Altera Active Serial Memory Interface User Manual
Page 7
Parameter
Legal Values
Descriptions
Write mode
—
• This option is only available when you turn on the
Enable ‘write’ operation option.
• When you select this option, the Altera ASMI Parallel
IP core defines two parameters, which are PAGE_SIZE
and PORT_SHIFT_BYTES for the following writing
mode to the EPCS/EPCQ/EPCQ-L device:
Single byte write: PAGE_SIZE = 1, PORT_SHIFT_
BYTES = PORT_UNUSED
Page write: PAGE_SIZE = 1 to 256, if 1 then PORT_
SHIFT_BYTES = PORT_UNUSED, else PORT_USED
Store ‘page write’ data in logic elements.
Use ‘fast_read’ port
—
• Enables the ability to perform a fast read operation
with an active-high input signal named
fast_read
.
When this signal is asserted, the IP core performs a fast
read from the memory address that appears on the
addr[23..0]
signal. Each data byte appears on the
dataout[7..0]
signal as it is read. For EPCQ256/
EPCQ-L256 or larger devices, the width of the
addr
and
read_address
signals is 32 bit.
• The
fast_read
signal supports single-byte fast read
and sequential fast read. If a write or erase operation is
in progress (the busy signal is asserted), the fast read
command is ignored. The fast read operation occurs
only when allowed by the
rden
signal.
• This option is available for all EPCS/EPCQ/EPCQ-L
devices, except for EPCS1 and EPCS4 devices.The fast
read operation replaces the normal settings.
UG-ALT1005
2014.12.15
Parameters
7
Altera ASMI Parallel IP Core User Guide
Altera Corporation