Motorola MVME2400 Series Manuel de service Page 199

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Functional Description
http://www.mcg.mot.com/literature 3-13
3
Note The information in Table 3-4 applies to access timing when
configured for devices with an access time equal to 5 clock
periods.
Note The information in Table 3-5 applies to access timing when
configured for devices with an access time equal to 3 clock
periods.
PowerPC 60x Bus Interface
The SMC has a PowerPC slave interface only. It has no PowerPC master
interface. The slave interface is the mechanism for all accesses to
SDRAM, ROM/Flash, and the internal and external register sets.
Responding to Address Transfers
When the SMC detects an address transfer that it is to respond to, it asserts
AACK_ immediately if there is no uncompleted PowerPC 60x bus data
transfer in process. If there is one in process, then the SMC waits and
Table 3-5. PowerPC 60x 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)1313------1313
1-Beat Read (2 to 8
bytes)
3413------3413
1-Beat Write 2121------2121
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