Altera Active Serial Memory Interface - Manual (Page 17)

Port Condition Size Descriptions
epcs_id[]
Optional 8 bit Contains the silicon ID of the EPCS device after the read
silicon ID operation. This port holds the value of the silicon
ID until the device resets. Sample the
epcs_id[7..0]
port
after the
busy
signal goes low.
illegal_erase
Optional 1 bit Indicates that an erase instruction has been set to a
protected sector on the EPCS/EPCQ/EPCQ-L memory. This
port is required when you specify the
sector_erase
port,
bulk_erase
port, or
die_erase
port. The
illegal_erase
signal goes high to indicate that the IP core has cancelled the
erase instruction. The signal pulses high for two clock cycles
—one clock cycle before, and one clock cycle after the
busy
signal goes low. Monitor this port to detect the status of an
erase operation.
illegal_write
Optional 1 bit Indicates that a write instruction is targeting a protected
sector on the EPCS/EPCQ/EPCQ-L memory. This port is
required when you specify the write port. The
illegal_
write
signal goes high to indicate that the IP core has
cancelled a write instruction. The signal pulses high for two
clock cycles—one clock cycle before, and one clock cycle
after the
busy
signal goes low. Monitor this port to detect
the status of a write operation.
rdid_out[]
Optional 8 bit Contains the memory capacity ID of the EPCS/EPCQ/
EPCQ-L device after the read memory capacity ID
operation is completed. This port holds the value until the
device resets. Sample the
rdid_out[7..0]
port after the
busy
signal goes low.
read_address[]
Optional 24 or
32 bit
Contains the memory address of the EPCS/EPCQ/EPCQ-L
to be read from. Use this port together with the
dataout[7..0]
port.
For EPCQ256/EPCQ-L256 or larger devices, the width of
the
addr
and
read_address
signals is 32 bit.
status_out[]
Optional 8 bit Contains the value of the EPCS/EPCQ/EPCQ-L status
register after the read status register operation is completed.
This port holds the value until you execute another reading
status register operation, or until you reset the device. To
obtain the most recent value of the status register, you must
perform a read status register operation before sampling the
status_out[7..0]
port. Sample the port only after the
busy
signal goes low.
Related Information
• on page 26
For more information about the write operation
• on page 23
For more information about the read operation
• on page 20
For more information about the read silicon ID operation
UG-ALT1005
2014.12.15
Output Ports 17
Altera ASMI Parallel IP Core User Guide Altera Corporation
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