SCPA033
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.
Socket A
Socket B
Vcc/Vpp |
|
|
TPS2226A |
|
|
Power |
|
|
Switch |
|
|
4 |
|
|
3 |
|
|
P2C Bus |
|
|
PCI1520 |
| Bus |
CardBus |
| |
| PCI | |
Controller |
| |
| PME# |
|
2 |
|
|
I2C Bus | IRQSER | Interrupt |
|
| Controller |
Serial
EEPROM (Optional)
CardBus Controller Block 
System Side
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
PCI1520 Implementation Guide | 3 |