CDB4954A datasheet(4/20 Pages) CIRRUS

Il numero della parte	CDB4954A

Spiegazioni elettronici	Evaluation Board

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Produttore elettronici	CIRRUS [Cirrus Logic]

Homepage	http://www.cirrus.com

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CDB4954A/55A

4

1. CDB4954A/55A SYSTEM OVERVIEW

The CDB4954A/55A Evaluation Board allows the

CS4954/55 NTSC/PAL Digital Video Encoder ICs

from Cirrus Logic to be evaluated with a variety of

internal and external video signals. DIP switches on

the evaluation board allow external serial or parallel

video to drive the CS4954/55, display test patterns

contained in the evaluation board’s control FPGA,

and display NTSC images stored in FLASH. When

the CDB4954A/55A (Microsoft Windows95®,

Windows 98®, Windows NT®, and Windows

2000® compatible) software is used, bitmaps up to

720x480 pixels may be converted to CCIR656 PAL

or NTSC files, downloaded to SDRAM on the eval-

uation board and played from SDRAM through the

CS4954/55. In addition, NTSC CCIR656 files can

be stored to FLASH memory on the evaluation

board for later play back. The CDB4954A/55A

board supports Composite, RGB and S-Video out-

puts simultaneously.

The CDB4954A/55A has been partitioned into 6

schematics shown in Figure 5, Figure 6, Figure 7,

Figure 8, Figure 9, and Figure 10. Notice that the

partitioned schematics show the interconnections

between the pages.

2. SETUP ACTIVITIES

Setup of the CDB4954A/55A is straightforward.

DC Power is supplied to the board either via the

supplied “wall wart” style power supply or by us-

ing the binding posts on the board (but not both!)

When the board is powered, the Power In LED

(D6) will illuminate. If you're planning to use the

supplied software, you will need to copy the files

on the distribution disk shipped with the evaluation

board to your hard disk drive. You should use the

supplied 9-pin serial cable to connect your IBM®

PC (or compatible) to the 9-pin D-Sub connector

(labeled J6, RS-232) on the CDB4954A/55A.

2.1

DIP Switch Options

If you use the CDB4954A/55A Evaluation Board

without a PC (i.e. in the standalone mode), use the

followings to set up the board using the 8 position

dip switch. The dip switch positions are marked 1-

8. The individual switches select these functions:

Switches 1-4 select different operating modes. (Re-

fer to Table 3 on page 8 for more information.)

Switch 5 - Not Used

Switch 6 - PAL/NTSC data format.

Switch 7 - Pedestal Offset ON/OFF.

Switch 8 - Clipping Input Signals ON/OFF.

2.2

Control Port Software

The CDB4954A/55A is shipped with Microsoft®

Windows® based software for interfacing with the

CS4954/55 via the DB9 connector, J26. This soft-

ware allows the user to have complete access to the

control registers of the CS4954/55, as well as the

ability to access some features of the on-board FP-

GA. A comprehensive online Help is included.

2.2.1

Changing a CS4954/5 or FPGA Reg-

ister

There are two ways to change the values of either

CS4954/55 or FPGA registers. When a register

check box is checked, the corresponding register

bit is set to a “1”. When unchecked, the bit is set to

“0”. The first approach, shown on Figure 1 on page

5, is to check or uncheck particular bit values in the

desired register. For example, in Figure 1, the

CONTROL_0

configuration

register

of

the

CS4954/55 is set for CCIR656 mode (CCIR656

check box checked) and for video input from

V[7:0] (IN_MODE check box checked). In addi-

tion, the background color generated by the

CS4954/55 is set to blue (BLUE1 and BLUE0

check boxes are checked). The second approach is

to click the register label above any set of register

check boxes. This brings up a dialog which is

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