Analog Devices ADSP-BF506F Hardware Reference Manual page 991

Table 21-7 lists the status flags and exception flags that are affected by the
command path state machine.
Table 21-7. RSI Command Path Status Flags
RSI_STATUS Flag
CMD_ACT
CMD_SENT
CMD_TIMEOUT
CMD_CRC_FAIL
CMD_RESP_END
CEATA_INT_DET
The command path operates in a half-duplex mode, so that commands
and responses can either be sent or received. If the state machine is not in
the SEND state, the
Figure 21-4 describes a typical command and response transfer, the
signal is sampled by the card and the host on the rising edge of
RSI_CMD
.
RSI_CLK
RSI_CMD S T
COMMAND
PATH SEND
STATE
S = START BIT
T = TRANSMITTER BIT
E = END BIT
Figure 21-4. RSI Command Transfer
The following sections describes the RSI command path states.
ADSP-BF50x Blackfin Processor Hardware Reference
Description
Command transfer is in progress
Command without response sent successfully
Response timeout occurred (64
Response CRC failure
Response CRC successful
CE-ATA command completion signal detected
output is in high impedance state.
RSI_CMD
E T
WAIT RECEIVE
Removable Storage Interface
cycles)
RSI_CLK
E
IDLE
State Flag Set in
WAIT_S
SEND
WAIT_S
RECEIVE
RECEIVE
CEATA_INT_WAIT
21-19