AD9546SLASHPCBZ datasheet(182/205 Pages) AD

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AD9546

Data Sheet

Rev. 0 | Page 182 of 205

CONTROL FUNCTIONALITY

Configuring an Mx pin for control functionality gives the user

control of specific internal device functions via an external

hardware logic signal. When configured as a control pin, the

modifier bits affect the control functionality per Table 108.

Table 108. Mx Control Pin 2-Bit Modifier Codes

Code

Boolean

Description

AND

Logical AND the associated Mx control pin

with the other Mx control pins assigned to

the same control function.

NOT AND

Invert the logical state of the associated Mx

control pin and AND it with the other Mx

control pins assigned to the same control

function.

Logical OR the associated Mx control pin with

the other Mx control pins assigned to the

same control function.

NOT OR

Invert the logical state of the associated Mx

control pin and OR it with the other Mx control

pins assigned to the same control function.

The Boolean functionality of aggregated Mx control pins follows a

hierarchy whereby logical OR operations occur before logical AND

operations. The OR and NOT OR operations are collectively

grouped into a single result. A logical AND is then performed

using that result and the remaining AND and NOT AND

operations.

Consider a case where the M0, M2, M3, and CSB/M6 pins are

configured for control functionality and are assigned to the IO

update control function. That is, Bits[7:0] = 0x01 in

In addition, M0 is assigned for AND operation (00), M2 for NOT

OR (11) operation, M3 for NOT AND (01) operation, and M6 for

OR (10) operation (that is, the 2-bit codes according to Table 108

in the appropriate bit positions of Register 0x0100 and

With these settings, the IO update function behaves according to

the following Boolean expression:

((NOT M2) OR M6) AND M0 AND (NOT M3)

In this case, an IO update occurs when M0 is Logic 1 and M3 is

Logic 0, and either M2 is Logic 0 or M6 is Logic 1.

When an Mx control pin acts on a control function individually

(rather than as part of a group, per the previous example), the

Boolean functionality of the codes in Table 108 reduces to two

possibilities. Namely, Code 00 and Code 10 specify a Boolean

true (the Mx pin logic state applies to the corresponding

control function directly), whereas Code 01 and Code 11 specify a

Boolean false (the Mx pin logic state applies to the corresponding

control function with a logical inversion).

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