MD1730 datasheet(16/34 Pages) MICROCHIP

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MD1730

DS20005586B-page 16

 2016 Microchip Technology Inc.

SPI REGISTER ADDRESS AND CONTROL BITS

4.4

Serial Peripheral Interface (SPI)

The MD1730’s SPI is used to program the phase delay

and frequency divider registers. The SPI supports

writing at speed up to 200 MHz and the MSB is shifted

in first. SPI interface supports two operating modes:

daisy chain mode and broadcasting mode.

When SPIB = 0, the MD1730 is in daisy chain mode. In

this mode, it supports both read and write operations.

When SPIB = 1 the chip enters the “Broadcasting”

mode. In this mode, the SDI data shifts into the shift

user can write the same register of different daisy

chained chips with the same value in a single write

transaction. However, when SPIB = 1 the read

operation is disabled. To verify the written data for each

chip, the user can revert SPIB = 0 and perform a

normal read operation.

4.4.1

SPI WRITE OPERATION EXAMPLES

The following is a 1-byte writing example for the

ADD = 0011b

with

the

data

D<7:0> = 01010101 when SPIB = TXRW = 0.

The Write operation starts with setting CSN to

low.

The SCK clock is used to shift in the following

SDI data:

W/R

SPI Register ADD<3:0>

Write or Read Data <7:0>

D12

D11

D10

= Write

= Read

MSB first.

(See

Section 4.3

and

Section 4.4

)

Channel 0 phase delay PHD0<7:0>

Channel 1 phase delay PHD1<7:0>

Channel 2 phase delay PHD2<7:0>

Channel 3 phase delay PHD3<7:0>

Channel 4 phase delay PHD4<7:0>

Channel 5 phase delay PHD5<7:0>

Channel 6 phase delay PHD6<7:0>

Channel 7 phase delay PHD7<7:0>

HIZ7

HIZ6

HIZ5

HIZ4

HIZ3

HIZ2

HIZ1

HIZ0

CW frequency divisor number CWFD<7:0>

Note:

Power-On or EN = 0 sets all the registers to 0.

TABLE 4-1:

PHD<7:0> PHASE DELAY TIME REGISTER DESCRIPTION

PHD<7:0>

Delay Time to Start Transmitting

00000000

0/fCLK (Power-on default)

00000001

1/fCLK

00000010

2/fCLK

.........

........

11111110

254/fCLK

11111111

255/fCLK

TABLE 4-2:

CWFD<7:0> CW FREQUENCY DIVIDER REGISTER DESCRIPTION

CWFD[7:0]

Transmit CW Frequency fCW

00000000

fCLK/512 (Power-on default)

00000001

fCLK/2

00000010

fCLK/4

00000011

fCLK/6

.........

........

11111110

fCLK/508

11111111

fCLK/510

Note:

The selected CW frequency is same for all the CW0~7 outputs: fCW = fCLK/2*CWFD. The CW frequency

applies to all channels.

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