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參數資料
| 型號： | ADV7150 |
| 廠商： | Analog Devices, Inc. |
| 英文描述： | CMOS 220 MHz True-Color Graphics Triple 10-Bit Video RAM-DAC(三通道,10位視頻RAM-D/A轉換器) |
| 中文描述： | 220兆赫的CMOS真彩色圖形三路10位顯存，數模轉換器（三通道，10位視頻RAM的的D / A轉換器） |
| 文件頁數： | 20/36頁 |
| 文件大小： | 434K |
| 代理商： | ADV7150 |
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ADV7150
–20–
REV. A
Power-On Reset
On power-up of the ADV7150 executes a power-on reset opera-
tion. T his initializes the pixel port such that the pixel sequence
ABCD starts at A. T he Mode Register (MR17–MR10), Com-
mand Register 2 (CR27–CR20) and Command Register 3
(CR37–CR30) have all bits set to a Logic “1.” Command Regis-
ter 1 (CR17–CR10) has all bits set to a Logic “0.”
T he output clocking signals are also set during this reset period.
PRGCK OUT = CLOCK /32
LOADOUT = CLOCK /4
T he power-on reset is activated when V
AA
goes from 0 V to
5 V. T his reset is active for 1
μ
s. T he ADV7150 should not be
accessed during this reset period. T he pixel clock should be
applied at power-up.
RE GIST E R PROGRAMMING
T he following section describes each register, including Address
Register, Mode Register and each of the nine Control Registers
in terms of its configuration.
Address Register (A7–A0)
As illustrated in the previous tables, the C0 and C1 control in-
puts, in conjunction with this address register specify which
control register, or color palette location is accessed by the
MPU port. T he address register is 8-bits wide and can be read
from as well as written to. When writing to or reading from the
color palette on a sequential basis, only the start address needs
to be written. After a red, green and blue write sequence, the
address register is automatically incremented.
MODE RE GIST E R MR1 (MR19–MR10)
T he mode register is a 10-bit-wide register. For programming
purposes, however, it may be considered as an 8-bit-wide regis-
ter (MR18 and MR19 are both reserved). It is denoted as
MR17–MR10 for simplification purposes.
T he diagram shows the various operations under the control of
the mode register. T his register can be read from, as well as writ-
ten to. In read mode, if MR18 and MR19 are read back, they
are both returned as zeros.
Mode Register (MR17–MR10) Bit Description
Reset Control (MR10)
T his bit is used to reset the pixel port sampling sequence. T his
ensures that the pixel sequence ABCD starts at A. It is reset by
writing a “1” followed by a “0” followed by a “1.” T his bit must
be run through this cycle during the initialization sequence.
RAM-DAC Resolution Control (MR11)
When this is programmed with a “1,” the RAM is 30 bits deep
(10 bits each for red, green and blue) and each of the three
DACs is configured for 10-bit resolution. When MR11 is
programmed with a “0,” the RAM is 24-bits deep (8 bits each
for red, green and blue) and the DACs are configured for 8-bit
resolution. T he two LSBs of the 10-bit DACs are pulled down
to zero in 8-bit RAM-DAC mode.
MPU Databus Width (MR12)
T his bit determines the width of the MPU port. It is configured
as either a 10-bit wide (D9–D0) or 8-bit wide (D7–D0) bus.
10-bit data can be written to the device when configured in
8-bit wide mode. T he 8 MSBs are first written on D7–D0, then
the two LSBs are written over D1–D0. Bits D9–D8 are zeros in
8-bit mode.
Operational Mode Control (MR14–MR13)
When MR14 is “0” and MR13 is “1,” the part operates in
normal mode.
Calibrate LOADIN (MR15)
T his bit automatically calibrates the onboard L OADIN/
LOADOUT synchronization circuit. A “0” to “1” transition
initiates calibration. T his bit is set to “0” in normal operation.
See “Pipeline Delay and Calibration” section. T his bit must be
run through this cycle during the initialization sequence.
MR17
MR16
* THESE BITS ARE READ-ONLY RESERVED BITS.
A READ CYCLE WILL RETURN ZEROS "00."
RESERVED*
MR16 PS0
MR17 PS1
PALETTE SELECT
MATCH BITS CONTROL
RAM-DAC
RESOLUTION CONTROL
0 8-BIT
1 10-BIT
MR11
MPU DATA BUS WIDTH
0 8-BIT (D7–D0)
1 10-BIT (D9–D0)
MR12
CALIBRATE
LOADIN
MR15
RESET CONTROL
MR10
OPERATIONAL MODE CONTROL
0 0 RESERVED
0 1 NORMAL OPERATION
1 0 RESERVED
1 1 RESERVED
MR14 MR13
MR19
MR18
MR15
MR14
MR13
MR12
MR11
MR10
Mode Register 1 (MR1) (MR19–MR10)
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| ADV7150LS110 | 制造商:AD 制造商全稱:Analog Devices 功能描述:CMOS 220 MHz True-Color Graphics Triple 10-Bit Video RAM-DAC |
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