Motorola MVME2400 Series - Table 3-10. PPC Bus to Rom;Flash Access Timing (80 Ns @ 100 Mhz); Table 3-11. PPC Bus to Rom;Flash Access Timing (50 Ns @ 100 Mhz)

3-18 Computer Group Literature Center Web Site
Functional Description
3
Note The information in Table 3-10 is appropriate when configured
with devices with an access time equal to 8 CLK periods.
Note The information in Table 3-11 is appropriate when configured
with devices with an access time equal to 5 CLK periods.
Table 3-10. PPC Bus to ROM/Flash Access Timing (80ns @ 100 MHz)
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 54 18 48 12 48 12 48 12 198 54
4-Beat Write N/A N/A
1-Beat Read (1 byte) 1818------1818
1-Beat Read (2 to 8 bytes)5418------5418
1-Beat Write 2121------2121
Table 3-11. 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) 1515------1515
1-Beat Read (2 to 8 bytes)4215------4215
1-Beat Write 2121------2121