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�� Maxim Integrated Products 21

MAX9257A/MAX9258A

Fully Programmable Serializer/Deserializer

with UART/I

C Control Channel

Figure 19. Video and Control Channel Phases (Spread Off)

Detailed Description

The MAX9257A serializer pairs with the MAX9258A

deseri alizer to form a complete digital video serial link.

The electronic control unit (ECU) programs the registers

in the MAX9257A, MAX9258A, and peripheral devices,

such as a camera, during the control channel phase that

occurs at startup or during the vertical blanking time.

All control channel communication is half-duplex. The

UART communication between the MAX9258A and the

MAX9257A is encoded to allow transmission through

AC-coupling capacitors. The MAX9257A communicates

to the peripheral device through UART or I

The MAX9257A/MAX9258A DC-balanced serializer and

deserializer operate from a 5MHz-to-70MHz parallel

clock frequency, and are capable of serializing and

deserializing programmable 10, 12, 14, 16, and 18

bits parallel data during the video phase. The devices

have two phases of operation: video and control chan-

nel (Figure 19 and 20). During the video phase, the

MAX9257A accepts parallel video data and transmits

serial encoded data over the LVDS link. The MAX9258A

accepts the encoded serial LVDS data and converts

it back to parallel output data. The MAX9257A has

dedicated inputs for HSYNC and VSYNC. The selected

VSYNC edge causes the MAX9257A/MAX9258A to enter

the control channel phase. Nonactive VSYNC edge can

be asserted after eight pixel clock cycles.

Figure 20. Video and Control Channel Phases (MAX9257A Spread is Enabled)

VIDEO

HSK

CONTROL

VSYNC_IN

SDI/O

CCEN

HSK = HANDSHAKING

VIDEO

HSK

CONTROL

VSYNC_IN

SDI/O

CCEN

HSK = HANDSHAKING

0.5/f

SSM

(max)

SPREAD

PROFILE