FM25VN05-G datasheet(10/16 Pages) RAMTRON

Il numero della parte	FM25VN05-G

Spiegazioni elettronici	512Kb Serial 3V F-RAM Memory

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Produttore elettronici	RAMTRON [Ramtron International Corporation]

Homepage	http://www.ramtron.com

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10 / 16 page

FM25V05 - 512Kb SPI FRAM

Rev. 2.0

May 2010

Page 10 of 16

Unique Serial Number (FM25VN05 only)

The FM25VN05 device incorporates a read-only 8-

byte serial number. It can be used to uniquely

identify a pc board or system. The serial number

includes a 40-bit unique number, an 8-bit CRC, and a

16-bit number that can be defined upon request by

the customer. If a customer-specific number is not

requested, the 16-bit Customer Identifier is 0x0000.

The serial number is read by issuing the SNR op-

code (C3h).

The 8-bit CRC value can be used to compare to the

value calculated by the controller. If the two values

match, then the communication between slave and

master was performed without errors. The function

(shown below) is used to calculate the CRC value.

To perform the calculation, 7 bytes of data are filled

into a memory buffer in the same order as they are

read from the part – i.e. byte7, byte6, byte5, byte4,

byte3, byte2, byte1 of the serial number. The

calculation is performed on the 7 bytes, and the result

should match the final byte out from the part which is

byte0, the 8-bit CRC value.

CUSTOMER IDENTIFIER *

40-bit UNIQUE NUMBER

8-bit CRC

SN(63:56)

SN(55:48)

SN(47:40)

SN(39:32)

SN(31:24)

SN(23:16)

SN(15:8)

SN(7:0)

* Contact factory for requesting a customer identifier number.

Figure 14. 8-Byte Serial Number (read-only)

Function to Calculate CRC

BYTE calcCRC8( BYTE* pData, int nBytes )

{

static BYTE crctable[256] = {

0x00, 0x07, 0x0E, 0x09, 0x1C, 0x1B, 0x12, 0x15,

0x38, 0x3F, 0x36, 0x31, 0x24, 0x23, 0x2A, 0x2D,

0x70, 0x77, 0x7E, 0x79, 0x6C, 0x6B, 0x62, 0x65,

0x48, 0x4F, 0x46, 0x41, 0x54, 0x53, 0x5A, 0x5D,

0xE0, 0xE7, 0xEE, 0xE9, 0xFC, 0xFB, 0xF2, 0xF5,

0xD8, 0xDF, 0xD6, 0xD1, 0xC4, 0xC3, 0xCA, 0xCD,

0x90, 0x97, 0x9E, 0x99, 0x8C, 0x8B, 0x82, 0x85,

0xA8, 0xAF, 0xA6, 0xA1, 0xB4, 0xB3, 0xBA, 0xBD,

0xC7, 0xC0, 0xC9, 0xCE, 0xDB, 0xDC, 0xD5, 0xD2,

0xFF, 0xF8, 0xF1, 0xF6, 0xE3, 0xE4, 0xED, 0xEA,

0xB7, 0xB0, 0xB9, 0xBE, 0xAB, 0xAC, 0xA5, 0xA2,

0x8F, 0x88, 0x81, 0x86, 0x93, 0x94, 0x9D, 0x9A,

0x27, 0x20, 0x29, 0x2E, 0x3B, 0x3C, 0x35, 0x32,

0x1F, 0x18, 0x11, 0x16, 0x03, 0x04, 0x0D, 0x0A,

0x57, 0x50, 0x59, 0x5E, 0x4B, 0x4C, 0x45, 0x42,

0x6F, 0x68, 0x61, 0x66, 0x73, 0x74, 0x7D, 0x7A,

0x89, 0x8E, 0x87, 0x80, 0x95, 0x92, 0x9B, 0x9C,

0xB1, 0xB6, 0xBF, 0xB8, 0xAD, 0xAA, 0xA3, 0xA4,

0xF9, 0xFE, 0xF7, 0xF0, 0xE5, 0xE2, 0xEB, 0xEC,

0xC1, 0xC6, 0xCF, 0xC8, 0xDD, 0xDA, 0xD3, 0xD4,

0x69, 0x6E, 0x67, 0x60, 0x75, 0x72, 0x7B, 0x7C,

0x51, 0x56, 0x5F, 0x58, 0x4D, 0x4A, 0x43, 0x44,

0x19, 0x1E, 0x17, 0x10, 0x05, 0x02, 0x0B, 0x0C,

0x21, 0x26, 0x2F, 0x28, 0x3D, 0x3A, 0x33, 0x34,

0x4E, 0x49, 0x40, 0x47, 0x52, 0x55, 0x5C, 0x5B,

0x76, 0x71, 0x78, 0x7F, 0x6A, 0x6D, 0x64, 0x63,

0x3E, 0x39, 0x30, 0x37, 0x22, 0x25, 0x2C, 0x2B,

0x06, 0x01, 0x08, 0x0F, 0x1A, 0x1D, 0x14, 0x13,

0xAE, 0xA9, 0xA0, 0xA7, 0xB2, 0xB5, 0xBC, 0xBB,

0x96, 0x91, 0x98, 0x9F, 0x8A, 0x8D, 0x84, 0x83,

0xDE, 0xD9, 0xD0, 0xD7, 0xC2, 0xC5, 0xCC, 0xCB,

0xE6, 0xE1, 0xE8, 0xEF, 0xFA, 0xFD, 0xF4, 0xF3

};

BYTE crc = 0;

while( nBytes-- ) crc = crctable[crc ^ *pData++];

return crc;

}

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