参数资料
| 型号： | EP9315-IB |
| 厂商： | Cirrus Logic Inc |
| 文件页数： | 3/16页 |
| 文件大小： | 0K |
| 描述： | IC ARM920T MCU 200MHZ 352-PBGA |
| 标准包装： | 40 |
| 系列： | EP9 |
| 核心处理器： | ARM9 |
| 芯体尺寸： | 16/32-位 |
| 速度： | 200MHz |
| 连通性： | EBI/EMI，EIDE，以太网，I²C，IrDA，键盘/触摸屏，PCMCIA，SPI，UART/USART，USB |
| 外围设备： | AC'97，DMA，I²S，LCD，LED，MaverickKey，POR，PWM，WDT |
| 输入/输出数： | 16 |
| 程序存储器类型： | ROMless |
| RAM 容量： | 32K x 8 |
| 电压 - 电源 (Vcc/Vdd)： | 1.65 V ~ 3.6 V |
| 数据转换器： | A/D 8x12b |
| 振荡器型： | 外部 |
| 工作温度： | -40°C ~ 85°C |
| 封装/外壳： | 352-BGA |
| 包装： | 托盘 |
| 配用： | 598-1144-ND - KIT DEVELOPMENT EP9315 ARM9 |
| 其它名称： | 598-1262 |
ER638E2B
11
Note: The effect of branches should also be accounted for, as it is the instruction stream as seen by the
coprocessor that matters, not the order of instructions in the source code. To avoid this error when entering
exception and interrupt handlers, the first seven instruction in an interrupt or exception handler should not
be a coprocessor instructions.
Description 5
When operating in serialized mode2, cfrshl32 and cfrshl64 do not work properly. The instructions shift by an
unpredictable amount, but cause no other side effects.
Workaround
One workaround is to avoid these instructions. With this approach, an alternative instruction sequence may
accomplish the shift with the following steps:
- Move the data to be shifted to ARM register(s)
- Shift the data using non-coprocessor instructions
- Move the shifted data back to the coprocessor.
Another workaround is to never operate in serialized mode. With this approach, synchronous exceptions are
not possible.
Description 6
If an interrupt occurs during the execution of cfldr32 or cfmv64lr, the instruction may not sign extend the
result correctly.
Either instruction places a 32 bit value into the lower half of one of the coprocessor general purpose registers
c0 through c15 and sign extends the high (32nd) bit through the upper half of the register. If an IRQ or FIQ
to the ARM processor interrupts either of these instructions at the right time, the coprocessor will properly
load the low 32 bits of the target register, but instead of sign extending it will replicate the low 32 bit into the
upper 32 bits. Code that depends on sign extension will fail to operate correctly.
Workaround
Possible workarounds include:
- Disable interrupts when executing cfldr32 or cfmv64lr instructions.
- Avoid executing these two instructions.
- Do not depend on the sign extension to occur; that is, ignore the upper word in any calculations
involving data loaded using these instructions.
- Add extra code to sign extend the lower word after it is loaded by explicitly forcing the upper word
to be all zeroes or all ones, as appropriate. It is possible to do this selectively in exception or interrupt
handler code. If the instruction preceding the interrupted instruction can be determined, and it is a
cfldr32 or cfmv64lr, the instruction may be re-executed or explicitly sign extended before returning
from interrupt or exception.
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相关代理商/技术参数 |
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| EP9315-IBZ | 功能描述:微处理器 - MPU IC Universal Platfrm ARM9 SOC Prcessor RoHS:否 制造商:Atmel 处理器系列:SAMA5D31 核心:ARM Cortex A5 数据总线宽度:32 bit 最大时钟频率:536 MHz 程序存储器大小:32 KB 数据 RAM 大小:128 KB 接口类型:CAN, Ethernet, LIN, SPI,TWI, UART, USB 工作电源电压:1.8 V to 3.3 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:FBGA-324 |
| EP9316 | 制造商:PCA 制造商全称:PCA ELECTRONICS INC. 功能描述:14 Pin DIP 5 Tap Low-Profile TTL Compatible Active Delay Lines |
| EP9317 | 制造商:PCA 制造商全称:PCA ELECTRONICS INC. 功能描述:14 Pin DIP 5 Tap Low-Profile TTL Compatible Active Delay Lines |
| EP9318 | 制造商:PCA 制造商全称:PCA ELECTRONICS INC. 功能描述:14 Pin DIP 5 Tap Low-Profile TTL Compatible Active Delay Lines |
| EP9319 | 制造商:PCA 制造商全称:PCA ELECTRONICS INC. 功能描述:14 Pin DIP 5 Tap Low-Profile TTL Compatible Active Delay Lines |
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