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Re: [N8VEM-S100:275] Request For Comments (NIC Board)



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Yeah, I like the idea of having actual dual ported RAM on the slave
board rather than the bus arbitration, it both simplifies things, and
does not hang up the Z80 when the master is accessing.

Yup....starting to really like it.

- --Mike

On 11-06-09 06:47 AM, Douglas Goodall wrote:
> 0000-07FF 2716 2Kx8 EPROM with Z80 startup code
> 	This code would identify SPI devices on board and post their 
> 	IDs in the dual ported ram. Also it can provide transfer services 
> 	to load local SPI drivers into the non-volatile ram (8K/SPI device)
> 
> 2000-5FFF Static ram (16k) (OPTIONAL)
> 	Used as local storage for on-board drivers
> 
> 6000-7FFF Dual Ported RAM for Master access (8K)
> 	Conveniently sized to access one ethernet miniboard's internal
> 	dual-ported ram.
> 
> 
> 
> 
> 
> 8000-FFFF Non-volatile RAM (Dallas...) (32K=8K/SPI device)

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