ADV7152 datasheet(8/32 Pages) AD

Teilenummer	ADV7152

Bauteilbeschribung	CMOS 220 MHz True-Color Graphics Triple 10-Bit Video RAM-DAC

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ADV7152

–8–

REV. B

PIN FUNCTION DESCRIPTION

Mnemonic

Function

RED (R0A . . . R0B–R7A . . . R7B),

Pixel Port (TTL Compatible Inputs). 48 pixel select inputs, with 8 bits each for Red, 8

GREEN (G0A . . . G0B–G7A. . . G7B),

bits for Green and 8 bits for Blue. Each bit is multiplexed [A-B] 2:1 or 1:1. It can be

BLUE (B0A . . . B0B–B7A . . . B7B)

configured for 24-Bit True-Color Data, 8-Bit Pseudo-Color Data and 15-Bit True-Color

Data formats. Pixel Data is latched into the device on the rising edge of LOADIN.

PS0A . . . PS0B, PS1A . . . PS1B

Palette Priority Selects (TTL Compatible Inputs): These pixel port select inputs deter-

mine whether or not the device’s pixel data port is selected on a pixel by pixel basis. The

palette selects allow switching between multiple palette devices. The device can be pre-

programmed to completely shut off the DAC analog outputs. If the values of PS0 and

PS1 match the values programmed into bits MR16 and MR17 of the Mode Register,

then the device is selected. Each bit is multiplexed [A-B] 2:1 or 1:1. PS0 and PS1 are

latched into the device on the rising edge of LOADIN.

LOADIN

Pixel Data Load Input (TTL Compatible Input). This input latches the multiplexed

pixel data, including PS0–PS1, BLANK and SYNC into the device.

LOADOUT

Pixel Data Load Output (TTL Compatible Output). This output control signal runs at a

divided down frequency of the pixel CLOCK input. Its frequency is a function of the

multiplex rate. It can be used to directly or indirectly drive LOADIN

fLOADOUT = fCLOCK/M

where (M = 1 for 1:1 Multiplex Mode)

where (M = 2 for 2:1 Multiplex Mode).

PRGCKOUT

Programmable Clock Output (TTL Compatible Output). This output control signal

runs at a divided down frequency of the pixel CLOCK input. Its frequency is user

programmable and is determined by bits CR30 and CR31 of Command Register 3

fPRGCKOUT = fCLOCK/N

where N = 4, 8, 16 and 32.

SCKIN

Video Shift Clock Input (TTL Compatible Input). The signal on this input is internally

gated synchronously with the BLANK signal. The resultant output, SCKOUT, is a

video clocking signal that is stopped during video blanking periods.

SCKOUT

Video Shift Clock Output (TTL Compatible Output). This output is a synchronously

gated version of SCKIN and BLANK. SCKOUT, is a video clocking signal that is

stopped during video blanking periods.

CLOCK, CLOCK

Clock Inputs (ECL Compatible Inputs). These differential clock inputs are designed to

be driven by ECL logic levels configured for single supply (+5 V) operation. The clock

rate is normally the pixel clock rate of the system.

BLANK

Composite Blank (TTL Compatible Input). This video control signal drives the analog

outputs to the blanking level.

SYNC

Composite-Sync Input (TTL Compatible Input). This video control signal drives the

IOG analog output to the SYNC level. It is only asserted during the blanking period.

CR22 in Command Register 2 must be set if SYNC is to be decoded onto the analog

output, otherwise the SYNC input is ignored.

SYNCOUT

Composite SYNC O/P (TTL Compatible Output). This video output is a delayed ver-

sion of SYNC. The delay corresponds to the number of pipeline stages of the device.

D0–D9

Databus (TTL Compatible Input/Output Bus). Data, including color palette values and

device control information is written to and read from the device over this 10-bit, bidi-

rectional databus. 10-bit data or 8-bit data can be used. The databus can be configured

for either 10-bit parallel data or byte data (8+2) as well as standard 8-bit data. Any un-

used bits of the databus should be terminated through a resistor to either he digital

power plane (VCC) or GND.

CE

Chip Enable (TTL Compatible Input). This input must be at Logic “0” when writing to

or reading from the device over the databus (D0–D9). Internally, data is latched on the

rising edge of CE.

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