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參數(shù)資料
| 型號： | P60ARM-GP1N |
| 廠商： | Zarlink Semiconductor Inc. |
| 英文描述： | Low power, general purpose 32-bit RISC microprocessor |
| 中文描述： | 低功耗，通用32位RISC微處理器 |
| 文件頁數(shù)： | 76/120頁 |
| 文件大小： | 1275K |
| 代理商： | P60ARM-GP1N |
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P60ARM-B
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6.2 Data transfer cycles
Once the coprocessor has gone not-busy in a data transfer instruction, it must supply or accept data at the
ARM60 bus rate (defined by
MCLK
and
nWAIT
). It can deduce the direction of transfer by inspection of
the L bit in the instruction, but must only drive the bus when permitted to by
coprocessor is responsible for determining the number of words to be transferred; ARM60 will continue to
increment the address by one word per transfer until the coprocessor tells it to stop. The termination
condition is indicated by the coprocessor driving
CPA
DBE
being HIGH. The
and
CPB
HIGH.
There is no limit in principle to the number of words which one coprocessor data transfer can move, but by
convention no coprocessor should allow more than 16 words in one instruction. More than this would
worsen the worst case ARM60 interrupt latency, as the instruction is not interruptible once the transfers
have commenced. At 16 words, this instruction is comparable with a block transfer of 16 registers, and
therefore does not affect the worst case latency.
6.3 Register transfer cycle
The coprocessor register transfer cycle is the one case when ARM60 requires the data bus without requiring
the memory to be active. The memory system is informed that the bus is required by ARM60 taking both
nMREQ
and
SEQ
HIGH. When the bus is free,
DBE
coprocessor to drive the bus.
should be taken HIGH to allow ARM60 or the
6.4 Privileged instructions
The coprocessor may restrict certain instructions for use in privileged modes only. To do this, the
coprocessor will have to track the
nTRANS
output.
As an example of the use of this facility, consider the case of a floating point coprocessor (FPU) in a multi-
tasking system. The operating system could save all the floating point registers on every task switch, but
this is inefficient in a typical system where only one or two tasks will use floating point operations. Instead,
there could be a privileged instruction which turns the FPU on or off. When a task switch happens, the
operating system can turn the FPU off without saving its registers. If the new task attempts an FPU
operation, the FPU will appear to be absent, causing an undefined instruction trap. The operating system
will then realise that the new task requires the FPU, so it will re-enable it and save FPU registers. The task
can then use the FPU as normal. If, however, the new task never attempts an FPU operation (as will be the
case for most tasks), the state saving overhead will have been avoided.
6.5 Idempotency
A consequence of the implementation of the coprocessor interface, with the interruptible busy-wait state, is
that all instructions may be interrupted at any point up to the time when the coprocessor goes not-busy. If
so interrupted, the instruction will normally be restarted from the beginning after the interrupt has been
processed. It is therefore essential that any action taken by the coprocessor before it goes not-busy must be
idempotent, ie must be repeatable with identical results.
For example, consider a FIX operation in a floating point coprocessor which returns the integer result to an
ARM60 register. The coprocessor must stay busy while it performs the floating point to fixed point
conversion, as ARM60 will expect to receive the integer value on the cycle immediately following that
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PDF描述 |
|---|---|
| P60ARM-IG | Low power, general purpose 32-bit RISC microprocessor |
| P60ARM-B | Low power, general purpose 32-bit RISC microprocessor |
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| P60ARM-IG | 制造商:ZARLINK 制造商全稱:Zarlink Semiconductor Inc 功能描述:Low power, general purpose 32-bit RISC microprocessor |
| P-60AS/A18 | 功能描述:BATTERY NICAD 2/3A 600MAH W/TAB RoHS:否 類別:電池產(chǎn)品 >> 電池，充電式（蓄電池） 系列:- MSDS 材料安全數(shù)據(jù)表:Nickel Metal Hydride Battery MSDS 標準包裝:1,000 系列:TWICELL 電池化學:鎳金屬氫化物 電池大小:AAA 電壓 - 額定:1.2V 容量:930mAh 尺寸/尺寸:- 端接類型:焊片 放電速率:186mA 標準充電電流:100mA 標準充電時間:16小時 重量:0.029 磅（13.15g） 裝運信息:- 其它名稱:SY153T |
| P60AS302 | 制造商:APEM 功能描述: |
| P60AS632-8C | 制造商:NYLOK 功能描述: |
| P60AS701 | 功能描述:旋鈕開關 10POS BCD 0.15A 24V RoHS:否 制造商:C&K Components 位置數(shù)量:5 卡片組數(shù)量: 每卡片組極數(shù):2 電流額定值:250 mA 電壓額定值:125 V 指數(shù)角: 觸點類型: 觸點形式:DPST 端接類型:Solder 安裝類型:Panel 觸點電鍍:Silver |
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