General Call Support - Analog Devices ADSP-BF506F Hardware Reference Manual

Description of Operation

General Call Support

The TWI controller always decodes and acknowledges a general call
address if it is enabled as a slave (
general call addressing (0x00) is indicated by the
by nature of the transfer the TWI controller is a slave-receiver. If the data
associated with the transfer is to be NAK'ed, the
If the TWI controller is to issue a general call as a master-transmitter the
appropriate address and transfer direction can be set along with loading
transmit FIFO data.

The byte following the general call address usually defines what
action needs to be taken by the slaves in response to the call. The
command in the second byte is interpreted based on the value of its
LSB. For a TWI slave device, this is not applicable, and the bytes
received after the general call address are considered data.
Fast Mode
Fast mode essentially uses the same mechanics as standard mode of opera-
tion. It is the electrical specifications and timing that are most affected.
When fast mode is enabled (
meet the electrical requirements.
• Serial data rise times before arbitration evaluation (t
• Stop condition set-up time from serial clock to serial data
(t
SU;STO
• Bus free time between a stop and start condition (t
16-10
SEN
) the following timings are modified to
FAST
)
ADSP-BF50x Blackfin Processor Hardware Reference
) and if general call is enabled (
GCALL
bit can be set.
NAK
).
GEN
bit being set and
)
r
)
BUF