Altera RAM Initializer - Manual (Page 35)

Altera Corporation Confidential—Internal Use Only 3–3
May 2008 RAM Initializer (ALTMEM_INIT) Megafunction User Guide
Specifications
Table 3–2 lists the output ports of the ALTMEM_INIT megafunction.
Table 3–3 lists the parameters for the ALTMEM_INIT megafunction.
Table 3–2. ALTMEM_INIT Megafunction Output Ports
Port Name Required Description Comments
dataout[] Yes Data sent to external RAM. Output port [(width–1)..0] wide. The
value of the
dataout port
corresponds to the data at the
address specified by the
ram_address port.
init_busy Yes Indicates that the RAM initialization
from ROM is in progress. The init_busy signal remains
active throughout the initialization
process, and returns to an inactive
state when initialization is complete.
ram_wren Yes Write-enable signal to RAM. When asserted, the data that is sent
from the
dataout port is valid.
ram_address[] Yes RAM address. —
rom_address[] No ROM address that connects to the
external ROM. This port is applicable in the
external-ROM mode only. When this
port is in use, connect it to the
address input port of the external
ROM.
rom_rden No Read-enable signal that connects to
the external ROM. This port is applicable in the
external-ROM mode only. When
asserted, the ALTMEM_INIT
megafunction generates valid values
for the
rom_address port.
Table 3–3. ALTMEM_INIT Megafunction Parameters (Part 1 of 2)
Parameter Name Type Required Description
INIT_FILE String No Specifies the name of the initialization file. If the
INIT_FILE parameter is specified, the
INIT_TO_ZERO parameter value is overridden and
initialization from internal ROM is performed. If the
INIT_FILE and INIT_TO_ZERO parameter values are
not specified, initialization from an external ROM address
is performed. You must connect the appropriate ports
when initialization is from an external ROM address.
INIT_TO_ZERO String No Specifies whether the RAM must be initialized to contain
all 0’s. The INIT_FILE parameter value takes precedence
over the INIT_TO_ZERO parameter value. Values are
YES and NO . If omitted, the default is NO .