MCZ33784EF/R2- FREESCALE [Freescale Semiconductor, Inc], MCZ33784EF/R2- Datasheet - Page 24

• Manufacturer Part Number: MCZ33784EF/R2-
• Description: DSI 2.02 Sensor Interface
• Manufacturer: FREESCALE [Freescale Semiconductor, Inc]

FORMAT CONTROL REGISTERS
Figure
select the Format Control Register to which data is written or
from which data is read. The data is 4 bits.
Table 9. Format Control Registers
CRC POLYNOMIAL
Polynomial. The MSB represents the X3 bit. The LSB
represents X0 or the value 1 if set or 0 if not set. The standard
DSI CRC of X
Format register 0. The X
nothing has to be done for it. On a reset or clear, the standard
DSI CRC taps are loaded into these registers.
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33784
FUNCTIONAL DEVICE OPERATION
LOGIC COMMANDS AND REGISTERS
R/W
Legend
A [3:0] = Address bits. The address of the selected device.
R/W = Controls if this is a read or write. Write = 1.
ADDR[2:0] = Pointer to Format control register which is to be accessed.
Register Address
A3
The enhanced DSI Register locations are shown in
The CRC Taps control the feedback for the CRC
Format Control
9. The ADDR bits in the Format Control Command
ADD
R2
A2
0
1
2
3
4
5
6
7
4
+1 would be obtained by loading 0001 into the
ADD
R1
A1
CRC Polynomial
Reserved
Seed
Reserved
Reserved
Short-Word Data Length
Reserved
Format Selection
ADD
R0
A0
4
Data
pin is always considered on, so
Data
3
0
Figure 17. Format Control Command and Response Format
Description
Data
2
0
Data
1
0
Data
Response
0
0
R/W
A3
ADD
R2
A2
Address
SEED
checking registers before each transaction starts. The default
DSI seed of 1010 would be selected by loading 1010 into
control register 2. On reset or clear, the standard DSI seed is
loaded into this register.
SHORT-WORD DATA LENGTH
data in a short word. This can be set to 8 or 10. On a reset or
clear, the value in this register defaults to 8. If a number other
than 8 or 10 is written to the register, it is ignored and the
contents of the register are not changed. The standard DSI
short-word data length would be set by loading 1000 into this
register.
FORMAT SELECTION
DSI values will be used or the values in the Format register.
The switch to the values in the format registers occurs when
1111 is successfully written to control register 7 in a single
command. If the register is currently cleared, and one of the
data bits is not received as a logic [1], the data in the register
will remain all zeroes and the device will not use the Format
register settings. A switch back to standard DBUS occurs
when a ‘0000’ is successfully written to control register 7. If
the registers bits are all set, and one of the bits is received as
a logic [1], the value of the bits in the register will remain 1111
and the switch back to Standard DSI values will not occur.
This is done to reduce the possibility of switching operation
modes due to a corrupted command. When using the Format
Register settings, any command to change them, other than
this register back to 0000, will be ignored.
No Response
ADD
DATA[3:0] = Data to read from or write to in the pointed to Format
Control Register.
R1
The Seed is the starting value loaded into the CRC
The Short-Word Data Length controls the number of bits of
The Format selection determines whether the standard
A1
Not Valid
No Response
ADD
A0
Not Valid
R0
DAT
A3
1
DAT
Analog Integrated Circuit Device Data
Command
A2
0
DAT
A1
1
Freescale Semiconductor
DAT
A0
0
SW & ESW (8-bit)
SW & ESW (8-bit)
ESW (10-bit)
ESW (10-bit)
Word Type
Word Type
LW & ELW
LW & ELW