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Advanced/ZP Technical Product Summary • Page 6
SYSTEM MEMORY
The Advanced/ZP baseboard provides four 72-pin SIMM sites for memory expansion. The sockets support 1M x 32 (4 MB),
2M x 32 (8 MB), 4M x 32 (16 MB), and 8M x 32 (32 MB) single-sided or double-sided SIMM modules. Minimum memory
size is 8 MB and maximum memory size, using four 8M x 32 SIMM modules, is 128 MB. For external CPU speeds of less
than 60 Mhz (used with 75, 90 and 120 Mhz processors) memory timing requires 70 ns fast page devices or, for higher
performance, 70 ns EDO DRAM. For external CPU speeds of 66 Mhz (used with 100 Mhz processors) you must use 60 nS
EDO DRAM, but 70 nS fast page DRAM may still be used. Parity generation and checking is not supported by the chip set.
The four sockets are arranged as Bank 0 and Bank 1, with each bank consisting of two sockets and providing a 64-bit wide
data path. Both SIMMs in a bank must be of the same memory size and type, however Banks 0 and 1 may have different
types of memory installed. It is even possible to have 70 ns Fast Page DRAM in one bank and 60 ns EDO DRAM in the
other, in which case each bank is independently optimized for maximum performance. Bank 0 only, Bank 1 only, or both
banks may be populated. There are no jumper settings required for the memory size or type, which is automatically detected
by the system BIOS. Tin lead SIMMs are required to be used when adding Fast Page or EDO DRAM.
EDO DRAM
Extended Data Out (or Hyper Page Mode) DRAM is designed to improve the DRAM read performance. EDO DRAM
holds the memory data valid until the next CAS# falling edge, unlike standard fast page mode DRAM which tri-states
the memory data when CAS# negates to precharge for the next cycle. With EDO, the CAS# precharge overlaps the data
valid time, allowing CAS# to negate earlier while still satisfying the memory data valid window time.
EXPANSION SLOTS
Up to six expansion slots may be populated on the Advanced/ZP baseboard. There are four ISA bus expansion conectors and
three PCI expansion connectors. One slot is shared by connectors that will accommodate either an ISA or a PCI expansion
card, but not both at the same time. This accounts for the disparity between the number of slots and connectors. All three
PCI expansion slots accept PCI bus mastering cards, and fully comply with the PCI 2.10 specification. Three of the ISA
slots and one PCI slot can accommodate full length add-in cards. Interference with the processor heat sink and CPU voltage
regulator support circuitry limits the rest of the ISA and PCI slots to being able to support only half-length add-in cards.
PCI 3.3 VOLT CAPABILITIES
To maintain strict compliance with the PCI specification, the baseboard provides a connector which can be used to route
3.3 volt power to the PCI slots. The connector may be used with a separate 3.3 volt power supply or with a custom
designed voltage converter. Note: The on-board 3.3 volt regulator provides power for the CPU, PCIset and L2 cache
only, not the PCI slots.