MarkEagle
VisorCentral Staff

Registered: Dec 1999
Location: Connecticut USA
Posts: 2682 |
quote: Originally posted by Toby
I thought it was 32MB?
I believe in total, this is true. The memory is mapped into two "slots" - csSlot0 and csSlot1. The Springboard Developement Guide says that only one of the Chip Select signals used to access the memory can be active at any one time, limiting it to a max of 16mb.
quote: Chip Select CS0*, CS1*
These two active-low chip select signals control access to the two addressable regions on the module. The address space for CS0* is referred to as csSlot0; the address space for CS1* is referred to as csSlot1. In order for the Palm OS to recognize the module and its contents, use CS0* to access ROM or Flash. CS1* is optional and can be used to interface with additional ROM, Flash, UARTs, or other peripheral devices. Both chip select signals are asserted for the duration of the memory cycle. Only one of the two chip selects is valid for each module access. The address bus is guaranteed to be valid before and during the assertion of the chip select signal. Refer to Section 2.1, �Memory Space,� for more information on the chip selects and their corresponding address spaces.
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