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參數(shù)資料
| 型號： | VPX3214C |
| 廠商： | Electronic Theatre Controls, Inc. |
| 英文描述： | Video Pixel Decoders |
| 中文描述： | 視頻解碼器像素 |
| 文件頁數(shù)： | 27/80頁 |
| 文件大?。?/td> | 752K |
| 代理商： | VPX3214C |
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VPX 3220 A, VPX 3216 B, VPX 3214 C
PRELIMINARY DATA SHEET
MICRONAS INTERMETALL
27
4. Serial Interface A
4.1. Overview
Communication between the VPX and the external con-
troller is performed serially via the I
2
C-bus (pins SCL
and SDA).
There are basically two classes of registers in the VPX.
The first class of registers are the directly addressable
I
2
C registers. These are registers embedded directly in
the hardware. Data written to these registers is inter-
preted combinatorially directly by the hardware (as in
any register driven state machine). These registers are
all a maximum of 8 bits wide.
The second class of registers are the ‘FP RAM regis-
ters’: the RAM memory of the on-board microcontroller
(INTERMETALL’s Fast Processor). Data written into this
class of registers is read and interpreted by the FP’s mi-
cro-code. Internally, these registers are 12 bits wide.
Communications with these registers requires I
2
C pack-
ets with 16-bit data payloads.
Communication with both classes of registers (I
2
C and
FP RAM) is performed via I
2
C. But the format of the I
2
C
telegram depends on which type of register is being ad-
dressed.
4.2. I
2
C-Bus Interface
The VPX has an I
2
C-bus slave interface and uses I
2
C
clock synchronization to slow down the interface if re-
quired. The I
2
C-bus interface uses one level of subad-
dressing. First, the bus address selects the IC, then a
subaddress selects one of the internal registers.
The I
2
C interface of the VPX conforms to the I
2
C-bus
specification for the fast-mode. It incorporates slope
control for the falling edges of the SDA and SCL signals.
If the power supply of the VPX is switched off, both pins
SCL and SDA float. External pull-up devices must be
adapted to fulfill the required rise time for the fast-mode.
For bus loads up to 200 pF, the pull-up device could be
a resistor; for bus loads between 200 pF and 400 pF, the
pull-up device can be a current source (3 mA max.) or
a switched resistor circuit.
4.3. Reset and IC Address Selection
The VPX can respond to one of two possible chip ad-
dresses. The address selection is made at reset by an
externally supplied level on the PREF pin. This level is
latched onto the inactive going edge of RES.
4.4. Protocol Description
Once the reset is complete, the IC is selected by assert-
ing a the device address in the address part of a I
2
C
transmission. A device address pair is defined as a write
address (86 hex or 8e hex) and a read address (87 hex
or 8f hex). Writing is done by sending the device write ad-
dress first, followed by the subaddress byte and one or
two data bytes. For reading, the read address has to be
transmitted first by sending the device write address (86
hex or 8e hex), followed by the subaddress, a second
start condition with the device read address (87 hex or
8f hex) and reading one or two bytes of data.
The I
2
C-bus device addresses are
A6
A5
A4
A3
A2
A1
A0
R/W
hex
1
0
0
0
0
1
1
1/0
86/87
1
0
0
0
1
1
1
1/0
8e/8f
The registers of the VPX have 8 or 16-bit data size;
16-bit registers are accessed by reading/writing two
8-bit data bytes with the high byte first. The order of the
bits in a data/address/subaddress byte is always MSB
first.
Write to Hardware Control Registers
S
1 0 0 0 0 1 1 0
ACK
sub-addr
ACK
send data-byte
ACK
P
Read from Hardware Control Registers
S
1 0 0 0 0 1 1 0
ACK
sub-addr
ACK
S
1 0 0 0 0 1 1 1
ACK
receive data-byte
NAK
P
Note:
S =
I
2
C-Bus Start Condition
I
2
C-Bus Stop Condition
ACK = Acknowledge-Bit (active low on SDA from receiving device)
NAK = No Acknowledge-Bit (inactive high on SDA from receiving device)
P =
Before accessing the address or data registers for the FP interface (FPRD, FPWR, FPDAT), make sure that the busy
bit of FP is cleared (FPSTA).
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| VPX3214C(PLCC44) | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Color Decoder Circuit |
| VPX3214C(QFP44) | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Color Decoder Circuit |
| VPX3216B | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Video Pixel Decoders |
| VPX3216B(PLCC44) | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Color Decoder Circuit |
| VPX3216B(QFP44) | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Color Decoder Circuit |
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