AD9914SLASHPCBZ datasheet(28/45 Pages) AD

28 / 45 page

AD9914

Data Sheet

Rev. F | Page 28 of 45

PROGRAMMING AND FUNCTION PINS

The AD9914 is equipped with a 32-bit parallel port. The 32-bit

port is for programming the internal registers of the device in

either serial mode or parallel mode as well as allowing for direct

modulation control of frequency (FTW), phase (POW), and

amplitude (AMP).

The state of the external function pins (F0 to F3) determines

how the 32-bit parallel port is configured. Pin 28 to Pin 31 are

the function pins. Refer to Table 10 for possible configurations.

Note that the OSK enable bit, CFR1[8], must be set to enable

amplitude control, as shown in Table 10.

Table 10. Parallel Port Configurations

Function Pins,

F[3:0]1

Mode Description

32-Bit Parallel Port Pin Assignment

Bits[31:24]2

Bits[23:16]3

Bits[15:8]4

Bits[7:0]5

0000

Parallel programming mode

Data[15:8]

(optional)

Data[7:0]

Address[7:0]

Controls writes, reads, and 8-bit

or 16-bit data-word. See the

Parallel Programming section for

details.

0001

Serial programming mode

Not used

Controls SCLK, SDIO, SDO, CS,

and SYNCIO. See the Serial

Programming section for details.

0010

Full 32 bits of direct frequency

tuning word control. MSB and LSB

aligned to parallel port pins

FTW[31:24]

FTW[23:16]

FTW[15:8]

FTW[7:0]

0011

Full 32 bits of direct frequency

tuning word control with different

parallel port pin assignments

FTW[15:8]

FTW[7:0]

FTW[31:24]

FTW[23:16]

0100

Full 16 bits of direct phase offset

control and full 12 bits of direct

amplitude control

POW[15:8]

POW[7:0]

AMP[11:8]

AMP[7:0]

0101

Full 12 bits of direct amplitude

control and full 16 bits of direct

phase offset control

AMP[11:8]

AMP[7:0]

POW[15:8]

POW[7:0]

0110

24 bits of partial FTW control and

8 bits of partial amplitude control

FTW[31:24]

FTW[23:16]

FTW[15:8]

AMP[15:8]

0111

24 bits of partial FTW control and

8 bits of partial phase offset control

FTW[31:24]

FTW[23:16]

FTW[15:8]

POW[15:8]

1000

24 bits of partial FTW control and

8 bits of partial amplitude control

FTW[31:24]

FTW[23:16]

FTW[15:8]

AMP[7:0]

1001

24 bits of partial FTW control and

8 bits of partial phase offset control

FTW[31:24]

FTW[23:16]

FTW[15:8]

POW[7:0]

1010

24 bits of partial FTW control and

8 bits of partial amplitude control

FTW[23:16]

FTW[15:8]

FTW[7:0]

AMP[15:8]

1011

24 bits of partial FTW control and

8 bits of partial phase offset control

FTW[23:16]

FTW[15:8]

FTW[7:0]

POW[15:8]

1100

24 bits of partial FTW control and

8 bits of partial amplitude control

FTW[23:16]

FTW[15:8]

FTW[7:0]

AMP[7:0]

1101

24 bits of partial FTW control and

8 bits of partial phase offset control

FTW[23:16]

FTW[15:8]

FTW[7:0]

POW[7:0]

1110

Not used

1111

Not used

1 Pin 31 to Pin 28.

2 Pin 68 to Pin 72, Pin 75 to 77.

3 Pin 78 to Pin 81, Pin 87, Pin 88, Pin 1, Pin 2.

4 Pin 3 to Pin 5, Pin 8 to Pin 12.

5 Pin 13 to Pin 15, Pin 18 to Pin 22.

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