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D15

D14

D13

D12

D11

D10

Instruction Cycle

Data Transfer Cycle

td(Data)

SDENB

SCLK

SDIO

SDENB

SCLK

SDIO

SDO

D15

D14

D13

D12

D11

D10

SDO

Data n

Data n-1

DAC3151

DAC3161

DAC3171

SLAS959A – AUGUST 2013 – REVISED AUGUST 2013

www.ti.com

Figure 71. Serial Interface Read Timing Diagram

In the SIF interface there are four types of registers:

NORMAL:

The NORMAL register type allows data to be written and read from. All 16-bits of the data are

registered at the same time. There is no synchronizing with an internal clock thus all register

writes are asynchronous with respect to internal clocks. There are three subtypes of NORMAL:

AUTOSYNC:

A NORMAL register that causes a sync to be generated after the write is

finished. These are most commonly used in things like offsets and phaseadd

where there is a word or block setup that extends across multiple registers

and all of the registers need to be programmed before any take effect on the

circuit. For example, the phaseadd is two registers long. It wouldn’t serve the

user to have the first write 16 of the 32 bits cause a change in the frequency,

so the design allows all the registers to be written and then when that last

one for this block is finished, an autosync is generated for the mixer telling it

to grab all the new SIF values. This will occur on a mixer clock cycle so that

no meta-stability errors occur.

No RESET Value: These are NORMAL registers, but for one reason or another reset value can

not be guaranteed. This could be because the register has some read_only

bits or some internal logic partially controls the bit values. An example is the

SIF_CONFIG6 register. The bits come from the temperature sensor and the

fuses. Depending on which fuses are blown and what the die temp is the

reset value will be different.

FUSE controlled:

While this isn’t a type of register, you may see this description in the area

describing the default value for the register. What is means is that fuses will

change the default value and the value shown in the document is for when

no fuses are blown.

READ_ONLY:

Registers that are internal wires ANDed with the address bus then connected to the SIF

output data bus.

WRITE_TO_CLEAR: These registers are just like NORMAL registers with one exception. They can be written

and read, however, when the internal logic asynchronously sets a bit high in one of

these registers, that bit stays high until it is written to ‘0’. This way interrupts will be

captured and stay constant until cleared by the user.

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