8

Integrated JPEG CODEC

3.0 VIDEO INTERFACE

The video interface of the ZR36060 is highly configurable, to

facilitate a glueless connection to most video decoders, encod-

ers, MPEG decoders, frame memory controllers, graphics

accelerators, etc.

3.1 Video Syncs - Master and Slave Modes

The ZR36060 supports two video sync source modes:

• Sync Master - the ZR36060 internally generates all the video

timing signals.

• Sync Slave - the ZR36060 synchronizes itself with an exter-

nal video source.

The 1-bit SyncMstr parameter selects the mode. Normally, in

compression the ZR36060 would be slaved to the output of a

video decoder, but not necessarily; for example, the ZR36060

could control a frame memory in Sync Master mode.

3.1.1 Master mode

When configured as a sync Master, the ZR36060 drives the fol-

lowing signals:

• HSYNC - Horizontal sync

• VSYNC - Vertical sync

• FI - Even/Odd field indication

• BLANK - Composite blanking

The parameters that configure the sync generator when the

ZR36060 is a sync master are (see Figure 3):

• Vtotal - Total number of lines per frame (e.g.- for NTSC, 525

video lines)

• Htotal - Total number of VCLKs (pixels) per line (e.g.- for

CCIR NTSC, 858 pixels)

• VsyncSize - Length of the VSYNC pulse measured in lines

• HsyncSize - Length of HSYNC pulse measured in VCLKs

• BVstart - Length (in lines) from VSYNC to first non-BLANK

line.

• BVend - Length (in lines) from VSYNC to last non-BLANK

line.

• BHStart - Length (in pixels) from HSYNC to first non-BLANK

pixel.

• BHend - Length (in pixels) from HSYNC to last non-BLANK

pixel.

• VSPol - Polarity of the VSYNC signal

• HSPol - Polarity of the HSYNC signal

• FIPol - Polarity of the FI signal

• BlPol - Polarity of the BLANK signal

DATERR

O

This output is asserted when there is a data corruption event. It is deasserted together with the deassertion (rising edge) of

END upon beginning of the next field process. On deassertion, DATERR is floating (needs external pull-up).

During and after RESET this pin is floating (logic high with pullup).

RTBSY

O

In compression this output signal indicates a “nearly full” condition in the internal raster-to-block memory (“strip” buffer). This

condition occurs when the strip buffer is 16 (or fewer) pixels away from an overflow condition.

In decompression RTBSY indicates that the strip buffer is nearly empty, i.e., during every 8*n line of video there are enough

blocks to display the next video line. Otherwise an underflow condition occurs.

In IDLE state RTBSY is not asserted.

If while RTBSY is asserted a data corruption event occurs (overflow or underflow), RTBSY continues to be asserted together

with DATERR until the beginning of the next field process (deassertion of END). If no data corruption occurs, RTBSY is deas-

serted as soon as the almost-overflow/underflow condition is no longer true.

RTBSY is meant to be connected to the RTBSY input of the ZR36057.

During and after RESET this pin is a logic high.

JIRQ

O

Interrupt request (active low). This output signal requests an interrupt from the host controller, if an interrupt request is enabled

and one of the events associated with interrupts occurs. It is deasserted if the host responds to the interrupt by reading the

interrupt status register, or if the host disables the interrupt, or upon a reset to the ZR36060.

On deassertion JIRQ is floating (needs external pull-up).

When JIRQ is active, the START signal is disregarded.

During and after RESET this pin is floating (logic high).

COMP

O

Compress/Decompress. This output signal provides an indication of the current operating mode of the ZR36060. When it is

high, the ZR36060 is in the compression mode; when it is low, the ZR36060 is in the decompression mode.

During and after RESET this pin is a logic high.

Power Signals

GND

Ground

Power supply (3.3V)

NC

Non-connect pins (reserved).

Table 1: Pin Descriptions (Continued)

Symbol

Type

Description