Motorola MVME172 用户手册
4-6
Computer Group Literature Center Web Site
IP2 Chip
4
Notes
1. This column is a measure of IndustryPack bandwidth for
back to back cycles for a local bus master which is accessing
a memory or I/O space location on an IndustryPack. It
assumes a zero wait state acknowledge reply from the
IndustryPack.
back to back cycles for a local bus master which is accessing
a memory or I/O space location on an IndustryPack. It
assumes a zero wait state acknowledge reply from the
IndustryPack.
2. This column is a measure of IndustryPack bandwidth for
DMA burst cycles between a local bus slave and a memory
or I/O space location on an IndustryPack. It assumes a zero
wait state acknowledge reply from the IndustryPack.
DMA burst cycles between a local bus slave and a memory
or I/O space location on an IndustryPack. It assumes a zero
wait state acknowledge reply from the IndustryPack.
3. This column is a measure of IndustryPack bandwidth for
DMA single cycles between a local bus slave and a memory
or I/O space location on an IndustryPack. It assumes a zero
wait state acknowledge reply from the IndustryPack.
DMA single cycles between a local bus slave and a memory
or I/O space location on an IndustryPack. It assumes a zero
wait state acknowledge reply from the IndustryPack.
4. Burst mode sDMA is not supported when both bus
frequencies are 32 MHz.
frequencies are 32 MHz.
5. Because the specified band width assumes a zero wait state
IndustryPack cycle, it would be difficult to achieve the stated
bandwidths for an IP bus frequency of 32 MHz.
IndustryPack cycle, it would be difficult to achieve the stated
bandwidths for an IP bus frequency of 32 MHz.
Table 4-1. IP2 Chip Clock Cycles
Bus Frequency
Period and Bandwidth to 32-Bit IP Space
MC68060
IP
Back to Back
Examine
(Note 1)
Four Cycle
DMA Burst
(Note 2)
Single Cycle
DMA
(Note 3)
25 MHz
8 MHz
4 IP clocks
8 MB/sec
10 IP clocks
12.8 MB/sec
4 IP clocks
8 MB/sec
32 MHz
8 MHz
3 IP clocks
10.6 MB/sec
10 IP clocks
12.8 MB/sec
4 IP clocks
8 MB/sec
32 MHz
32 MHz
(Note 5)
(Note 5)
6 IP clocks
21 MB/sec
12 IP clocks
42 MB/sec
(Note 4)
6 IP clocks
21 MB/sec