HP 744 Owner's Manual page 63

Typical Installation in a VME Card Cage
Configuring the VME Card Cage
2 To determine the maximum current usage of the Model 744 memory
cards, either use Figure 3-1 and Table 3-2 (for Model 744/132L) or Table
3-3 (for Model 744/165L). You must work with the worst case power
draw to correctly determine power usage. Determine worst case power
draw by examining active memory bank configurations, using the follow-
ing steps:
a Examine your memory card configuration, noting which size card is in
b The worst case active memory bank configuration depends on the slot
c Inactive memory banks are those banks on cards in your configuration
d Fill in the information in Table 3-2 or Table 3-3.
3-4
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each memory slot.
position of the memory cards, and the size of the cards. The 32 MB
memory card has two banks per card, and the 16, 64, and 128 and 256
MB cards each have only one memory bank per card.
• When 32 MB cards are used as a pair in memory slots 2 and 3 they
can use three memory banks concurrently.
• When used as a pair in slots 0, 1, or 2, the 32 MB cards can have
two active memory banks.
• The 16, 64, 128 and 256 MB cards each have only one memory
bank that is active at any one time.
The worst case power draw is when your system has two 32MB cards
in slots 2 and 3 (these banks would be considered active, all other
memory cards/banks would be considered inactive). The next worst
case is a 256 MB card in any slot (all other memory cards in the sys-
tem would be inactive), followed by a 64 MB card in any slot (all
other memory cards in the system would be inactive), followed by
two 32 MB cards in slots 0, 1, or 2 (all other memory cards in the sys-
tem would be inactive), followed by a 128 MB card in any slot, and
finally a 16 MB card in any slot (all other memory cards in the system
would be inactive).
in addition to the worst case active memory banks, and must also be
added to the calculation.