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ZR36050

JPEG IMAGE COMPRESSION PROCESSOR

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ADVANCE INFORMATION

ZR36050

Figure 18 shows activation of STOP by the Pixel Interface, and

the required response of the external system logic in halting the

flow of samples. The Pixel Interface activates STOP when three

of the four Coefficient Buffers are full, so the system must

respond by halting after the last sample of the current block.

The system must activate EOS together with the last image

sample of a scan, as shown in Figure 19.

JPEG Baseline Decoding

In JPEG Baseline decoding, the Pixel Interface places the data

samples on the most significant eight bits of the PIXEL bus and

zeros the other four bits.

Figure 20 and Figure 21 show the beginning and end of a scan,

respectively, in JPEG Baseline decoding.

CLK_IN

DSYNC

PIXEL

62

63

0

STOP

Figure 18. System Response to STOP in JPEG Baseline Encoding

CLK_IN

DSYNC

PIXEL

EOS

61

62

63

Figure 19. Activation of EOS at end of Scan in JPEG Baseline Encoding

CLK_IN

DSYNC

PIXEL

0

1

2

62

63

0

1

2

Figure 20. Beginning of a Scan in JPEG Baseline Decoding

23

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