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FDC37C665IR Fiches technique(PDF) 5 Page - SMSC Corporation |
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FDC37C665IR Fiches technique(HTML) 5 Page - SMSC Corporation |
5 / 162 page 5 DESCRIPTION OF PIN FUNCTIONS PIN NO. NAME SYMBOL BUFFER TYPE DESCRIPTION HOST PROCESSOR INTERFACE 48-51 53-56 Data Bus 0-7 D0-D7 I/O12 The data bus connection used by the host microprocessor to transmit data to and from the FDC37C665IR. These pins are in a high-impedance state when not in the output mode. 44 nI/O Read nIOR I This active low signal is issued by the host microprocessor to indicate a read operation. 45 nI/O Write nIOW I This active low signal is issued by the host microprocessor to indicate a write operation. 46 Address Enable AEN I Active high Address Enable indicates DMA operations on the host data bus. Used internally to qualify appropriate address decodes. 28-34 41-43 I/O Address A0-A9 I These host address bits determine the I/O address to be accessed during nIOR and nIOW cycles. These bits are latched internally by the leading edge of nIOR and nIOW. 52 FDC DMA Request FDRQ O12 This active high output is the DMA request for byte transfers of data to the host. This signal is cleared on the last byte of the data transfer by the nDACK signal going low (or by nIOR going low if nDACK was already low as in demand mode). 36 nDMA Acknowledge nDACK I An active low input acknowledging the request for a DMA transfer of data. This input enables the DMA read or write internally. 35 Terminal Count TC I This signal indicates to the FDC37C665IR that data transfer is complete. TC is only accepted when nDACK or nPDACK is low. In AT and PS/2 model 30 modes, TC is active high and in PS/2 mode, TC is active low. |
Numéro de pièce similaire - FDC37C665IR |
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Description similaire - FDC37C665IR |
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