Assumptions; Clock Ratios And Operating Frequencies; Ppc60X Originated; Table 3-7. Clock Ratios And Operating Frequencies - Motorola MVME2400 Series Installation And Use Manual
Vme processor module
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Also See for MVME2400 Series:
- Programmer's reference manual (331 pages) ,
- Installation and user manual (20 pages)
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Assumptions
Certain assumptions have been made with regard to MVME2400
performance. Some things, which are assumed in making the previous
tables, include the following:
Clock Ratios and Operating Frequencies
Performance is based on the appropriate clock ratio and corresponding
operating frequency:
Table 3-7. Clock Ratios and Operating Frequencies
Ratio
5:2
3:2
3:1
2:1
1:1
PPC60x Originated
http://www.motorola.com/computer/literature
PPC60x
Clock
(MHz)
83
100
100
66
66
Count represents number of PPC60x bus clock cycles.
Assumes write posting FIFO is initially empty.
Does not include time taken to obtain grant for PPC60x bus. The
count starts on the same clock period that TS_ is asserted.
PPC60x bus is idle at the time of the start of the transaction. (that is,
no pipelining effects).
Cache aligned transfer, not critical word first.
PCI medium responder with no zero states.
One clock request/one clock grant PCI arbitration.
Write posting enabled.
SDRAM
PCI Clock
Speed
(MHz)
(ns)
33
8
66
8
33
8
33
10
66
10
Block Diagram
3
3-11
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