TW2864D datasheet(24/110 Pages) RENESAS

24 / 110 page

TW2864

FN7745 Rev. 0.00

Page 24 of 110

September 28, 2012

TWO CHANNEL ITU-R BT.656 TIME-MULTIPLEXED FORMAT WITH 54MHz

The TW2864 supports two channels ITU-R BT.656 time-multiplexed format with 54MHz that is useful to security

application requiring two channel outputs through one channel video port. The DUAL_CH register enables the dual

ITU-R BT.656 time-multiplexed format and the SEL_CH register selects another channel output to be multiplexed with

its own channel on each VD pins. To de-multiplex the time-multiplexed data in the back end chip, the channel ID can

be inserted in the data stream using the CHID register. Two kinds of channel ID format can be supported. One is

horizontal blanking code with channel ID and the other is ITU-R BT.656 sync code with channel ID. Figure 10

illustrates the timing diagram in the case of CH1 and CH2 time-multiplexed output through CH1 video output port.

CLKP

(27MHz)

CH1

CH2

VD1_54M

Y50

Cr50

Y51

Cb52 Cb0

Y52

Cr52 Cb0

Y53

Cb54 Cb2

Y54

Cr54 Cr2

Y55

Cb56 Cb4

Y56

Cr56

CLKN

(27MHz)

Y50

Cr50

Y51

Cb52

Y52

Cr52

Y53

Cb54

Y54

Cr54

Y55

Cb56

Y56

Cr56

Cb0

Cr0

Cb2

Cr2

Cb4

FIGURE 10. TIMING DIAGRAM OF TWO CHANNEL TIME-MULTIPLEXED FORMAT WITH 54MHZ

FOUR CHANNEL CIF TIME-MULTIPLEXED FORMAT WITH 54MHZ

Four channel CIF (360x480) time-multiplexed format is also provided for specific security application using the

CIF_54M register. For this format, each channel ITU-R BT.656 data stream is down-sampled into 13.5MHz ITU-R

BT.656 data stream except the sync code. Optionally, the vertical scaling can also be enabled to support Quad

(360x240) format using the VSCALE(REV_ID=0 TW2864)/VSCL_ENA(REV_ID>=1 TW2864) register. Then, these four

13.5MHz ITU-R BT.656 data stream are time-multiplexed into 54MHz data stream. This format requires only one

channel video port to transfer whole four channel CIF data independently.When CIF_54M register is set to

1,TW2864(REV_ID=0) output

this four channel CIF (360x480) time-multiplexed format on all video

ports.TW2864(REV_ID>=1) can support one channel video port to transfer whole four channel CIF data independently

and the other video port to transfer two channel Full D1 ITU-R BT.656 time-multiplexed format simultaneously.To de-

multiplex the time-multiplexed data in the back end chip, the channel ID can be inserted in the data stream using the

CHID register. Two kinds of channel ID format can be supported. One is horizontal blanking code with channel ID and

the other is ITU-R BT.656 sync code with channel ID. Optionally, when the vertical scaling is enabled, the ITU-R BT.656

sync code will be skipped in the invalid line through the VSCL_SYNC register. Figure 11 and Table 4 illustrate the

timing diagram and detailed channel ID format for four channel CIF time-multiplexed format with 54MHz.

TW2864D Datasheet(PDF) 24 Page - Renesas Technology Corp

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