Motorola MVME2400 - 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