MSM60808

The MSM60808 is a bridge chip to interface a PCI bus and a two-socket PC Card bus. The PCI bus interface is based on the PCI 2.1 standard. The PC Card interface works with 16-bit cards and 32-bit CardBus cards based on the PCMCIA 2.1/JEIDA 4.2 standard. This new PC Card of MSM60808 standard enables high-speed data transfer at a maximum clock frequency of 33 MHz, with a data width of 8 bits or 16 bits for 16-bit PC Cards and a data width of 32 bits for CardBus PC Cards.

When a PC Card is inserted in a socket, the MSM60808 automatically detects the card type and the power supply voltage requested by the card. After it detects card type and power supply voltage,the MSM60808 automatically switches to 16-bit PC Card mode or CardBus PC Card mode depending on the type of card inserted. In 16-bit PC Card mode, the MSM60808 operates as a target device on the PCI bus, and in CardBus PC Card mode, the MSM60808 operates as a PCI-to-PCI bridge. After this, software will configure the MSM60808's internal control registers, and data transfer from the PCI bus to the card can begin.

After the card's power supply voltage has been confirmed, the MSM60808 performs serial data access to the TPS2202AI voltage control chip and applies voltage to the card using the TPS2202AI.When the card is removed, the MSM60808 automatically stops applying voltage to the socket.After a card is inserted, it will have numerous status changes and request service routines, which will generate various interrupts. These interrupts can be made on the ISA bus IREQ signal or the PCI bus INT# signal.