WM8170 Datasheet, PDF (29/41 Pages) Wolfson Microelectronics plc – 3.3V Integrated Signal Processor for Area Array CCDs

WM8170
Product Preview Rev 1.0
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
PNS
SEN/STB
SDI/DNA
SCK/RNW
SDO
D2-D9
SERIAL MODE FUNCTION
Set Low to indicate Serial
Mode
Serial interface ENable, active
High
Serial Data Interface
Serial interface Clock
Serial Data Out
Not Used
PARALLEL MODE FUNCTION
Set High to indicate Parallel Mode
Parallel interface STrobe, active Low
Data Not Address input
Read Not Write input
Not Used
Parallel data I/O pins
Table 12 Management Interface Pins and Functions
SCK
SDI x a5 a4 a3 a2 a1 a0 b7 b6 b5 b4 b3 b2 b1 b0
SEN
ADDRESS
DATA WORD
Figure 23 Writing in Serial Mode
SCK
SDI X 1 ^{a4 a3 a2 a1 a0 X X X X X} X ^{X X X}
SEN
ADDRESS
DATA WORD
SDO
Figure 24 Reading in Serial Mode
d7 d6 d5 d4 d3 d2 d1 d0
OUTPUT DATA WORD
WOLFSON MICROELECTRONICS LTD
PP Rev 1.0 March 2000
29