CD32 FMV module - is there any RAM onboard?

skan · 13 February 2024, 22:17

According to C-Cube CL450 datasheet, it could handle 512KB / 1MB RAM, so I'm just curious... Is there any on the FMV module or is it a straight CD-to-decoder-to-DAC solution?

Matt_H · 13 February 2024, 22:27

It adds no RAM to the system; not sure if it uses onboard RAM for processing. It does use 4MB of Zorro II address space, though.

skan · 13 February 2024, 22:29

Quote:

Originally Posted by Matt_H

It adds no RAM to the system; not sure if it uses onboard RAM for processing. It does use 4MB of Zorro II address space, though.

Yeah I knew it adds no RAM, but upon a closer inspection of the board it seems no memory at all on there...

Rochabian · 13 February 2024, 23:03

U201 isn't a memory chip ? Seems to be a Texas Instrument 80ns memory chip from pics (mine has a NEC 80ns memory chip )
From the schemes it says 256k x16

skan · 13 February 2024, 23:11

Quote:

Originally Posted by Rochabian

U201 isn't a memory chip ? Seems to be a Texas Instrument 80ns memory chip
From the schemes it says 256k x16

Oh nice, thx! So it seems there's 512KB of RAM there, the minimum a CL450 can address.

derSammler · 14 February 2024, 08:44

All MPEG decoders have on-board memory. You can't decode an MPEG stream without it.

Too bad the memory is not added to the system when the decoder is not in use. On the CD-i for example, they managed to do exactly that.

nogginthenog · 14 February 2024, 10:16

Quote:

Originally Posted by derSammler

Too bad the memory is not added to the system when the decoder is not in use. On the CD-i for example, they managed to do exactly that.

If it's accessable by the processor it can be manually added with a call to AddMemList().
I see there's a tool (AddMem) on Aminet for this.

13 February 2024, 22:17	#1
skan Dream Merchant Join Date: Sep 2007 Location: Dreamlands Posts: 530	CD32 FMV module - is there any RAM onboard? According to C-Cube CL450 datasheet, it could handle 512KB / 1MB RAM, so I'm just curious... Is there any on the FMV module or is it a straight CD-to-decoder-to-DAC solution?

13 February 2024, 23:03	#4
Rochabian The Big White Cat Join Date: Jan 2005 Location: France Age: 44 Posts: 828	U201 isn't a memory chip ? Seems to be a Texas Instrument 80ns memory chip from pics (mine has a NEC 80ns memory chip ) From the schemes it says 256k x16 Last edited by Rochabian; 13 February 2024 at 23:12.

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13 February 2024, 22:27	#2
Matt_H Registered User Join Date: Jul 2008 Location: Boston, MA Posts: 945	It adds no RAM to the system; not sure if it uses onboard RAM for processing. It does use 4MB of Zorro II address space, though.

14 February 2024, 08:44	#6
derSammler Senior Member Join Date: Jun 2001 Location: Germany Posts: 1,648	All MPEG decoders have on-board memory. You can't decode an MPEG stream without it. Too bad the memory is not added to the system when the decoder is not in use. On the CD-i for example, they managed to do exactly that.

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