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SCPA033
PCI1520 Implementation Guide 3
1 PCI1520 Typical System Implementation
The figure below represents a typical implementation of the PCI1520 PC Card Controller. The
device serves as a bridge between a PCI Bus and a PC Card interface. The PCI1520 will
operate only with the PCI Bus as a primary bus and the PC Card interface as the secondary
bus. The PC Card interface operates with both CardBus (32-bit) and 16-bit PC Cards.
Figure 1. Typical System Implementation
A power switch is necessary in order to control power to the PC Card sockets. The
recommended power switch is the TPS2226A. Other possibilities include the TPS2224A,
TPS2216A, and the TPS2206. The TPS2223A is also available but does not provide 12V Vpp.
The EEPROM can be used to set various configuration registers but is not necessary if those
registers are settable via software/BIOS for the system.
IRQSER is used to pass both PCI interrupts and ISA style legacy interrupts to the system. Only
PCI interrupts are necessary in order for CardBus cards to operate correctly. Some 16-bit PC
Cards require ISA style legacy interrupts in order to function properly.
Serial
EEPROM
P2C Bus
4
TPS2226A
Power
Switch
PCI1520
CardBus
Controller
Vcc/Vpp
Socket A
3
Interrupt
Controller
Socket B
(Optional)
PCI Bus
2
CardBus Controller Block System Side
PME#
I2C Bus IRQSER