參數(shù)資料
型號： LR4500
廠商： LSI Corporation
英文描述： Superscalar Microprocessor(超標量微處理器)
中文描述： 超標量微處理器（超標量微處理器）
文件頁數(shù)： 88/172頁
文件大?。?/td> 1142K
代理商： LR4500
5-18
Bus Interface Descriptions
transaction hits the D-cache in a write back cached read
while SCLoCKn is asserted, an incorrect condition exists,
and the CW4011 deasserts SCLoCKn without completing
any bus transactions.
SCTBSTn
Burst Transaction
The CW4011 asserts SCTBSTn and outputs it to the
DRAMC to indicate that a transaction is taking place
during which four doublewords will be moved, and that
the first doubleword is currently being moved. The
CW4011 deasserts the signal after the first word has
been transferred and during singleword transactions.
Output from Shell to DRAMC
SCTPWn
Next Transaction Is In-Page Write
Output from Shell to DRAMC
The CW4011 asserts this signal to indicate that the next
transaction is in the same DRAM page as the current
transaction, as defined in the Configuration Register.
When the CW4011 asserts SCTPWn, a maximum of four
write transactions take place one after the other, even if
there is an instruction fetch request or data read request.
If there are four continuous write transactions, the
CW4011 asserts SCTPWn from the first through the last
(fourth) transaction. The CW4011 asserts SCTPWn from
the beginning of one in-page write transaction to the end
of that transaction. The write buffer in the CW4011’s LSU
checks to see if the subsequent write request is in the
same page.
SCTSEn
Transaction Start Enable
SCTSEn enables or disables a new SCbus transaction.
Transaction requests are arbitrated only when SCTSEn is
asserted. During the time SCTSEn is deasserted, the
CW4011 core’s bus interface unit repeats the idle state.
If it is necessary to insert an idle cycle between two
transactions, the Lbus device may deassert SCTSEn
then assert it when SCBRDYn is asserted.
Input to Shell from SCLC
SCTSSn
Transaction Start Strobe
Output from Shell to
SCLC
The CW4011 asserts SCTSSn for one clock cycle at the
beginning of a transaction to indicate that a transaction
has started. If the next transaction begins immediately,
the CW4011 asserts SCTSSn continuously.
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LR4-550 功能描述:可復位保險絲 5.5A 20V 100A Imax RoHS:否 制造商:Bourns 電流額定值: 電阻:7.5 Ohms 最大直流電壓: 保持電流:0.1 A 安裝風格:SMD/SMT 端接類型:SMD/SMT 跳閘電流:0.6 A 引線間隔: 系列:MF-PSHT 工作溫度范圍:- 40 C to + 125 C
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