Table 3-4. Powerpc 60X Bus To Rom/Flash Access Timing When; Table 3-5. Powerpc 60X Bus To Rom/Flash Access Timing When Configured For 8-Bit Devices; Rom/Flash Speeds - Motorola MVME2600 Series Reference Manual

ROM/Flash Speeds

The Falcon pair provides the interface for two blocks of ROM/Flash. Each
block can address up to 64Mbytes of memory depending on the type of the
devices implemented for that block (8-bit, 32-bit, or 64-bit devices). The
access times for ROM/Flash are shown in Tables 3-4 and 3-5.
Table 3-4. PowerPC 60x Bus to ROM/Flash Access Timing When Configured
ACCESS TYPE
4-Beat Read
4-Beat Write
1-Beat Read
1-Beat Write
Table 3-5. PowerPC 60x Bus to ROM/Flash Access Timing When Configured
ACCESS TYPE
4-Beat Read
4-Beat Write
1-Beat Read (2 bytes to 8 bytes)
1-Beat Read (1 byte)
1-Beat Write
for 32/64-bit Devices
CLOCK PERIODS REQUIRED FOR:
1st 2nd
Beat Beat
20 16
N/A N/A
20 -
19 -
for 8-bit Devices
CLOCK PERIODS REQUIRED FOR:
1st 2nd
Beat Beat
68 64
N/A N/A
68 -
20 -
19 -
Functional Description
Total
3rd 4th
Clocks
Beat Beat
16 16
N/A N/A N/A
- -
- -
Total
3rd 4th
Clocks
Beat Beat
64 64 260
N/A N/A N/A
- -
- -
- -
3
68
20
19
68
20
19
3-11