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What's One-Wait-State On-Chip ROM mean in TI?

D

Davy

Jan 1, 1970
0
Hello all,

I am reading TI's datasheet. And What's One-Wait-State On-Chip ROM
mean? Can it be reprogrammable like Flash?

Any suggestions will be appreciated!
Best regards,
Davy
 
J

James Beck

Jan 1, 1970
0
Hello all,

I am reading TI's datasheet. And What's One-Wait-State On-Chip ROM
mean? Can it be reprogrammable like Flash?

Any suggestions will be appreciated!
Best regards,
Davy
From that little bit of information I couldn't tell you.
One Wait State ROM means the CPU/CORE has to wait one bus cycle when
accessing the ROM because it (the ROM) is slower than the CPU is. ROM
is a pretty generic term these days and if it is REALLY ROM then once it
is programmed/masked it is over. Now EEPROM, EPROM, FLASH can be erased
and used again. I'm sure the datasheet has all of the information you
need. You just need to read it completely.

Jim
 
T

Tim Wescott

Jan 1, 1970
0
Davy said:
Hello all,

I am reading TI's datasheet. And What's One-Wait-State On-Chip ROM
mean? Can it be reprogrammable like Flash?

Any suggestions will be appreciated!
Best regards,
Davy
Telling us which of the gazzilion TI processors you're talking about
would be helpful. Usually if they mean flash they say "flash", though.
 
J

Jerry Avins

Jan 1, 1970
0
Davy said:
Hello all,

I am reading TI's datasheet. And What's One-Wait-State On-Chip ROM
mean? Can it be reprogrammable like Flash?

Some memories are faster than others. When the memory is slower than the
processor's cycle time, the processor must wait one or more clock cycles
for data from it after the address has been asserted. Each such cycle is
called a wait state.

ROM = read-only memory. Read-only means no writes.

Jerry
 
D

Davy

Jan 1, 1970
0
Hi all,

Thank you for your help :)

I mean the 320VC55x series(320VC5509).
Can I program the ROM or let TI do that? And if TI do that, how about
the cost?

Any suggestions will be appreciated!

Best regards,
Davy
 
J

Jasen Betts

Jan 1, 1970
0
["Followup-To:" header set to sci.electronics.basics.]
Hello all,

I am reading TI's datasheet. And What's One-Wait-State On-Chip ROM
mean? Can it be reprogrammable like Flash?

one wait state means it's half as fast as the cpu, if it was user
programmable they'd probably call it PROM,EPROM,FLASH or EEPROM.

Bye.
Jasen
 
K

Keith Williams

Jan 1, 1970
0
["Followup-To:" header set to sci.electronics.basics.]
Hello all,

I am reading TI's datasheet. And What's One-Wait-State On-Chip ROM
mean? Can it be reprogrammable like Flash?

one wait state means it's half as fast as the cpu,

No, as Jerry Avins said, it means that there is an extra cycle (wait state)
between the address and read portion of the access cycle.
 
D

Davy

Jan 1, 1970
0
Hi Jasen,

Thank you :)

I have one more question. If I have no on-chip Flash on TI's DSP, how
to protect my code? For everyone can copy my code from Flash and
produce another product?

All the best,
Davy
 
J

Jasen Betts

Jan 1, 1970
0
Hi Jasen,

Thank you :)

I have one more question. If I have no on-chip Flash on TI's DSP, how
to protect my code? For everyone can copy my code from Flash and
produce another product?

yes they can.

one option is to set the circuit in resin to make it hard to access the flash
another is to use a DSP with built in read-protectable PROM etc. if you
intend to produce large quuantities (eg ten thousand) TI can make them
already programmed (so called mask ROM)

Bye.
Jasen
 
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