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M25P20-VMP3G/X 参数 Datasheet PDF下载

M25P20-VMP3G/X图片预览
型号: M25P20-VMP3G/X
PDF下载: 下载PDF文件 查看货源
内容描述: 2兆位,低电压,串行闪存与50MHz的SPI总线接口 [2 Mbit, low voltage, Serial Flash memory with 50MHz SPI bus interface]
分类和应用: 闪存
文件页数/大小: 50 页 / 964 K
品牌: NUMONYX [ NUMONYX B.V ]
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M25P20  
Instructions  
6.3  
Read Identification (RDID)  
The Read Identification (RDID) instruction is available in products with Process Technology  
code X only.  
The Read Identification (RDID) instruction allows the 8-bit manufacturer identification to be  
read, followed by two bytes of device identification. The manufacturer identification is  
assigned by JEDEC, and has the value 20h for Numonyx. The device identification is  
assigned by the device manufacturer, and indicates the memory type in the first byte (20h),  
and the memory capacity of the device in the second byte (12h).  
Any Read Identification (RDID) instruction while an Erase or Program cycle is in progress, is  
not decoded, and has no effect on the cycle that is in progress.  
The Read Identification (RDID) instruction should not be issued while the device is in Deep  
Power-down mode.  
The device is first selected by driving Chip Select (S) Low. Then, the 8-bit instruction code  
for the instruction is shifted in. This is followed by the 24-bit device identification, stored in  
the memory, being shifted out on Serial Data Output (Q), each bit being shifted out during  
the falling edge of Serial Clock (C).  
The instruction sequence is shown in Figure 9.  
The Read Identification (RDID) instruction is terminated by driving Chip Select (S) High at  
any time during data output.  
When Chip Select (S) is driven High, the device is put in the Stand-by Power mode. Once in  
the Stand-by Power mode, the device waits to be selected, so that it can receive, decode  
and execute instructions.  
Table 5.  
Read Identification (RDID) Data-Out Sequence  
Device Identification  
Manufacturer Identification  
Memory Type  
Memory Capacity  
20h  
20h  
12h  
Figure 9.  
Read Identification (RDID) Instruction Sequence and Data-Out Sequence  
S
0
1
2
3
4
5
6
7
8
9
10 11 12 13 14 15 16 17 18  
28 29 30 31  
C
D
Instruction  
Manufacturer Identification  
Device Identification  
High Impedance  
Q
15 14 13  
MSB  
3
2
1
0
MSB  
AI06809b  
19/50  
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