參數(shù)資料
型號(hào)： EP9315-IBZ
廠商： Cirrus Logic Inc
文件頁(yè)數(shù)： 82/106頁(yè)
文件大?。?/td> 0K
描述： IC ARM9 SOC ENH UNIV 352PBGA
標(biāo)準(zhǔn)包裝： 40
系列： EP9
核心處理器： ARM9
芯體尺寸： 16/32-位
速度： 200MHz
連通性： EBI/EMI，EIDE，以太網(wǎng)，I²C，IrDA，鍵盤(pán)/觸摸屏，PCMCIA，SPI，UART/USART，USB
外圍設(shè)備： AC'97，DMA，I²S，LCD，LED，MaverickKey，POR，PWM，WDT
輸入/輸出數(shù)： 16
程序存儲(chǔ)器類(lèi)型： ROMless
RAM 容量： 32K x 8
電壓 - 電源 (Vcc/Vdd)： 1.65 V ~ 3.6 V
數(shù)據(jù)轉(zhuǎn)換器： A/D 8x12b
振蕩器型： 外部
工作溫度： -40°C ~ 85°C
封裝/外殼： 352-BGA
包裝： 托盤(pán)
配用： 598-1144-ND - KIT DEVELOPMENT EP9315 ARM9
其它名稱： 598-1263
DS785UM1
3-7
Copyright 2007 Cirrus Logic
MaverickCrunch Co-Processor
EP93xx User’s Guide
3
condition code field of any subsequent ARM instruction to gate the execution of that
instruction based on the result of a Crunch compare operation.
Table 3-3 illustrates the legal relationships and, for each one, the values written to the FCC
bits and the NZCV flags. The FCC bits and the NZCV flags provide the same information, but
in different ways and in different places. Their values depend only on the relationship
between the operands, regardless of whether the operands are considered signed integer,
unsigned integer, or floating point. The unordered relationship can only apply to floating point
operands.
The NZCV flags are not computed exactly as with integer comparisons using the ARM CMP
instruction. Hence, when examining the result of Crunch comparisons, the condition codes
field of ARM instructions should be interpreted differently, as shown in Table 3-4. The same
six condition codes should be used whether the comparison operands were signed integers,
unsigned integers, or floating point. No other condition codes are meaningful.
Table 3-3. Comparison Relationships and Their Results
Relationship
FCC[1:0]
NCZV
00
0100
01
1000
10
1001
Unordered
11
0000
Table 3-4. ARM
Condition Codes and Crunch Compare Results
Condition Code
Relationship
ARM Meaning
Crunch Meaning
Opcode[31:28] Mnemonic
0000
EQ
Equal
0001
NE
Not Equal
1010
GE
Signed Greater Than or Equal Greater Than or Equal
1011
LT
Signed Less Than
Less Than
1100
GT
Signed Greater Than
Greater Than
1101
LE
Signed Less Than or Equal
Less Than or Equal
1110
AL
N/A
Always (unconditional)
1111
NV
N/A
Never
AB
=
AB
<
AB
>
AB
=
AB
≠
AB
≥
AB
<
AB
>
A
B
≤
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