WM8170 datasheet(29/41 Pages) WOLFSON

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WM8170

Product Preview Rev 1.0

WOLFSON MICROELECTRONICS LTD

PP Rev 1.0 March 2000

MANAGEMENT INTERFACE

The WM8170 includes an easy-to-use and comprehensive Management Interface that allows the

user to write to and read from on-board registers and thus control all the digitally programmable

features of the device. The Management Interface can be configured to operate in either Parallel or

Serial Mode by setting the Parallel Not Serial (PNS) pin high or low respectively. Serial Mode is

recommended for real time video applications because writing and reading from the device can be

carried out at any time. If Parallel Mode is used, writing and reading must be performed within areas

of inactive video to prevent valid ADC output data from being replaced with the Management

Interface data.

MANAGEMENT INTERFACE CONFIGURATION

The pins used to control the Management Interface are described in Table 12.

The timing for writing in Serial and Parallel Mode is shown in Figures 23 and 24 respectively.

Selected registers can also be read via the interface thus allowing stored values to be checked by the

user. The timing for reading in Serial and Parallel Mode is shown in Figures 25 and 26 respectively.

PIN NAME

SERIAL MODE FUNCTION

PARALLEL MODE FUNCTION

PNS

Set Low to indicate Serial

Mode

Set High to indicate Parallel Mode

SEN/STB

Serial interface ENable, active

High

Parallel interface STrobe, active Low

SDI/DNA

Serial Data Interface

Data Not Address input

SCK/RNW

Serial interface Clock

Read Not Write input

SDO

Serial Data Out

Not Used

D2-D9

Not Used

Parallel data I/O pins

Table 12 Management Interface Pins and Functions

SCK

SDI

SEN

ADDRESS

DATA WORD

Figure 23 Writing in Serial Mode

SEN

SDO

SCK

SDI

ADDRESS

DATA WORD

OUTPUT DATA WORD

Figure 24 Reading in Serial Mode

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