WRT54GS v1 DRAM upgrade 2x 16MB (32MB) -- to 2x (32) 64MB

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voip2014
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Joined: 20 Feb 2021
Posts: 38

PostPosted: Tue Mar 23, 2021 12:06    Post subject: WRT54GS v1 DRAM upgrade 2x 16MB (32MB) -- to 2x (32) 64MB Reply with quote
Anyone tried upgrading the the two 16MB tsop 54 (32MB) chips to two 32MB chips to get 64MB

chips looks like this candidate should work

original 16MB chip:
IC42S16800-7T
FEATURES
• Single 3.3V (± 0.3V) power supply
• High speed clock cycle time -6: 166MHz<3-3-3>,
-7H: 133MHz<2-2-2>, -7: 133MHz<3-3-3>, -8:
100MHz<2-2-2>
• Fully synchronous operation referenced to clock
rising edge
• Possible to assert random column access in
every cycle
• Quad internal banks contorlled by BA0 & BA1
(Bank Select)
• Byte control by LDQM and UDQM for
IC42S16800
• Programmable Wrap sequence (Sequential /
Interleave)
• Programmable burst length (1, 2, 4, 8 and full
page)
• Programmable CAS latency (2 and 3)

I was considering
1 x IS42S16160D-7TL IS42S16160D TSOP54 256-MBIT SYNCHRONOUS DRAM

But other options below:


IS42S16160D-75ETLI Integrated Silicon Solution Dram chip sdram 256m-bit 16mx16 3.3v 54-pin tsop-ii 5.5 133 16 0.256 SDRAM 3.3 3.3 -40 85 TSOP-II-54 Tray
IS42S16160D-75ETLI-TR Integrated Silicon Solution Dram chip sdram 256m-bit 16mx16 3.3v 54-pin tsop-ii t/r 5.5 133 16 0.256 SDRAM 3.3 3.3 -40 85 TSOP-II-54 Tape & Reel
IS42S83200D-75ETLI Integrated Silicon Solution Dram chip sdram 256m-bit 32mx8 3.3v 54-pin tsop-ii 5.5 133 8 0.256 SDRAM 3.3 3.3 -40 85 TSOP-II-54 Tray
IS45S16160D-75ETLA1 Integrated Silicon Solution Dram chip sdram 256m-bit 16mx16 3.3v 54-pin tsop-ii 5.5 133 16 0.256 SDRAM 3.3 3.3 -40 85 TSOP-II-54 Tray

Anyone tried any of these?


Last edited by voip2014 on Fri Apr 30, 2021 7:36; edited 1 time in total
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voip2014
DD-WRT Novice


Joined: 20 Feb 2021
Posts: 38

PostPosted: Fri Apr 30, 2021 7:35    Post subject: Reply with quote
for 64MB you need the IC42S16160 chip(s) the IS series DO NOT WORK!, tried, Will give it a go when the new chips arrive
voip2014
DD-WRT Novice


Joined: 20 Feb 2021
Posts: 38

PostPosted: Wed May 12, 2021 4:15    Post subject: Reply with quote
So...... no new chips work to go to 64MB

only the old IC logo with IC42S16160 from 2003 or IC42S16800 can work.

After trying a number of chips I ended up having to reorder more chips above its probably something to do with compatibility the new board(s) wrt54g(s)v2-8 are not so fussy the v1 is.

worst case I can revert it to 32MB. waiting for new chips to show up.
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