AD9915SLASHPCBZ datasheet(31/51 Pages) AD

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Data Sheet

AD9915

PROGRAMMING AND FUNCTION PINS

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The AD9915 is equipped with a 32-bit parallel port. The 32-bit port

is for programming the internal registers of the device in either seri-

al 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 11 for possible configurations.

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

amplitude control, as shown in Table 11.

Table 11. 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

(8-/16-Bit) 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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