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OXCFU950 Datasheet(PDF) 21 Page - Oxford Semiconductor |
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OXCFU950 Datasheet(HTML) 21 Page - Oxford Semiconductor |
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21 / 74 page  DS-0023 February 2007 External—Free Release Page 21 of 74 OXCFU950 DATA SHEET OXFORD SEMICONDUCTOR, INC. 0x1C Alternate UART I/O Base 0 Register Read/Write Bits Description EEPROM Host Access Reset 7:0 Alternate UART I/O base address bits 7:0 W R/W 00000000 0x1D Alternate UART I/O Base 1 Register Read/Write Bits Description EEPROM Host Access Reset 7:3 Alternate UART I/O base address bits 15:11 - R 00000 2:0 Alternate UART I/O base address bits 10:8 W R/W 000 0x1E Alternate USB I/O Base 0 Register Read/Write Bits Description EEPROM Host Access Reset 7:0 Alternate USB I/O base address bits 7:0 W R/W 00000000 0x1F Alternate USB I/O Base 1 Register Read/Write Bits Description EEPROM Host Access Reset 7:3 Alternate USB I/O base address bits 15:11 - R 00000 2:0 Alternate USB I/O base address bits 10:8 W R/W 000 0x20 to 0x40 USB Host Controller Notes See Section 7 for details of the USB host controller register map. 6.6 PC Card/CompactFlash Interrupt 6.6.1 Interrupt Generation PCMCIA 16-bit PC Cards and CompactFlash/CF+ cards support pulse or level type interrupt signals to request interrupt service from the host system. The CIS of the card specifies whether pulse, level or both types of interrupt can be generated. When the host has read the CIS, it can set the LevlReq field in the Configuration Options Register (COR) for each function, to tell the card which type of interrupts should be generated. The OXCFU950 can generate either type of interrupt. However, to reduce power consumption, the default CIS states that only level type interrupts can be generated. A custom CIS can be constructed to direct the card to generate pulse type interrupts if required, by using appropriate EEPROM values. The OXCFU950 uses a clock divider circuit clocked at 12 MHz to generate pulse type interrupts. The generated pulse is guaranteed to be greater than the minimum length of 0.5 μs as defined in the PCMCIA standard. 6.6.2 Interrupt Sources The OXCFU950 has six possible interrupt sources: the UART function, the USB host controller function and the four multi-purpose I/O (MIO) pins, which can be configured as interrupts using the MIO configuration register (MIO [3:0]) and the interrupt status and control register (ISR) The OXCFU950 is a multi-function device with two functions, the UART function (function 0) and the USB host controller function (function 1). Interrupts generated by MIO [3:0] are mapped to UART function 0 so that any MIO enabled interrupt sets the Intr bit to ‘1’ in the UART CSR. |
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