ZR36060PQC datasheet(16/46 Pages) ETC

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Integrated JPEG CODEC

4.0 HOST INTERFACE

The host interface is a generic interface with an 8-bit bidirectional

data bus, 2-bit address bus (that indirectly maps a 1Kbyte

internal memory space), RD, WR, CS, and ACK pins. It supports

glueless interface to most microprocessors, microcontrollers,

and buses like the ISA.

When the Code interface is configured in Slave mode (see

section 5.0 “Code Interface”) some of the ZR36060 Host inter-

face pins have dual functions, as can be seen in Figure 15:

In this example SImgPol = SImgDat = VCLKPol = 0.

In this example SUBIMG is connected to POE to float the ZR36060 video bus.

SUBIMG changes state with resolution of one VCLK and at the rising edge of VCLKx2, in both 8-bit and 16-bit mode.

In 8-bit mode, the first pixel is enabled 2 VCLKx2 after SUBIMG changes state, and the last pixel is disabled 1 VCLKx2

after SUBIMG changes.

In 16-bit mode, the first pixel is enabled 3 VCLKx2 after SUBIMG changes state (this causes the first pixel from the

ZR36060 appear on the bus for 0.5 VCLK instead of a complete VCLK period). The last pixel is disabled 1 VCLKx2 after

SUBIMG changes, to avoid contention. This timing was chosen to match the characteristics of the SAA7110.

Figure 14. SUBIMG and POE timing during decompression, shown for 8- and 16-bit video

VCLKx2

VCLK

Y[7:0] from ZR36060

SUBIMG (POE)

8-Bit Video Interface

2 VCLKx2

Y[7:0] External

16-Bit Video Interface

Y[7:0] from ZR36060

UV[7:0] from

ZR36060

SUBIMG (POE)

Y[7:0] External

(SAA7110)

UV[7:0] External

(SAA7110)

Notes:

1 VCLKx2

3 VCLKx2

1 VCLKx2

Sampled by

SAA7110

Sampled by

SAA7110

CODE[7:0]

CCS

COE

CWE

CBUSY

ACK

DATA[7:0]

ADDR[1:0]

ZR36060

a) Code Master Mode, 8-Bit Code Bus

Figure 15. The Various Code Interface Modes and the Host Interface

Code Only

Host Only

CBUSY

ACK

DATA[7:0]

ADDR[1:0]

ZR36060

b) Code Slave Mode, 8-Bit Code Bus

Code/Host

Shared

CODE[7:0]

CBUSY

ACK

DATA[7:0]

ADDR[1:0]

ZR36060

c) Code Slave Mode, 16-Bit Code Bus

Code

(Data Bus

Extension)

Code

Code/Host

Shared

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