Idle State; Pend State; Send State - Analog Devices ADSP-BF506F Hardware Reference Manual

Functional Description

IDLE State

The command path state machine remains in the IDLE state when not
active. The command path state machine becomes enabled and leaves the
IDLE state once the
will transition to the PEND state if the
; otherwise it will enter the SEND state.
RSI_COMMAND
When the command path state machine returns to the IDLE state from
one of the other states and the result of the return is not due to the RSI
being disabled or reset, the state machine will remain in the IDLE state for
at least eight
RSI_CLK
drive the
RSI_CLK
required in order to allow the card to complete the current operation.
Only after the eight
leave the IDLE state if enabled again.

PEND State

The PEND state is entered if the
. The state machine remains in the PEND state until it is
RSI_COMMAND
notified by the data path sub block that a data transfer has completed.
This is indicated by the
RSI_DATA_CNT
automatic transmission of a
writing the required amount of data for stream-based transactions.

The
CMD_PEND_EN
and cannot be used to automatically issue the
command for
operations.

SEND State

During the SEND state, the RSI sets the
indicate a transfer is in progress. The behavior of the state machine upon
21-20
bit of the
CMD_EN
cycles. During this time, the RSI will continue to
signal even if the
cycles have passed will the state machine
RSI_CLK
DAT_END
decrementing to zero. This mode is intended to enable the
STOP_TRANSMISSION
feature is not functional for block-based transfers
MULTIPLE_BLOCK_READ
ADSP-BF50x Blackfin Processor Hardware Reference
register is set. The state
RSI_COMMAND
CMD_PEND_EN
feature is enabled. This is
PWR_SV_EN
bit is set within
CMD_PEND_EN
flag being set as a result of the
command after reading or
or
MULTIPLE_BLOCK_WRITE
flag in
CMD_ACT
bit is set within
STOP_TRANSMISSION
to
CMD_STATUS