ZR36060PQC datasheet(21/46 Pages) ETC

21 / 46 page

Integrated JPEG CODEC

constitute a legal preamble for the SOI marker code of the next

field, and thus are ignored by the ZR36060.

In 8-bit interface mode, the number of appended bytes can be 1,

2, 3 or 4.

In 16-bit interface mode, the number of appended bytes can be

2, 3, 4 or 5.

Note that in both cases, if the number of bytes from the first byte

of SOI up to and including the second byte of EOI is an exact

multiple of 4, the ZR36060 actually appends 4 more bytes. Note

also that in 16-bit mode, if one byte is required to make the total

a multiple of 4, the ZR36060 actually appends 5 bytes.

5.2.3 Transition between fields in compression

For compression, Figure 24 shows code transfer with 8-bit inter-

face and Figure 25 with 16-bit interface, at the transition between

consecutive fields showing the behavior of the EOI, END and

CBUSY signals.

CBUSY is asserted after the last padding byte has been read

out. It remains asserted continuously until the first code byte of

the next field is available. A code read is shown in the figures

while CBUSY is asserted, with the host access stalled.

EOI is asserted as soon as the read cycle of last byte of the EOI

marker code (0xD9) is completed.

END is asserted only after the all the compressed data, including

the padding bytes, was read out, and the post-compression cal-

culations are completed and their results stored in the host-

accessible registers. At this time the ZR36060 returns to the

IDLE state. Compression of the next field is started when the

ZR36060 senses the START signal active.

Figure 24. 8-Bit Code Slave Mode Compression, Transistion Between Consecutive Fields

ADDR[1:0]

ACK

CBUSY

EOI

DATA[7:0]

END

32-Bit Alignment (Worst Case Padding)

CODE for Field N

CODE for Field N+1

Start-Of-Image marker

End-Of-Image marker

End of Field

Process

Start new field process

due to START

Figure 25. 16-Bit Code Slave Mode Compression, Transistion Between Consecutive Fields

ADDR[1:0]

ACK

CBUSY

EOI

DATA[7:0]

XXXX

XXFF

D9FF

FFFF

END

FFFF

FFD8

FFXX

32-Bit Alignment

(Worst Case Padding)

CODE for Field N

CODE for Field N+1

Start-Of-Image marker

End-Of-Image marker

End of Field

Process

Start new field process

due to START

CODE[7:0]

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