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| 型號： | TMPR4956F |
| 廠商： | Toshiba Corporation |
| 英文描述： | 64-bit RISC (Reduced Instruction Set Computer) microprocessor(64位精簡指令集系統(tǒng)計算機微處理器) |
| 中文描述： | 64位RISC（精簡指令集計算機）微處理器（64位精簡指令集系統(tǒng)計算機微處理器） |
| 文件頁數(shù)： | 21/60頁 |
| 文件大小： | 244K |
| 代理商： | TMPR4956F |
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TOSHIBA
TENTATIVE
TMPR4955/56
20-Oct.-1999
21
5.5.5 External requests
As illustrated in Figure 5-5, there are three types of external request: read, write, and null. This section
will explain read responses, which are special external request cases.
Figure 5-5 External Requests
Read requests are used to call 1-word data from processor internal resources. Write requests are used to
write 1-word data to the processor internal resources. Null requests are requests that do not require
processor operation.
As illustrated in Figure 5-6, the processor uses arbitration signals ExtRqst* and Release* to control the
flow of external requests. The external agent cannot issue external requests unless access privileges to the
system interface are obtained. In order to do so, the external agent asserts the ExtRqst* signal, then waits
until the processor asserts the Release* signal for 1 cycle.
Figure 5-6 External Requests
External request
Read
Write
Null
TX4956
External agent
2. Processor grants access
privileges by asserting the
Release* signal
4. Processor obtains bus
access privileges again.
TX4956
External agent
1. External system requests
bus access privileges by
asserting the ExtRqst*
signal.
3. External system issues
external request
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