SMH4042 Datasheet, PDF (14/28 Pages) Summit Microelectronics, Inc. – Hot Swap™ Controller

SMH4042
Sequential READ
Sequential reads can be initiated as either a current
address READ or random access READ. The first word is
transmitted as with the other byte read modes (current
address byte READ or random address byte READ);
however, the master now responds with an
ACKnowledge, indicating that it requires additional data
from the SMH4042. The SMH4042 continues to output
data for each ACKnowledge received. The master termi-
nates the sequential READ operation by not responding
with an ACKnowledge, and issues a STOP conditions.
During a sequential read operation, the internal address
counter is automatically incremented with each acknowl-
edge signal. For read operations, all address bits are
incremented, allowing the entire array to be read using a
single read command. After a count of the last memory
address, the address counter will ‘roll-over’ and the
memory will continue to output data.
Data Download
The SMH4042 supports a proprietary mode of operation
specifically for the Hot Swap environment. After a power
on reset the internal address pointer is reset to 00. The
host or ASIC then only needs to issue a read command
and then sequentially clock out data starting at
address 00.
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