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Samedisk • 檢視主題 - ZC29 系列的 Memory 速度
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ZC29 系列的 Memory 速度

文章發表於 : 週四 4月 12, 2007 6:59 am
eject
在使用 8M/4M FLASH的時候
在CPU端要配合CPU BUS的速度
市面上比較常見的有-150, -120, -70
少部份有-50 而且很貴

ZC29 系列採用的是 20ns的SRAM
加上保護電路的延遲
Address,CE,OE 為4.5ns
Data Bus 為4.5ns

再加上一些 PCB 和 CABLE 的 DELAY 算 3ns

所以讀取總延遲(Address,CE,OE to DATA valid)= 20 + (4.5+3)x2 = 35ns
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Re: ZC29 系列的 Memory 速度

文章發表於 : 週一 4月 30, 2007 11:28 pm
eject
感謝熱心朋友詢問
20 + (4.5+3)x2 = 35ns

其中 x2 是因為
HOST對ROM發ADDRESS要過排線和TTL保護
ROMTER收到ADDRESS和CE/OE後回DATA也要過TTL和排線才能回HOST

所以Emulator Memory的速度要加兩次
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