Motorola MVME2400 manual Total, 1st Beat 2nd Beat 3rd Beat 4th Beat Clocks Bits

Functional Description

3

Table 3-10. PPC Bus to ROM/Flash Access Timing (120ns @ 100MHz)

		CLOCK PERIODS REQUIRED FOR:							Total
ACCESS TYPE	1st Beat		2nd Beat		3rd Beat		4th Beat		Clocks
	16	64	16	64	16	64	16	64	16	64
	Bits	Bits	Bits	Bits	Bits	Bits	Bits	Bits	Bits	Bits
4-Beat Read	70	22	64	16	64	16	64	16	262	70
4-Beat Write				N/A					N/A
1-Beat Read (1 byte)	22	22	-	-	-	-	-	-	22	22
1-Beat Read (2 to 8 bytes)	70	22	-	-	-	-	-	-	70	22
1-Beat Write	21	21	-	-	-	-	-	-	21	21

Note: The information in Table 3-10 is appropriate when configured with devices with an access time equal to 12 CLK periods.

Table 3-11. PPC Bus to ROM/Flash Access Timing (80ns @ 100MHz)

		CLOCK PERIODS REQUIRED FOR:							Total
ACCESS TYPE	1st Beat		2nd Beat		3rd Beat		4th Beat		Clocks
	16	64	16	64	16	64	16	64	16	64
	Bits	Bits	Bits	Bits	Bits	Bits	Bits	Bits	Bits	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)	18	18	-	-	-	-	-	-	18	18
1-Beat Read (2 to 8 bytes)	54	18	-	-	-	-	-	-	54	18
1-Beat Write	21	21	-	-	-	-	-	-	21	21

Note: The information in Table 3-11 is appropriate when configured with devices with an access time equal to 8 CLK periods.

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