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FDC37C666GT 数据表(PDF) 9 Page - SMSC Corporation |
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FDC37C666GT 数据表(HTML) 9 Page - SMSC Corporation |
9 / 152 page 9 DESCRIPTION OF PIN FUNCTIONS PIN NO. NAME SYMBOL BUFFER TYPE DESCRIPTION 1 Density Select DENSEL OD48 Indicates whether a low (250/300 Kb/s) or high (500 Kb/s) data rate has been selected. This is determined by the IDENT bit in Configuration Register 3. 14 nWrite Protected nWRTPRT IS This active low Schmitt Trigger input senses from the disk drive that a disk is write protected. Any write command is ignored. 13 nTrack 00 nTR0 IS This active low Schmitt Trigger input senses from the disk drive that the head is positioned over the outermost track. 12 nIndex nINDEX IS This active low Schmitt Trigger input senses from the disk drive that the head is positioned over the beginning of a track, as marked by an index hole. 19,18 19,18 Data Rate 0, Data Rate 1 Media ID0, Media ID1 DRATE0, DRATE1 O24 I These two outputs reflect bits 0 and 1 respectively of the Data Rate Register. At power on, these two outputs are in a high impedance state (refer to Table 50). In Floppy Enhanced Mode 2 - These bits are the Media ID 0,1 inputs. The value of these bits can be read as bits 6 and 7 of the Floppy Tape register. SERIAL PORT INTERFACE 78,88 Receive Data RXD1, RXD2 I Receiver serial data input. 79 Transmit Data TXD1 PCF0 O4 I Transmitter serial data output from Primary Serial Port. FDC37C666GT (Adapter Mode): Parallel Port Configuration Control 0. During reset active this input is read and latched to define the address of the Parallel Port. |
类似零件编号 - FDC37C666GT |
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类似说明 - FDC37C666GT |
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