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W83977EF-AW Datasheet(PDF) 19 Page - Winbond |
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W83977EF-AW Datasheet(HTML) 19 Page - Winbond |
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19 / 142 page  W83977EF-AW/W83977EG-AW Publication Release Date: Apr. 2006 -17- Revision 1.2 4.6 FDC Interface SYMBOL PIN I/O FUNCTION DRVDEN0 2 OD24 Drive Density Select bit 0. DRVDEN1 3 OD24 Drive Density Select bit 1. (CR2A bit 1_0 = 00, default) GP10 IO24t General purpose I/O port 1 bit 0. (CR2A bit 1_0 = 01) (IRQIN1) Alternate Function from GP10: Interrupt channel input. P12 IO24t KBC P12 I/O port. (CR2A bit 1_0 = 10) SCI# OUT12t System Control Interrupt (CR2A bit 1_0 = 11) HEAD# 5 OD24 Head select. This open drain output determines which disk drive head is active. Logic 1 = side 0 Logic 0 = side 1 WE# 9 OD24 Write enable. An open drain output. WD# 10 OD24 Write data. This logic low open drain writes pre-compensation serial data to the selected FDD. An open drain output. STEP# 11 OD24 Step output pulses. This active low open drain output produces a pulse to move the head to another track. DIR# 12 OD24 Direction of the head step motor. An open drain output. Logic 1 = outward motion Logic 0 = inward motion MOB# 13 OD24 Motor B On. When set to 0, this pin enables disk drive 1. This is an open drain output. DSA# 14 OD24 Drive Select A. When set to 0, this pin enables disk drive A. This is an open drain output. DSB# 15 OD24 Drive Select B. When set to 0, this pin enables disk drive B. This is an open drain output. MOA# 16 OD24 Motor A On. When set to 0, this pin enables disk drive 0. This is an open drain output. DSKCHG# 4 INcs Diskette change. This signal is active low at power on and whenever the diskette is removed. This input pin is pulled up internally by a 1 K Ω resistor. The resistor can be disabled by bit 7 of L0-CRF0 (FIPURDWN). RDATA# 6 INcs The read data input signal from the FDD. This input pin is pulled up internally by a 1 K Ω resistor. The resistor can be disabled by bit 7 of L0-CRF0 (FIPURDWN). WP# 7 INcs Write protected. This active low Schmitt input from the disk drive indicates that the diskette is write-protected. This input pin is pulled up internally by a 1 K Ω resistor. The resistor can be disabled by bit 7 of L0-CRF0 (FIPURDWN). TRAK0# 8 INcs Track 0. This Schmitt-triggered input from the disk drive is active low when the head is positioned over the outermost track. This input pin is pulled up internally by a 1 K Ω resistor. The resistor can be disabled by bit 7 of L0-CRF0 (FIPURDWN). INDEX# 17 INcs This Schmitt-triggered input from the disk drive is active low when the head is positioned over the beginning of a track marked by an index hole. This input pin is pulled up internally by a 1 K Ω resistor. The resistor can be disabled by bit 7 of L0-CRF0 (FIPURDWN). |
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