AD9929BBCZ datasheet(27/64 Pages) AD

27 / 64 page

AD9929

Rev. A | Page 27 of 64

EXTERNAL SYNCHRONIZATION (MASTER MODE)

External synchronization can be applied to synchronize the VD

and HD signals by applying an external pulse on the

SYNC/GATE (Pin 45) pin for master mode operation. The

SYNC/GATE pin is configured as an external SYNC input for

master mode operation by setting the SLAVE_MODE register

(Address 0xD6) = 0 (the AD9929 defaults to slave mode at

power-up).

SYNCCNT (Address 0x0A) and SYNCPOL (Address 0x01) are

the only two registers used for configuring the AD9929 for

external synchronization. The SYNCPOL is a 1-bit register used

for configuring the SYNC input as either active low or active

high. The AD9929 defaults to active low at power-up. The

function of the SYNCCNT register is described in Table 17.

Figure 20 and Figure 21 provide two examples of external

synchronization with SYNCPOL = 0.

Table 17. External Synchronization (Master Mode)

SYNCCNT

External Synchronization Options

Disable External Synchronization

VD Sync at every SYNC Pulse

VD Sync after 2nd Applied SYNC Pulse

VD Sync after 3rd Applied SYNC Pulse

VD Sync after 4th Applied SYNC Pulse

VD Sync after 5th Applied SYNC Pulse

VD Sync after 6th Applied SYNC Pulse

VD Sync after 7th Applied SYNC Pulse

VD Sync after 8th Applied SYNC Pulse

VD Sync after 9th Applied SYNC Pulse

VD Sync after 10th Applied SYNC Pulse

VD Sync after 11th Applied SYNC Pulse

VD Sync after 12th Applied SYNC Pulse

VD Sync after 13th Applied SYNC Pulse

VD Sync after 14th Applied SYNC Pulse

VD Sync after 1st Applied SYNC Pulse Only

SYNC

4 CLI

2 CLIMIN

4 CLI

MODE A

MODE B

SERIAL

WRITES

CHANGE TO MODE B

OPERATION

MODE

Figure 20. Example of Synchronization with SYNCPOL = 0 and SYNCCNT = 1

SYNC

4 CLI

2 CLIMIN

4 CLI

Figure 21. Example of Synchronization with SYNCPOL = 0 and CYNCCNT = 3

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