CDCE62005 datasheet(23/76 Pages) TI

23 / 76 page

INTERFACE AND CONTROL BLOCK

Interface

Control

REF_SELECT

/Power_Down

/SYNC

EEPROM(DefaultConfiguration)

Device

Hardware

SPI_LE

SPI_CLK

SPI_MISO

SPI_MOSI

Register0

StaticRAM(DeviceRegisters)

Register1

Register2

Register3

Register4

Register5

Register6

Register7

Register8

Register0

Register1

Register2

Register3

Register4

Register5

Register6

Register7

SPI (Serial Peripheral Interface)

CDCE62005

www.ti.com........................................................................................................................................................................................... SCAS862 – NOVEMBER 2008

The Interface & Control Block includes a SPI interface, four control pins, a non-volatile memory array in which

the device stores default configuration data, and an array of device registers implemented in Static RAM. This

RAM, also called the device registers, configures all hardware within the CDCE62005.

Figure 18. CDCE62005 Interface and Control Block

The serial interface of CDCE62005 is a simple bidirectional SPI interface for writing and reading to and from the

device registers. It implements a low speed serial communications link in a master/slave topology in which the

CDCE62005 is a slave. The SPI consists of four signals:

• SPI_CLK: Serial Clock (Output from Master) – the CDCE62005 clocks data in and out on the rising edge of

SPI_CLK. Data transitions therefore occur on the falling edge of the clock.

• SPI_MOSI: Master Output Slave Input (Output from Master) .

• SPI_MISO: Master Input Slave Output (Output from Slave)

• SPI_LE: Latch Enable (Output from Master). The falling edge of SPI_LE initiates a transfer. If SPI_LE is high,

no data transfer can take place.

The CDCE62005 implements data fields that are 28-bits wide. In addition, it contains 9 registers, each

comprising a 28 bit data field. Therefore, accessing the CDCE62005 requires that the host program append a

4-bit address field to the front of the data field as follows:

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