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ZR36016

INTEGRATED COLOR SPACE / RASTER-TO-BLOCK CONVERTER

Zoran Corporation 

Integrated Color Space / Raster-To-Block Converter

When the last pixel of the PAX portion of the last buffer line is

output on the PXOUT bus, a check is made to see if the next

buffer has been loaded from the ZR36050 (8 or 16 lines if

RSTR = 0 or one line if RSTR = 1). If it has not been loaded, then

CBSY is asserted.

DSYNC

BDATA

MWE

MOE

PXOUT

CBSY

STOP

63 64 1 2 3 4 5 6

36

Delay of internal processing

PAX

Check if all contents of pixel

side buffer have been entered

28 SYSCLK

61 62 63 64

1

Pixel side buffer is always monitored

Check if all contents of coder side

buffer have been read out

Buffer selection point

Delay of internal processing

Figure 27. Normal Expansion Operation When CBSY is Not Asserted

Figure 28 shows the condition when CBSY is asserted but the

line is not ignored. However, if CBSY is asserted at the time HIN

rises, the expansion process on the next line is ignored and the

image data coming from PXIN is output from PXOUT instead.

HIN

PXIN

NAX

PAX

Delay of internal processing

Check if all contents of coder side

buffer have been read out

MWE

Check if all contents of pixel

side buffer have been entered

MOE

DSYNC

CBSY

Pixel side buffer is always monitored

Delay of

internal

processing

Buffer

selection

point

Figure 28. Expansion Operation When CBSY is Asserted

but the Line is Not Ignored

Strip Buffer And Sub-Buffer

The external strip buffer memory is used for the raster-to-block

and block-to-raster conversions. Double buffering is used for the

8 or 16 lines per block or a single line for raster-to-raster conver-

sion. The memory is typically composed of two physical 8-bit-

wide memories organized as shown in Figure 29. A/B and A’/B’

are the two strip buffers. Reading and writing are always done

with 16-bit accesses. The switch between reading and writing

takes place at the SYSCLK rate. The sub-buffer allows continu-

ous pixel data flow while the ZR36050-side buffer is being

accessed.

ZR36016

PXIN/PXOUT

16

Sub-Buffer

16

16

ZR36050

A

8

A’ Unused SRAM A

16

B

B’

8

SRAM B

0

Address

High

Figure 29. Strip Buffer Interface

Size of External Strip Memory

The minimum required size in bytes of the strip memory for each

format is:

Size = 2 x K x L x PAX x D bytes

where values of K and L are determined from Table 17. D = 1

when HORZ = 0 and D = 0.5 when HORZ = 1. D = 1 always for

the 4:1:1 (H2V2) format. When RSTR = 1, L = 1 in any format.

Table 17: Calculation Parameters For Strip Memory

ZR36050 Image Format

Coef

K

1:0:0

1

4:2:2

2

4:1:1

(H2V2)

1.5

4:1:1

(H4V1)

1.5 [1]

4:4:4

3

L

8

8

16

8

8

1. K = 2 when HORZ = 1.

4:4:4:4

4

8

20

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