adv7152 Analog Devices, Inc., adv7152 Datasheet - Page 19

• Manufacturer Part Number: adv7152
• Description: Cmos 220 Mhz True-color Graphics Triple 10-bit Video Ram-dac
• Manufacturer: Analog Devices, Inc.

REV. B
DAC Test Register
(Address Reg (A7–A0) = 01H)
This register is used when the device is in test/diagnostic mode.
It is a 30-bit (10 bits each for RED, GREEN and BLUE) wide
read-only register which allows MPU access to the DAC port,
see “Test Diagnostic” section.
SYNC, BLANK and I
(Address Reg (A7–A0) = 02H)
This register is used when the device is in test/diagnostic mode.
It is a 3-bit wide (3 LSBs) read/write register which allows
MPU access to these particular pixel control bits, see “Test
Diagnostic” section.
ID Register
(Address Reg (A7–A0) = 03H)
This is an 8-bit wide “Identification” read-only register. For the
ADV7152 it will always return the hexadecimal value 8CH.
Pixel Mask Register (Address Reg (A7–A0) = 04H)
The contents of the pixel mask register are individually bit-wise
logically AND-ed with the Red, Green and Blue pixel input
stream of data. It is an 8-bit read/write register with D0 corre-
sponding to R0, G0 and B0. For normal operation, this register
is set with FFH.
PLL
CR19
CR19
CR19
CR19
Test Register
RESERVED
*
THESE BITS ARE READ-ONLY RESERVED BITS.
A READ CYCLE WILL RETURN ZEROS "00."
CR18
CR18
CR18
CR18
*
SET TO ZERO
CR17–CR13
THESE BITS
SHOULD BE
(00000)
CR17
Command Register 1 (CR1) (CR19–CR10)
CR16
CR15
SYNCOUT CONTROL
CR12
0
1
–19–
CR14
COMMAND REGISTER 1 (CR1)
(Address Reg (A7–A0) = 05H)
This register contains a number of control bits as shown in the
diagram. CR1 is a 10-bit wide register. However for program-
ming purposes, it may be considered as an 8-bit wide register
(CR18 to CR19 are reserved).
The diagram below shows the various operations under the con-
trol of CR1. This register can be read from as well as written to. In
write mode, “0” should be written to CR11 and CR13–CR17.
In read mode, CR11 and CR13–CR19 are returned as zeros.
COMMAND REGISTER 1 BIT DESCRIPTION
Calibration Control (CR10)
This bit automatically calibrates the onboard LOADIN/
LOADOUT synchronization circuit. MR15 of Mode Register
MR1 must be set to “0.”
SYNCOUT Control (CR12)
This bit specified whether the video SYNCOUT signal is to be
enabled. On power up a “0” is written to the bit and
“SYNCOUT” is set three-state.
DISABLE
ENABLE
SYNCOUT
CR13
CR12
SET TO ZERO
CALIBRATION CONTROL
SHOULD BE
THIS BIT
CR10
CR11
0
1
(0)
CR11
DISABLE
ON EVERY
VERTICAL
(MR15=0)
CALIBRATES
SYNC
CR10
ADV7152