AD9545 datasheet(144/157 Pages) AD

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AD9545

Data Sheet

Rev. A | Page 144 of 157

to force another transaction. If the bus is still busy, the EEPROM

controller restarts the arbitration timer, and the process continues

until the EEPROM controller eventually completes the pending

transaction.

Multidevice Configuration Example

Consider two AD9545 devices (Device 1 and Device 2) that

share a single EEPROM, and assume both devices have a

common PLL0 configuration but differing PLL1 configurations.

A template for an EEPROM sequence that accomplishes this

configuration is shown in Table 64.

The sequence relies on conditional processing to differentiate

between Device 1 and Device 2. Therefore, the user must

program the condition ID of both devices prior to executing an

EEPROM download. Specifically, the user must program the

EEPROM load condition bit field of Device 1 with a condition

ID of 1 and Device 2 with a condition ID of 2.

Table 64. Template for a Multidevice EEPROM Sequence

Instructions

Comment

0x00 to 0x7F

A sequence of register transfer instructions

associated with the PLL0 configuration

common to both devices

0xB1

Apply Condition 1

0x00 to 0x7F

A sequence of register transfer instructions

associated with the PLL1 configuration

specific to Device 1

0xB0

Clear the condition map

0xB2

Apply Condition 2

0x00 to 0x7F

A sequence of register transfer instructions

associated with the PLL1 configuration

specific to Device 2

0xB0

Clear the condition map

0x80

Input/output update

0xFF

End of sequence

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