Read data from the epcs/epcq/epcq-l device – Altera Active Serial Memory Interface User Manual
Page 22
Related Information
•
For more information about the block protection level for EPCQ devices. Every devices have different
block protection level.
•
For more information about the block protection level for EPCQ-L devices. Every devices have
different block protection level.
Read Data from the EPCS/EPCQ/EPCQ-L Device
Use the
read
signal to instruct the IP core to read data from the EPCS/EPCQ/EPCQ-L device. The Altera
ASMI Parallel IP core supports two types of read data operation: multiple-byte and single-byte read.
Figure 6: Reading Multiple-Byte
This figure shows an example of the latency when the Altera ASMI Parallel IP core is executing multiple-
byte read command. The latency shown does not correctly indicate the true processing time. It shows the
command only.
Figure 7: Reading Single-Byte
This figure shows an example of single-byte read command. The latency shown does not correctly
indicate the true processing time. It shows the command only.
The IP core registers the
read
signal on the rising edge of the
clkin
signal. After the IP core
receives the read command, it asserts the
busy
signal to indicate that the read command is in
progress.
Ensure that the read address appears on the
addr[23..0]
signal before asserting the
read
signal.
The
rden
signal must also be asserted to enable the read operation.
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Read Data from the EPCS/EPCQ/EPCQ-L Device
UG-ALT1005
2014.12.15
Altera Corporation
Altera ASMI Parallel IP Core User Guide