Motorola MVME2400 User Manual
Page 69
Block Diagram
http://www.mcg.mot.com/literature
3-21
3
Note: The information in Table 3-12 is appropriate when configured with
devices with an access time equal to 5 CLK periods.
Note: The information in Table 3-13 is appropriate when configured with
devices with an access time equal to 3 CLK periods.
Table 3-12. PPC Bus to ROM/Flash Access Timing (50ns @ 100MHz)
ACCESS TYPE
CLOCK PERIODS REQUIRED FOR:
Total
Clocks
1st Beat
2nd Beat
3rd Beat
4th Beat
16
Bits
64
Bits
16
Bits
64
Bits
16
Bits
64
Bits
16
Bits
64
Bits
16
Bits
64
Bits
4-Beat Read
42
15
36
9
36
9
36
9
150
42
4-Beat Write
N/A
N/A
1-Beat Read (1 byte)
15
15
-
-
-
-
-
-
15
15
1-Beat Read (2 to 8 bytes)
42
15
-
-
-
-
-
-
42
15
1-Beat Write
21
21
-
-
-
-
-
-
21
21
Table 3-13. PPC Bus to ROM/Flash Access Timing (30ns @ 100MHz)
ACCESS TYPE
CLOCK PERIODS REQUIRED FOR:
Total
Clocks
1st Beat
2nd Beat
3rd Beat
4th Beat
16
Bits
64
Bits
16
Bits
64
Bits
16
Bits
64
Bits
16
Bits
64
Bits
16
Bits
64
Bits
4-Beat Read
34
13
28
7
28
7
28
7
118
34
4-Beat Write
N/A
N/A
1-Beat Read (1 byte)
13
13
-
-
-
-
-
-
13
13
1-Beat Read (2 to 8 bytes)
34
13
-
-
-
-
-
-
34
13
1-Beat Write
21
21
-
-
-
-
-
-
21
21