AD9547SLASHPCBZ datasheet(67/104 Pages) AD

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AD9547

Rev. 0 | Page 67 of 104

SERIAL PORT CONFIGURATION AND PART IDENTIFICATION (REGISTER 0x0000 TO REGISTER 0x0005)

Table 37. SPI Control/I2C Control

Address

Bit

Bit Name

Description

0x0000

Unidirectional

Select SPI port SDO pin operating mode.

0 (default) = 3-wire.

1 = 4-wire (SDO pin enabled).

LSB first/IncAddr

Bit order for SPI port.

0 (default) = most significant bit and byte first (multibyte transfers use incrementing address).

1 = least significant bit and byte first (multibyte transfers use decrementing address).

Soft reset

Device reset (invokes an EEPROM download if M[7:3] ≠ 0).

0 (default) = normal operation.

1 = reset.

Long instruction

16-bit mode (the only mode supported by the device). This bit is read only and reads back as

Logic 1.

[3:0]

Unused

Unused.

Table 38. Reserved Register

Address

Bit

Bit Name

Description

0x0001

[7:0]

Unused

Unused.

Table 39. Silicon Revision Level (Read Only)

Address

Bit

Bit Name

Description

0x0002

[7:0]

Silicon revision number

Default = 0x31 = 0b00110001.

Table 40. Device ID (Read Only)

Address

Bit

Bit Name

Description

0x0003

[7:0]

Device ID

Default = 0x48 = 0b01001000.

Table 41. Register Readback Control

Address

Bit

Bit Name

Description

0x0004

[7:1]

Unused

Unused.

Read buffered register

For buffered registers, serial port readback reads from actual (active) registers instead of from the

buffer.

0 (default) = reads values currently applied to the device’s internal logic.

1 = reads buffered values that take effect on the next assertion of the I/O update.

Table 42. Soft I/O Update

Address

Bit

Bit Name

Description

0x0005

[7:1]

Unused

Unused.

I/O update

Writing a 1 to this bit transfers the data in the serial I/O buffer registers to the device’s

internal control registers. This is an autoclearing bit.

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