2 Electronics
2.1 Processor
Processor support is for a dual voltage-plane socket 7, for the P54C, P55C and K6. Processor
bus speeds allowed are 60 or 66MHz, and all core multipliers can be set from the main jumper
block PL10. Depending on the processor fitted, the processor bus speed, core multiplier, and
core voltage will have to be correctly set.
2.2 Core
Logic
This is the Intel 430TX Pentium PCI chipset which comprises the MTXC North Bridge and
the PIIX4E South Bridge, both in BGA packages:
Board Build
Part
Step
Top Marking
Rev A to D
MTXC
A1
FW82439TX Q536ES (sample)
FW82439TX Q537ES (sample)
FW82439TX SL238 (prodn.)
Rev D
MTXC
A2
FW82439TX SL28T (prodn.)
Rev A to D
PIIX4
B0
FW82371AB Q534ES (sample)
FW82371AB Q535ES (sample)
FW82371AB SL23P (prodn.)
MTXC North Bridge features
64-bit processor host interface, Pentium family at 60MHz and 66MHz
64-bit DRAM controller, 4MB to 256MB main memory, EDO or SDRAM
L2 cache controller, 256KB or 512KB direct-mapped write-back, caches first 64MB main
memory, PBSRAM or DRAM cache
Synchronous 30MHz/33MHz 32-bit PCI 2.1 bus controller
Data path and buffers, three sets of data buffers
Power management features
PIIX4E South Bridge features
PCI 2.1 interface at 30 & 33MHz
ISA bus controller
Extensive power management features including ACPI compliance
IDE controller, two ports four drives, PIO mode 4 and Ultra 33 synchronous DMA mode
Enhanced DMA controllers, with distributed DMA support
Interrupt controllers, with serial interrupt support
System timers
Dual USB 1.0 port controller, 1.5/12 Mbps
SMBus interface
MC146818A compatible real-time clock with 256 bytes of RAM
