參數(shù)資料
型號(hào)： EVAL-ADV7180-32EBZ
廠商： Analog Devices Inc
文件頁數(shù)： 94/116頁
文件大小： 0K
描述： BOARD EVAL FOR ADV7180
標(biāo)準(zhǔn)包裝： 1
系列： Advantiv®
主要目的： 視頻，SDTV 視頻解碼器 - NTSC，PAL，SECAM
嵌入式： 否
已用 IC / 零件： ADV7180
主要屬性： CVBS（復(fù)合），Y/C（S 視頻）和 YPrPb（元件）輸入
次要屬性： 8 位 ITU-R BT.656 YCrCb 4:2:2 輸出
已供物品： 板
Data Sheet
ADV7180
Rev. I | Page 79 of 116
REGISTER ACCESS
The MPU can write to or read from all of the ADV7180 registers
except the subaddress register, which is write only. The subaddress
register determines which register the next read or write operation
accesses. All communications with the part through the bus start
with an access to the subaddress register. A read/write operation is
then performed from or to the target address, which increments
to the next address until a stop command on the bus is performed.
REGISTER PROGRAMMING
The following sections describe the configuration for each
register. The communication register is an 8-bit, write-only
register. After the part is accessed over the bus and a read/write
operation is selected, the subaddress is set up. The subaddress
register determines to or from which register the operation
takes place. Table 105 lists the various operations under the
control of the subaddress register for the control port.
SUB_USR_EN, Address 0x0E[5]
This bit splits the register map at Register 0x40.
COMMON I2C SPACE
ADDRESS 0x00
≥ 0x3F
ADDRESS 0x0E BIT 5 = 0b
ADDRESS 0x0E BIT 5 = 1b
I2C SPACE
ADDRESS 0x40
≥ 0xFF
I2C SPACE
ADDRESS 0x40
≥ 0x9C
USER MAP
USER SUB MAP
NORMAL REGISTER SPACE
INTERRUPT AND VDP REGISTER SPACE
05700-
050
Figure 55. Register Access—User Map and User Sub Map
I2C SEQUENCER
An I2C sequencer is used when a parameter exceeds eight bits
and is therefore distributed over two or more I2C registers, for
example, HSB[10:0].
When such a parameter is changed using two or more I2C write
operations, the parameter may hold an invalid value for the
time between the first I2C being completed and the last I2C
being completed. In other words, the top bits of the parameter
may hold the new value while the remaining bits of the parameter
still hold the previous value.
To avoid this problem, the I2C sequencer holds the updated bits
of the parameter in local memory, and all bits of the parameter
are updated together once the last register write operation has
completed.
The correct operation of the I2C sequencer relies on the following:
All I2C registers for the parameter in question must be
written to in order of ascending addresses. For example,
for HSB[10:0], write to Address 0x34 first, followed by
Address 0x35, and so on.
No other I2C can take place between the two (or more) I2C
writes for the sequence. For example, for HSB[10:0], write to
Address 0x34 first, immediately followed by Address 0x35,
and so on.
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