AD9516-2SLASHPCBZ datasheet(60/84 Pages) AD

60 / 84 page

AD9516-2

Rev. 0 | Page 60 of 84

Table 52 through Table 61 provide a detailed description of each of the control register functions. The registers are listed by hexadecimal

address. Reference to a specific bit or range of bits within a register is indicated by angle brackets. For example, <3> refers to Bit 3, and

<5:2> refers to the range of bits from Bit 5 through Bit 2.

Table 52. Serial Port Configuration

Reg. Addr (Hex)

Bit(s)

Name

Description

<7>

SDO Active

Selects unidirectional or bidirectional data transfer mode.

<7> = 0; SDIO pin used for write and read; SDO set high impedance; bidirectional mode.

<7> = 1; SDO used for read; SDIO used for write; unidirectional mode.

<6>

LSB First

MSB or LSB data orientation.

<6> = 0; data-oriented MSB first; addressing decrements.

<6> = 1; data-oriented LSB first; addressing increments.

<5>

Soft Reset

<5> = 1 (not self-clearing). Soft reset; restores default values to internal registers.

Not self-clearing. Must be cleared to 0b to complete reset operation.

<4>

Long Instruction

Short/long instruction mode (this part uses long instruction mode only, so this bit

should always be =1).

<4> = 0; 8-bit instruction (short).

<4> = 1; 16-bit instruction (long).

<3:0>

Mirror <7:4>

Bits<3:0> should always mirror <7:4> so that it does not matter whether the part

is in MSB or LSB first mode (see Register 0x00 <6>). User should set bits as follows:

<0> = <7>.

<1> = <6>.

<2> = <5>.

<3> = <4>.

<0>

Read Back Active Registers

Select register bank used for a readback.

<0> = 0; read back buffer registers.

<0> = 1; read back active registers.

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