IC_ENABLE_STATUS

         Name: I2C Enable Status Register
Size: 3 bits
Address Offset: 0x9C
Read/Write Access: Read
The register is used to report the DW_apb_i2c hardware
status when the IC_ENABLE[0] register is set from 1 to 0;
that is, when DW_apb_i2c is disabled.
If IC_ENABLE[0] has been set to 1, bits 2:1 are forced to 0,
and bit 0 is forced to 1.
If IC_ENABLE[0] has been set to 0, bits 2:1 is only be valid
as soon as bit 0 is read as '0'.
Note
When IC_ENABLE[0] has been written with '0'a delay occurs for
bit 0 to be read as '0' because disabling the DW_apb_i2c
depends on I2C bus activities.
      
Module Instance Base Address Register Address
i_i2c_0_DW_apb_i2c_addr_block1 0xFFC02800 0xFFC0289C
i_i2c_1_DW_apb_i2c_addr_block1 0xFFC02900 0xFFC0299C

Size: 32

Offset: 0x9C

Access: RO

Important: The value of a reserved bit must be maintained in software. When you modify registers containing reserved bit fields, you must use a read-modify-write operation to preserve state and prevent indeterminate system behavior.
Bit Fields
31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16

RSVD_IC_ENABLE_STATUS

RO 0x0

15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0

RSVD_IC_ENABLE_STATUS

RO 0x0

SLV_RX_DATA_LOST

RO 0x0

SLV_DISABLED_WHILE_BUSY

RO 0x0

IC_EN

RO 0x0

IC_ENABLE_STATUS Fields

Bit Name Description Access Reset
31:3 RSVD_IC_ENABLE_STATUS
Reserved bits - Read Only
RO 0x0
2 SLV_RX_DATA_LOST
Slave Received Data Lost.
This bit indicates if a Slave-Receiver operation has been
aborted with at least one data byte received from an
I2C transfer due to the setting bit 0 of IC_ENABLE from 1 to 0.
When read as 1, DW_apb_i2c is deemed to have been actively engaged
in an aborted I2C transfer (with matching address) and the
data phase of the I2C transfer has been entered, even though
a data byte has been responded with a NACK.
NOTE: If the remote I2C master terminates the transfer with a
STOP condition before the DW_apb_i2c has a chance to NACK a
transfer, and IC_ENABLE[0] has been set to 0, then this bit is
also set to 1.
When read as 0, DW_apb_i2c is deemed to have been disabled without
being actively involved in the data phase of a Slave-Receiver transfer.
NOTE: The CPU can safely read this bit when IC_EN (bit 0) is
read as 0.
Reset value: 0x0
Value Description
0x0 Slave RX Data is not lost
0x1 Slave RX Data is lost
RO 0x0
1 SLV_DISABLED_WHILE_BUSY
Slave Disabled While Busy (Transmit, Receive).
This bit indicates if a potential or active Slave
operation has been aborted due to the setting bit 0 of
the IC_ENABLE register from 1 to 0. This bit is set
when the CPU writes a 0 to the IC_ENABLE register
while: (a) DW_apb_i2c is receiving the address byte
of the Slave-Transmitter operation from a remote master;
OR, (b) address and data bytes of the Slave-Receiver
operation from a remote master.
When read as 1, DW_apb_i2c is deemed to have forced a
NACK during any part of an I2C transfer, irrespective
of whether the I2C address matches the slave address set
in DW_apb_i2c (IC_SAR register) OR if the transfer is
completed before IC_ENABLE is set to 0 but has not
taken effect.
NOTE: If the remote I2C master terminates the transfer
with a STOP condition before the DW_apb_i2c has a chance
to NACK a transfer, and IC_ENABLE[0] has been set to 0, then
this bit will also be set to 1.
When read as 0, DW_apb_i2c is deemed to have been disabled
when there is master activity, or when the I2C bus is idle.
NOTE: The CPU can safely read this bit when IC_EN (bit 0)
is read as 0.
Reset value: 0x0
Value Description
0x0 Slave is disabled when it is idle
0x1 Slave is disabled when it is active
RO 0x0
0 IC_EN
ic_en Status.
This bit always reflects the value driven
on the output port ic_en.
When read as 1, DW_apb_i2c is deemed to be in
an enabled state.
When read as 0, DW_apb_i2c is deemed completely
inactive.
NOTE: The CPU can safely read this bit anytime.
When this bit is read as 0, the CPU can safely
read SLV_RX_DATA_LOST (bit 2) and
SLV_DISABLED_WHILE_BUSY (bit 1).
Reset value: 0x0
Value Description
0x0 I2C disabled
0x1 I2C enabled
RO 0x0