ZR36016 Просмотр технического описания (PDF) - Zoran Corporation

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ZR36016

INTEGRATED COLOR SPACE / RASTER-TO-BLOCK CONVERTER

Zoran Corporation 

Integrated Color Space / Raster-To-Block Converter

Figure 18 shows the processing area in compression when

PAY = 0, with the number of processed lines in a single frame

unknown and determined by the falling edge of VIN.

HIN

Processing Area

EOS Output

Figure 18. Processing Area When PAY = 0

The ZR36016 counts the number of lines in the processing

range and enters this in the NOL (Number Of Lines) register. If

the number of lines is not a multiple of 8 or 16, depending upon

the format as shown in Table 15, then the number is corrected

to be a proper multiple and entered in the register. When

RSTR=1, the number of lines need not be a multiple of 8 or 16.

If a VIN rising edge is not encountered after 64K lines, process-

ing is terminated with NOL=64K.

GO/STOP Register and the START Signal

The GO/STOP register enables processing by the ZR36016 and

terminates it, but it is the START signal in concert with STOP/

GO that determines which VIN will be recognized and its asso-

ciated data compressed, and which VIN will be recognized and

trigger data output in expansion. The figures below show two

examples for single frame mode, where a single frame is pro-

cessed. Figure 19 is when START is held high and the control is

accomplished with the GO/STOP register. Figure 20 shows

control with the START signal after the register has been set.

The timing of FBSY is for compression, with the end of scan

signal EOS being output from the ZR36016 to the ZR36050. In

both cases, the GO/STOP register will be cleared after process-

ing a single frame and it must be re-enabled to begin processing

the next frame.

VIN

START

FBSY

EOS

GO SET

Figure 19. Processing Controlled by GO/STOP Register in

Single Frame Compression Mode (CNTI = 0)

VIN

START

Ignored

FBSY

EOS

GO SET

Figure 20. Processing Controlled by START Signal in Single

Frame Compression Mode

Figures 21 and 22 show compression operation in sequential

mode, with control by START and the GO/STOP register.

VIN

START

Ignored

Ignored

FBSY

EOS

GO SET

Figure 21. Sequential Mode Operation (CNTI = 1)

with START Control

VIN

START

Ignored

Ignored

Ignored

Ignored

FBSY

EOS

GO SET

GO/STOP CLEARED (START Ignored)

Figure 22. Sequential Mode Operation with

GO/STOP Control

GO/STOP, START And FBSY Timing

When compressing, processing will start at the rising edge of

VIN, if both the GO/STOP register is set and START is high

before the rising edge of VIN. The time A shown in Figure 23

below must be greater than 0 in compression. In expansion, the

time A must be sufficient to allow the first strip of the image (the

minimum number of PAY lines, either 8 or 16 as shown in

Table 19) to be read in from the ZR36050 and stored in the strip

buffer. If the VIN rising edge occurs before the strip has been

completely expanded by the ZR36050 and loaded in the strip

buffer, either after the first GO (or START) or after completion of

the previous image in sequential mode, the VIN will be ignored

and the image will be output after the next VIN rising edge. In

case of images that were compressed as interlaced fields, care

must be taken to avoid mis-registration of fields.

During compression FBSY goes high at the rising edge of VIN

and goes low after the active window has been processed.

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