprocessor
ACT-700SC-150F24Q Microprocessor
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
ACT-700SC-150F17T 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Microprocessor
ACT-700SC-150F24C 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Microprocessor
ACT-700SC-150F24I 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Microprocessor
ACT-700SC-150F24M 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Microprocessor
ACT-700SC-150F24Q 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Microprocessor
發(fā)布緊急采購(gòu)，3分鐘左右您將得到回復(fù)。

采購(gòu)需求

(若只采購(gòu)一條型號(hào)，填寫一行即可)

發(fā)布成功！您可以繼續(xù)發(fā)布采購(gòu)。也可以進(jìn)入我的后臺(tái)，查看報(bào)價(jià)

發(fā)布成功！您可以繼續(xù)發(fā)布采購(gòu)。也可以進(jìn)入我的后臺(tái)，查看報(bào)價(jià)

*型號(hào) *數(shù)量 廠商 批號(hào) 封裝
添加更多采購(gòu)

我的聯(lián)系方式

*
*
*