AD9547BCPZ datasheet(49/106 Pages) AD

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Data Sheet

AD9547

Rev. G | Page 49 of 106

EXAMPLE

CONDITION 3 AND

CONDITION 13

ARE TAGGED

EEPROM

EEPROM CONTROLLER

UPLOAD

PROCEDURE

CONDITION

HANDLER

DOWNLOAD

PROCEDURE

CONDITION

TAG BOARD

IF B1 ≤ INSTRUCTION ≤ CF,

THEN TAG DECODED CONDITION

EXECUTE/SKIP

INSTRUCTION(S)

SCRATCH

PAD

CONDITION

CONDITION = 0x0E01, BITS[4:0]

ELSE

CONDITION = FncInit, BITS[7:3]

ENDIF

IF INSTRUCTION = B0,

THEN CLEAR ALL TAGS

FncInit, BITS[7:3]

0x0E01, BITS[4:0]

STORE CONDITION

INSTRUCTIONS AS

THEY ARE READ FROM

THE SCRATCH PAD.

WATCH FOR

OCCURRENCE OF

CONDITION

INSTRUCTIONS

DURING

DOWNLOAD.

IF {NO TAGS} OR {CONDITION = 0}

EXECUTE INSTRUCTIONS

ELSE

IF {CONDITION IS TAGGED}

EXECUTE INSTRUCTIONS

ELSE

SKIP INSTRUCTIONS

ENDIF

IF {0x0E01, BITS[4:0] ≠ 0}

Figure 50. EEPROM Conditional Processing

If the condition is not tagged, the controller skips instructions until

it encounters a condition instruction that decodes as a tagged

condition. Note that the condition tag board allows for multiple

conditions to be tagged at any given moment. This conditional

processing mechanism enables the user to have one download

instruction sequence with many possible outcomes, depending on

the value of the condition and the order in which the controller

encounters the condition instructions.

Table 29 lists a sample EEPROM download instruction sequence. It

illustrates the use of condition instructions and how they alter

the download sequence. The table begins with the assumption

that no conditions are in effect. That is, the most recently executed

condition instruction is 0xB0, or no conditional instructions

have been processed.

Table 29. EEPROM Conditional Processing Example

Instruction

Action

0x08

Transfer the system clock register contents

regardless of the current condition

0x01

0x00

0xB1

Tag Condition 1

0x19

Transfer the clock distribution register contents

only if condition = 1

0x04

0x00

0xB2

Tag Condition 2

0xB3

Tag Condition 3

0x07

Transfer the reference input register contents only

if condition = 1, 2, or 3

0x05

0x00

0x0A

Calibrate the system clock only if condition = 1, 2,

or 3

0xB0

Clear the condition tag board

Instruction

Action

0x80

Execute an I/O update, regardless of the value of

the condition

0x0A

Calibrate the system clock, regardless of the value

of the condition

Storing Multiple Device Setups in EEPROM

Conditional processing makes it possible to create a number of

different device setups, store them in EEPROM, and download

a specific setup on demand. To do so, first pro-gram the device

control registers for a specific setup. Then, store an upload

sequence in the EEPROM scratch pad with the following

general form:

Condition instruction (0xB1 to 0xCF) to identify the setup

with a specific condition (1 to 31)

Data instructions (to save the register contents) along with

any required calibrate and/or I/O update instructions

Pause instruction (0xFE)

With the upload sequence written to the scratch pad, perform

an EEPROM upload (Register 0x0E02, Bit 0).

Reprogram the device control registers for the next desired

setup. Then store a new upload sequence in the EEPROM scratch

pad with the following general form:

Condition Instruction 0xB0

The next desired condition instruction (0xB1 to 0xCF, but

different from the one used during the previous upload to

identify a new setup)

Data instructions (to save the register contents) along with

any required calibrate and/or I/O update instructions

Pause instruction (FE)

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