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Bitfields for AMD-640 DRAM Timing register

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Bit Description

7 - 6

 RAS# precharge time
00 = 2T (for 50ns DRAM) [T = HCLK period]
01 = 3T (60ns)
10 = 4T (70ns)
11 = 6T

5 - 4

 RAS# pulse width
00 = 3T (for 50ns DRAM)
01 = 4T (60ns)
10 = 5T (70ns)
11 = 6T

3 - 2

 CAS# pulse width
FPM :
00 = 1T
01 = 2T
10 = 3T
11 = 4T
EDO :
00 = 1T
01 = 2T
10 = 3T
11 = 4T

1

 write pulse width:
0 = 1T
1 = 2T

0

 delay from column address to CAS#:
0 = 1T
1 = 2T

See Also:

#00983,#00994