Rainbow Electronics AT75C220 - Manual (Page 20)

AT75C220
20
• NWS: Number of Wait States
This field is valid only if WSE is set.
• WSE: Wait State Enable
• MWS: Multiply Wait States
See Table 9, where
• PAGES: Page Size
• TDF: Data Float Output Time
• BAT: Byte Access Mode
0 = Byte Write Mode
1 = Byte Select Mode
Table 9. NWS, WSE Values
NWS WSE Wait States
X X X 0 0
0 0 0 1 1
0 0 1 1 2
0 1 0 1 3
0 1 1 1 4
1 0 0 1 5
1 0 1 1 6
1 1 0 1 7
1 1 1 1 8
PAGES Page Size
Base
Address
0 0 1M byte BA[31 - 20]
0 1 4M bytes BA[31 - 22]
1 0 16M bytes BA[31 - 24]
1 1 Reserved –
TDF Cycles after Transfer
0 0 0 0
0 0 1 1
0 1 0 2
0 1 1 3
1 0 0 4
1 0 1 5
1 1 0 6
1 1 1 7
WS NWS 1 +
( ) 8 1
+
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