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Motherboard Description
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1.12.2 Memory/Expansion Connectors
The AP440FX motherboard has four 72-pin SIMM sockets for main memory. These sockets
accept standard SIMM 72-pin modules, as long as they satisfy the requirements described in the
“Main System Memory” section of this specification, starting on page 12.
The AP440FX motherboard uses a PCI/ISA riser connector (J6J2) to provide for expansion PCI or
ISA boards. The associated riser board can support either two or three PCI slots. A pair of
jumpers on the AP440FX motherboard must be set to define the number of PCI slots on the riser
board. Refer to Figure 8 on page 35 for jumper block details. Table 7 shows the pinout listing for
the PCI/ISA riser connector.
Table 7. PCI/ISA Riser Connector (J6J2)
Pin Signal Name Pin Signal Name Pin Signal Pin Signal Name
A1 IOCHK# B1 GND E1 GND F1 GND
A2 SD7 B2 RSTDRV E2 GND F2 GND
A3 SD6 B3 Vcc E3 PCIINT1# F3 PCIINT3#
A4 SD5 B4 IRQ9 E4 PCIIINT2# F4 PCIINT4#
A5 SD4 B5 -5 V E5 Vcc F5 Vcc
A6 SD3 B6 DRQ2 E6 Key F6 Key
A7 SD2 B7 -12 V E7 Vcc F7 Vcc
A8 SD1 B8 0WS# E8 PCIRST# F8 PCKLF
A9 SD0 B9 +12 V E9 GNT0# F9 GND
A10 IOCHRDY B10 GND E10 REQ0# F10 GNT1#
A11 AEN B11 SMEMW# E11 GND F11 GND
A12 SA19 B12 SMEMR# E12 PCKLE F12 REQ1#
A13 SA18 B13 IOW# E13 GND F13 AD31
A14 SA17 B14 IOR# E14 AD30 F14 AD29
A15 SA16 B15 DACK3# E15 3.3 V F15 3.3 V
A16 SA15 B16 DRQ3 E16 Key F16 Key
A17 SA14 B17 DACK1# E17 3.3 V F17 3.3 V
A18 SA13 B18 DRQ1 E18 AD28 F18 AD27
continued
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