ZR36050 Просмотр технического описания (PDF) - Unspecified

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ZR36050

JPEG IMAGE COMPRESSION PROCESSOR

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ADVANCE INFORMATION

ZR36050

CLK_IN

DSYNC

PIXEL

61

62

63

EOS

Figure 21. Activation of EOS at end of Scan in JPEG Baseline Decoding

In the example shown in Figure 20, the second block follows the

first with no break. This, however is not necessarily so; the first

sample of the second block could be separated from the last

sample of the first block by any number of clocks. For further dis-

cussion of this, see the DATA FLOW CONTROL section.

Note that if the system logic activates STOP at least 24 clock

cycles before the last data sample of the current block, the Pixel

Interface halts the flow of data at the end of the current block.

Otherwise, it halts the flow at the end of the next block.

Fast Preview Decoding

Figure 22 shows operation of the Pixel Interface in Fast Preview

decoding. It includes the EOS output indicating the end of a

scan. Note that in this mode, the Pixel Interface activates EOS

within 64 CLK_IN cycles after the last sample of the scan

appears on the PIXEL bus.

For each decoded block, the Pixel Interface outputs one

unsigned sample representing the DC coefficient of the block, on

the most significant eleven bits of the PIXEL bus, and forces the

least significant bit to zero. A sample can follow the previous

sample immediately, on the next clock, or the consecutive

samples can be separated by any number of clock cycles. In the

example shown, the last sample is separated from the previous

one by one clock cycle.

CLK_IN

DSYNC

PIXEL

EOS

Figure 22. Fast Preview Decoding, Showing EOS at end of Scan

24

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