M08045 datasheet(31/49 Pages) MA-COM

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Functional Description

M08035, M08045 Data Sheet V1

MACOM

™

080x5-DSH-001

4.6.4

MIC Mode Operation

In this mode, the reclocker is initialized with an EEPROM. To use this mode, the EEPROM must be programmed

with the register data required. The I2C address of the memory can be 50h, 51h, 52h or 53h; the reclocker loads its

This mode is enabled when the I2C mode is set and address 20h has been hardwired on the address pins. When

the reclocker locates the memory at one of the above addresses, it sets itself into I2C quasi-master mode. It will

then load its registers from the EEPROM. Addresses 00h to 19h should be used when only one reclocker is used.

Once the master has finished the task of downloading the registers, it will revert to slave mode at address 20h and

can be accessed for debugging purposes.

Note that when using MIC power mode supply, ramp time is important. The EEPROM should be powered from the

same supply as DVDDIO and the ramp up of the supply should be < 100 ms. If the ramp time is not met, the

reclocker I2C will time-out before the EEPROM is ready to receive serial data.

The target EEPROM is the AT24C01 or equivalent.

If there is more than one reclocker to be programmed, a checksum is used to confirm that the data is correct. This

works as follows:

The slave reclocker sums all registers from 00h to 1Ah, then truncates this to leave the 8 LSB bits. This is then

compared with the value 2Eh. If it is not equal, then the registers are not loaded and it returns to the default

value. It will then try up to 512 times before timing out. When the checksum is equal to 2Eh, the registers are

loaded with the EEPROM settings.

To make the checksum = 2Eh, register 1Ah must be programmed with the 8 LSBs from the following

calculation:

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