DS89C420-QCL Datasheet, PDF (68/139 Pages) Maxim Integrated Products – Ultra-High-Speed Flash Microcontroller User’s Guide

Ultra-High-Speed Flash
Microcontroller User’s Guide
Table 6-6. Page Mode 1—Data Memory Stretch Values Two Cycles (PAGES 1:0 = 01b)
MD2:MD0
(STRETCH VALUE)
STRETCH
CYCLES
RD/WR PULSE WIDTH (IN NUMBER OF OSCILLATOR CLOCKS)
4X/2X, CD1, CD0 = 100 4X/2X, CD1, CD0 = 000 4X/2X, CD1, CD0 = X10 4X/2X, CD1, CD0 = X11
000
0
0.25
0.5
001
1
0.75
1.5
010
2
1.75
3.5
011
3
2.75
5.5
100
7
3.75
7.5
101
8
4.75
9.5
110
9
5.75
11.5
111
10
6.75
13.5
1
1024
3
3072
7
7168
11
11264
15
15360
19
19456
23
23552
27
27648
Table 6-7. Page Mode 1—Data Memory Stretch Values Four Cycles (PAGES 1:0 = 10b)
MD2:MD0
(STRETCH VALUE)
000
001
010
011
100
101
110
111
STRETCH
CYCLES
0
1
2
3
7
8
9
10
RD/WR PULSE WIDTH (IN NUMBER OF OSCILLATOR CLOCKS)
4X/2X, CD1, CD0 = 100 4X/2X, CD1, CD0 = 000 4X/2X, CD1, CD0 = X10 4X/2X, CD1, CD0 = X11
0.5
1
2
2048
1
2
4
4096
2
4
8
8192
3
6
12
12288
4
8
16
16384
5
10
20
20480
6
12
24
24576
7
14
28
28672
Table 6-8. Page Mode 2—Data Memory Stretch Values (PAGES 1:0 = 11b)
MD2:MD0
(STRETCH VALUE)
000
001
010
011
100
101
110
111
STRETCH
CYCLES
0
1
2
3
7
8
9
10
RD/WR PULSE WIDTH (IN NUMBER OF OSCILLATOR CLOCKS)
4X/2X, CD1, CD0 = 100 4X/2X, CD1, CD0 = 000 4X/2X, CD1, CD0 = X10 4X/2X, CD1, CD0 = X11
0.5
1
2
2048
1
2
4
4096
2
4
8
8192
3
6
12
12288
4
8
16
16384
5
10
20
20480
6
12
24
24576
7
14
28
28672
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