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33793 Datasheet PDF : 24 Pages
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Freescale Semiconductor, Inc.
Request ID Response
This response message is sent during the next message
following a valid long-word Request ID command to the
addressed device. The response format is found in Table 14.
The high byte is omitted during the short-word response. No
response is generated if the command address field was $0.
Table 14. Request ID Response Format
Address
Status
Data
CRC
A3 A2 A1 A0 0 0 0 0 V2 V1 V0
0
0
0
1
1 X3 X2 X1 X0
Legend
A[3:0] = Address bits. The slave address.
V[2:0] = Device version number. The silicon version number of
the device. For this device the device type is 00011 as indicated
by the lowest bits.
X[3:0] = Cyclic Redundancy Check (CRC). The CRC as calculated by
the slave.
Clear Command
This command will open the bus switch and reset all
registers to the reset state. The command format is found in
Table 15. No response is generated for the Clear command.
Table 15. Clear Command Format
Data
Address
Command
CRC
–––– –
–
–
– A3 A2 A1 A0 0 1 1 1 X3 X2 X1 X0
Legend
A[3:0] = Address bits. The address of the selected device.
An address value of “0000” clears all devices.
X[3:0] = Cyclic Redundancy Check (CRC). The CRC as calculated
by the master.
Read/Write NVM Command
If the NV bit has been set by a previous Initialization
command and the NVM has not been programmed previously,
this command will permanently program the device’s one-time
programmable address and return the programmed value
during the next message time. Once programmed, this
nonvolatile address is used to set the device address register
on the next and all subsequent power-ups. If the device is not
blank, this command will return the programmed value during
the next message time.
Programming the NVM address to $0 is allowed. This
ensures that the device always acts as a dynamically
addressable device and would be immune to any inadvertent
future NVM programming sequences.
Reads and writes are long-word commands only. The
command format is found in Table 16.
Table 16. Read/Write NVM Command Format
Data
Address
Command
CRC
1 1 1 1 PA3 PA2 PA1 PA0 A3 A2 A1 A0 1 0 0 1 X3 X2 X1 X0
Legend
A[3:0] = Address bits. These bits are the address of the
device previously sent with the Initialization command. They
must match the address in the PA[3:0] field and the address
stored in the device address register.
PA[3:0] = Program Address bits. These bits are the address that is
to be programmed into the slave.
X[3:0] = Cyclic Redundancy Check (CRC). The CRC as calculated
by the master.
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For More Information OMnOTTOhRiOsLAPrAoNdAuLOcGt,INTEGRATED CIRCUIT DEVICE DATA
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