Achronix Speedster22i User Macro Guide Manuale Utente Scaricare il pdf (Pagina 175)

Memories LRAM640

Speedster22i Macro Cell Library

AchronixSemiconductorProprietary PAGE 158

write_clock_polarity

Thewrite_clock_polarityparameterisusedtosettheactiveedgeofthewrclkclock.Avalueof

“rise”corresponds toan activerising edgeassignmentwhile“fall”corresponds toanactive

fallingedgeassignment.Thedefaultvalueofthew rite_cl ock_polarityparameteris“rise”.

read_clock_polarity

Theread_clock_polarityparameterisusedtosettheactiveedgeoftherdclkclock.Avalueof

“rise”corresponds toan activerising edgeassignmentwhile“fall”corresponds toanactive

fallingedgeassignment.Thedefaultvalueoftheread_clock_polarityparamteris“rise”.

reg_dout

Thereg_doutparameterdefinesiftheReadPortOutputRegisterisusedorbypassed.Setting

reg_dout to 1’b0 bypasses the register while setting reg_dout to 1’b1 enables the register.

Enablingtheoutputregisterincurrsanadditionalcycleoflatencyforthereadoperation.The

reg_doutparameterdefaultstothevalue1’b0.

reg_initval

The reg_initval parameter defines the power‐up default value of the Read Port Output

reg_rstval

Thereg_rstvalparameter definesthe value assignedtotheRead PortOutputRegister when

therstregninputisassertedlowandthereisactiveedgeoftherdclk.Thereg_rstvalparameter

defaultstothevalue10’h0.

regce_priority

Theregce_priorityparameterdefinesthepriorityoftheoutregceclockenableinputrelativeto

therstregnresetinputduringanassertionoftherstregnresetinputontheReadPortOutput

atthenextactiveedgeof

rdclkwithoutrequiringtheoutregceclockenableinputtobeactive.

Settingregce_priorityto“regce”requiresthattheregceclockenableinputishighforthereset

operationtooccuratthe nextactiveedgeof  rdclk.Thedefaultvalueoftheregce_priority_a

parameteris“rstreg”.

mem_init

The mem_init parameter defines the initial contents of the  memory. The 640‐bit parameter

associated with the LRAM640 memory as defined in the

LRAM640 Memory Initialization

section.

mem_init_file

Themem_init_fileparameterprovidesamechanismtosettheinitialcontentsoftheLRAM640

memory. If the mem_init_value is define d, the LRAM640 will be initialized with the values

definedinthefilepointedtobythemem_init_fileparameteraccordingtotheformatdefined

inthe

LRAM640MemoryInitializationsection.Ifthemem_init_fileisleftatthedefaultvalue

of “”, the initial contents will be defined by the value of the mem_init parameter. If the

memory initialization parameter and the mem_init_file parameters are not defined, the

contentsoftheLRAM640willbeundefined.

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