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FDC37C665IR データシート(PDF) 8 Page - SMSC Corporation |
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FDC37C665IR データシート(HTML) 8 Page - SMSC Corporation |
8 / 162 page 8 DESCRIPTION OF PIN FUNCTIONS PIN NO. NAME SYMBOL BUFFER TYPE DESCRIPTION 99 nMotor On 3 nMTR3 PDRQ OD20 O12 Motor On 3: Refer to Note 1. In ECP Mode, MTR3 is the Parallel Port DMA Request output. Active High. 1 Density Select DENSEL OD20 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 MEDIA_ID0 MEDIA_ID1 O4 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 53). 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/IRRX I Receiver serial data input or IR data input. 79 Transmit Data TXD1 O2 Transmitter serial data output from Primary Serial Port. 81 nRequest to Send nRTS1 O2 Active low Request to Send output for Primary Serial Port. Handshake output signal notifies modem that the UART is ready to transmit data. This signal can be programmed by writing to bit 1 of Modem Control Register (MCR). The hardware reset will reset the nRTS signal to inactive mode (high). Forced inactive during loop mode operation. |
同様の部品番号 - FDC37C665IR |
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同様の説明 - FDC37C665IR |
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