ZR36057 Просмотр технического описания (PDF) - Zoran Corporation

Номер в каталоге

Компоненты Описание

Список матч

ZR36057

ENHANCED PCI BUS MULTIMEDIA CONTROLLER

Zoran Corporation 

Enhanced PCI Bus Multimedia Controller

The ZR36057 Video Interface drives out the video synchroniza-

tion signals synchronized with the negative edge of VCLKx2

(every other edge). The VCLK input is used as a phase qualifier.

The timing of the rising and the falling edges of VSYNC with

respect to the HSYNC signal are:

• Odd fields - The edges of VSYNC occur in the middle of the

non-active portion of HSYNC.

• Even fields - The edges of VSYNC occur in the middle of the

active portion of HSYNC.

5.2.3 ZR36057 Connection To The ZR36016

Figure 3 shows the recommended connections between the

ZR36057 and the ZR36016.

From External

Video Source

ZR36016

PXCLK

SYSCLK

VIN

HIN

PXIN[23:0]

PXEN

CBSY

START

PXOE

PXOUT[23:0]

VOUT

HOUT

DATA[7:0]

ADD[1:0]

CS

RD

WR

RESET

To Video

Encoder

ZR36057

VCLK

VCLKx2

VSYNC

HSYNC

YUV[15:0]/RGB[23:0]

PXEN

RTBSY

START

GPOn

GDAT[7:0]

GADD

GCSn

GRD

GWR

GPIOn

Figure 3. Recommended ZR36057 to ZR36016 Connections

In Motion Video Compression, the YUV video and synchroniza-

tion signals are driven by the external video source (for example,

a SAA7110) to the inputs of the ZR36057 and ZR36016. The

ZR36057 disables the PXOUT bus of the ZR36016 by deassert-

ing PXOE, in order to prevent bus contention.

In Motion Video Decompression, the synchronization signals are

driven by the ZR36057 (in sync master mode) or by an external

sync generator, associated with the video source. The decom-

pressed digital video is transferred from the ZR36016 PXOUT

bus to the ZR36057 video interface. The video bus of the

external video source, and if necessary its sync signals, must be

‘tri-stated’ using software control.

In Still Image Compression, the video bus as well as the sync

signals are driven by the ZR36057. The ZR36057 deasserts the

PXOE input of the ZR36016. The video bus of the external video

source (such as the video decoder of Figure 1), and if necessary

its sync signals, must be tri-stated using software control.

In Still Image Decompression mode, the sync signals are driven

by the ZR36057. Decompressed video is transferred from the

ZR36016’s PXOUT bus to the ZR36057’s Video Interface. In this

mode of operation, the video bus and sync signals of an external

video source (such as the video decoder of Figure 1) must be tri-

stated.

Table 3 defines the ZR36016 and the ZR36057 parameters

which define the portion of the field to be processed (the active

portion) and the type of field to begin with.

Table 3: Parameters Defining The Active Portion Of A

Field

Parameter

NAX

PAX

NAY

PAY

Odd_Even

Meaning

The number of pixels to be skipped, counted from the

active edge of HSYNC.

The number of active pixels in a line.

The number of lines to be skipped counted from the

active edge of VSYNC.

The number of active lines in a field.

The type of the first field to be processed. ‘1’ means an

Odd field, ‘0’ means an Even field.

5.2.3.1 START Signal Control

The START Signal is used in order to start the Compression/

Decompression process at the correct time for the desired field

type.

5.2.3.2 PXEN Signal Control

The ZR36057 drives the PXEN input of the ZR36016. While

PXEN is deactivated, the ZR36016 does not sample the PXIN

bus, nor the HIN and VIN inputs. Also, it freezes the PXOUT bus,

and HOUT and VOUT.

In order to keep the ZR36057 and the ZR36016 synchronized,

deactivation of PXEN by the ZR36057 also ‘holds’ the horizontal

counting and processing inside the ZR36057.

In Motion Video Compression mode, PXEN is activated

continuously.

In Motion Video Decompression mode, PXEN is asserted by

then ZR36057 after latching the rising edge of RTBSY, indicat-

ing that the first strip is ready in the ZR36016 strip memory.

In Still Image Compression mode, the image is transferred to the

ZR36057 by the host software pixel by pixel. PXEN is activated

only when a pixel is ready to be sent out from the ZR36057

Video Interface to the ZR36016 video input.

In Still Image Decompression mode, the image is read from the

ZR36057 by the host software pixel by pixel. PXEN is activated

to get the next pixel from the ZR36016 only after the previous

pixel has been read by the host.

12

Share Link: