参数资料
型号: EP9307-IRZ
厂商: Cirrus Logic Inc
文件页数: 7/16页
文件大小: 0K
描述: IC ARM9 SOC ARM920T 272TFBGA
标准包装: 119
系列: EP9
核心处理器: ARM9
芯体尺寸: 16/32-位
速度: 200MHz
连通性: EBI/EMI,以太网,I²C,IrDA,键盘/触摸屏,SPI,UART/USART,USB
外围设备: AC'97,DMA,I²S,LCD,LED,MaverickKey,POR,PWM,WDT
输入/输出数: 14
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: 272-TFBGA
包装: 托盘
配用: 598-1133-ND - KIT DEVELOPMENT EP9307 ARM9
其它名称: 598-1256
ER667E2B
15
Description 12
When an operand to the Crunch add/subtract unit is denormalized, it is forced to zero before input to the
calculation. The sign is unaffected. This affects the following instructions:
- Copies:
cfcpys, cfcpyd
- Add/Sub:
cfadds, cfaddd, cfsubs, cfsubd
- Absolute value: cfabss, cfabsd
- Negation:
cfnegs, cfnegd
- Conversions:
cfcvtsd, cfcvtds
When the operand is negative zero, cfcpys and cfcpyd write positive zero to the destination register, while
the result should be negative zero.
When the operand is positive zero, cfnegs and cfnegd write positive zero to the destination register, while
the result should be negative zero.
Workaround
None.
Description 13
The operation cfcvtds, which converts a double floating point value to a single floating point value, never
produces a denormalized result, even if the value can be accurately represented as such. The result
underflows directly to zero. Sign is preserved properly, however.
Workaround
None.
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