AD9548SLASHPCBZ datasheet(49/112 Pages) AD

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AD9548

Rev. 0 | Page 49 of 112

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

COND ITION

CONDITION = 0E01, BITS[4:0]

ELSE

CONDITION = FncInit, BITS[7:3]

ENDIF

IF INSTRUCTION = B0,

THEN CLEAR ALL TAGS

FncInit, BITS[7:3]

0E01, 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 {0E01, BITS[4:0]

≠ 0}

Figure 50. EEPROM Conditional Processing

The condition is a 5-bit value with 32 possibilities. Condition = 0

is the null condition. When the null condition is in effect, the

EEPROM controller executes all instructions unconditionally.

The remaining 31 possibilities, condition = 1 through condition

= 31, modify the EEPROM controller’s handling of a download

sequence. The condition originates from one of two sources

(see Figure 50), as follows:

•

FncInit, Bits[7:3], which is the state of the M3 to M7

multifunction pins at power-up (see the Initial Pin

Programming section)

•

If Register 0E01, Bits[4:0] ≠ 0, then the condition is the value

stored in Register 0E01, Bits[4:0]; otherwise, the condition is

FncInit, Bits[7:3]. Note that a nonzero condition present in

The condition tag board is a table maintained by the EEPROM

controller. When the controller encounters a condition instruct-

tion, it decodes the B1 through CF instructions as condition = 1

through condition = 31, respectively, and tags that particular

condition in the condition tag board. However, the B0

condition instruction decodes as the null condition, for which

the controller clears the condition tag board, and subsequent

download instructions execute unconditionally (until the

controller encounters a new condition instruction).

During download, the EEPROM controller executes or skips

instructions depending on the value of condition and the

contents of the condition tag board. Note, however, that

condition instructions and the end instruction always execute

unconditionally during download. If condition = 0, then all

instructions during download execute unconditionally. If

condition ≠ 0 and there are any tagged conditions in the

condition tag board, then the controller executes instructions

only if the condition is tagged. If the condition is not tagged,

then 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 condition instructions.

Table 27 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 B0 or no conditional instructions have

been processed.

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AD9548/PCBZ 数据表(PDF) 49 Page - Analog Devices

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