CS7654 datasheet(16/62 Pages) CIRRUS

Part #	CS7654

Description	CCD COLOR SPACE PROCESSOR WITH ANALOG OUTPUT

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Manufacturer	CIRRUS [Cirrus Logic]

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CS7654

16

software and the device. Typically the host would

write all 4 bytes to be inserted into the registers and

then enable closed caption insertion and interrupts.

As the closed caption interrupts occur the host soft-

ware would respond by writing the next two bytes

to be inserted to the correct control registers and

then clear the interrupt and wait for the next field.

Control Registers

The control and configuration of the CS7654 is ac-

complished primarily through the control register

block. All of the control registers are uniquely ad-

dressable via the internal address register. The con-

trol register bits are initialized during device

RESET.

See the Programming section of this data sheet for

the individual register bit allocations, bit operation-

al descriptions, and initialization states.

The registers of the CS7654 are located in two sep-

arate Station Address ( SA ), the first one at 0x00h

and the second one at 0x34h. Be careful to select

the proper SA when accessing register because

some registers have the same address but are locat-

ed in a different Station Address. Note that both

sections of this device cannot bear the same I2C ad-

dress.

Testability

The digital circuits are completely scanned by an

internal scan chain, thus providing close to 100%

fault coverage.

OPERATIONAL DESCRIPTION

Reset Hierarchy

The CS7654 is equipped with an active low asyn-

chronous reset input pin, RESET. RESET is used to

initialize the internal registers and the internal state

machines for subsequent default operation. See the

electrical and timing specification section of this

data sheet for specific CS7654 device RESET and

power-on signal timing requirements and restric-

tions.

While the RESET pin is held low, the host interface

in the CS7654 is disabled and will not respond to

host-initiated bus cycles. All outputs are valid after

a time period following RESET pin low.

A device RESET initializes the CS7654 internal

registers to their default values as described by Ta-

ble 13 and 14, Control Registers. In the default

state, the CS7654 video DACs are disabled and the

device is internally configured to provide blue field

video data to the DACs (any input data present on

the V [7:0] pins is ignored at this time). Otherwise,

the CS7654 registers are configured for NTSC-M

ITU R.BT601 output operation. At a minimum, the

DAC Registers 0x04 and 0x05 at Station Address

0x00 must be written (to enable the DACs) and the

IN_MODE bit of the CONTROL_0 SA 0x00, Reg-

ister (0x00) must be set (to enable ITU R.BT601

data input on V [7:0]) for the CS7654 to become

operational after RESET.

Vertical Timing

The CS7654 encoder section can be configured to

operate in any of four different analog timing

modes: PAL, which is 625 vertical lines, 25 frames

per second interlaced; NTSC, which is 525 vertical

lines, 30 frames per second interlaced; and either

PAL or NTSC in Progressive Scan, in which the

display is non-interlaced. These modes are selected

in the CONTROL_0 Register (0x00) at SA

0x00h.Note that there are several digital mode

(scaler settings ) which will not have an equivalent

analog timing mode.

The CS7654 conforms to standard digital decom-

pression dimensions and does not process digital

input data for the active analog video half lines as

they are typically in the over/underscan region of

televisions. 240 active lines total per field are pro-

cessed for NTSC, and 288 active lines total per

field are processed for PAL. Frame vertical dimen-

sions are 480 lines for NTSC and 576 lines for

PAL. Table 3 specifies active line numbers for both

NTSC and PAL.

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