Ricoh R5C841 Manual Do Utilizador

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The R5C841 supports PCI-CardBus Bridge Interface functions for the PC Card socket, the 

PCI-IEEE1394 bridge function, the SD Card interface, the Memory Stick interface and the xD 

Picture Card interface. Logically the R5C841 looks to the primary PCI as a separate secondary 

bus residing in a single device. The PC Card, the IEEE 1394, the SD Card, the Memory Stick and 

the xD Picture Card have their own register spaces. 

The PCI Configuration registers are used to control the basic operations, as settings and status 

control of the PCI device. Each function has 256 byte of configuration space.   

The CardBus Card Control registers are used to manage status changed events, remote wakeup 

events and status information about the PC Card in the socket. These registers are used for PC 

Card-32 as well as PC Card-16. The PC Card Control Register Base Address register points to 

the 4 Kbyte memory mapped I/O space that contains both the PC Card-32 and PC Card-16 

Status and Control registers. Socket Status/Control Registers for Card-32 are placed in the lower 

2Kbyte of the 4Kbyte and start at offset 000h.   

The Socket Status/Control Registers for the PC Card-16 are placed in the upper 2Kbyte of the 

4Kbyte pointed by the PC Card Control Register Base Address register and start at offset 800h. 

Legacy mode allows all 16-bit Card Control registers to be accessed through the index/data port 

at I/O address 3E0/3E2 in order to maintain the backward compatibility like the Ricoh 

RF5C396/366 that is the Intel 82365-compatible device. 

   

The 1394 OHCI-LINK registers are 2Kbyte of register compliant with the 1394 OHCI 

specifications. The 1394 OHCI Register Base Address register points to the 2Kbyte memory 

mapped I/O space. These registers are used to control OHCI-LINK and to set DMA context.   

The 1394 PHY registers are compliant with the IEEE1394a-2000 standard specifications. These 

registers are used to set the PHY block (ex. the value of Gap count.) and are accessed through 

the PHY Control register in the 1394 OHCI-LINK register space.    

The SD Card Control registers, compliant with the SD Host Controller Standard specification, are 

256byte of register assigned to control the SD card. These registers are used to set for access to 

the SD card, to give commands and to read/write data. These are placed in the memory mapped 

I/O space by the SD Card Register Base Address register.