AD9558 datasheet(48/104 Pages) AD

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AD9558

Data Sheet

Rev. A | Page 48 of 104

Programming the EEPROM to Configure an M Pin to

Control Synchronization of Clock Distribution

A special EEPROM loading sequence is required to use the

EEPROM to load the registers and to use an M pin to

enable/disable outputs.

To control the output sync function by using an M pin, perform

the following steps:

Enable the M pins by writing Register 0x0200 = 0x01.

Issue an I/O update (Register 0x0005 = 0x01).

Set the appropriate M pin function (see the Clock

Distribution Synchronization section for details).

If this sequence is not performed, a SYNC pulse is issued

automatically.

The following changes write Register 0x0200 first and then issue

an I/O update before writing the remaining M pin configuration

registers in Register 0x0201 to Register 0x0208.

The default EEPROM loading sequence from Register 0x0E10 to

inserted into the EEPROM storage sequence:

R0x0E17 = 0x00 # Write one byte

R0x0E18 = 0x02 # at Register 0x0200

R0x0E19 = 0x00 #

R0x0E1A = 0x80 # Op code for I/O

Update R0x0E1B = 0x10 # Transfer 17 instead of 18 bytes

R0x0E1C = 0x02 # Transfer starts at Register address

R0x0E1D = 0x01 # 0x0201 instead of 0x0200

The rest of the EEPROM loading sequence is the same as the

default EEPROM loading sequence, except that the register

address of the EEPROM storage sequence is shifted down four

bytes from the default. For example,

•

R0x0E1E = default value of Register 0x0E1A = 0x2E

•

R0x0E1F = default value of Register 0x0E1B = 0x03

•

R0x0E20 = default value of Register 0x0E1C = 0x00

•

…

•

R0x0E40 = default value of Register 0x0E1C = 0x3C = 0xFF

(end of data)

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