The LH75401-10 card engine can support up to 2MB SRAM (stock is 512 KB). Changes in Hardware and Software must be made to account for this.
Hardware:
If you add additional SRAM to the card engine please refer to the LH75401-10 card engine schematics (pg. 4) for memory location and jumper setting changes.
For Example, if you want to upgrade to 2MB:
1. Populate U5, U6, U20, U21 with 512 KB SRAM, (Part number
IDT71V416SA15PH)
2. change JP1 and JP2 jumper settings to both '+', (as shown in 'SRAM
DENSITY CONFIGURATION BITS ' Table on pg. 4 of schematics)
Software:
The Bolo/Lolo that shipped with the LH75401-10 Card engine is designed to support 512KB SRAM. It will not support the additional SRAM.
Configure your software to account for the additional SRAM.
Regards,
Andrew Wawra
Logic Product Development
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