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AN-206 Datasheet(PDF) 2 Page - Exar Corporation |
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AN-206 Datasheet(HTML) 2 Page - Exar Corporation |
2 / 8 page APPLICATION NOTE 2 AN206 3.0 PROGRAM EEPROM The EEPROM must be organized into address/data pairs. The first word of the pair is the address. Table 1 be- low shows the format of the 16-bit address: TABLE 1: EEPROM ADDRESS BIT DEFINITIONS BIT(S) DEFINITION 15 Parity Bit - Odd parity over entire address/data pair If there is a parity error, it will be reported in bit-3 of the REGB register in the Device Configura- tion Registers (offset 0x08E). 14 Final Address If 1, this will be the last data to be read. If 0, there will be more data to be read after this. 13:8 Reserved - Bits must be ’0’ 7:0 Target Address -- See Table 2 Table 2 shows the Target Addresses available for programming into bits 7:0 of the 16-bit address word. All oth- er Target Addresses are reserved and must not be used. TABLE 2: TARGET ADDRESS FOR EEPROM VALUES TARGET ADDRESS DATA EXAR DEFAULT 0x00 Vendor ID 0x13A8 0x01 Device ID 0x0358 -- No slave 0x4358 -- XR17V354 slave present 0x8358 -- XR17V358 slave present 0x02 Class code [7:0] lower 8 bits are reserved 0x0200 0x03 Class code [23:8] 0x0700 0x04 Subsystem Vendor ID 0x0000 0x05 Subsystem ID 0x0000 The second word of the pair is the data. The default values are shown in Table 2. Figure 2 shows the format of one address/data pair: |
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