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PC87366 数据表(PDF) 57 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
部件名 PC87366
功能描述  128-Pin LPC SuperI/O with System Hardware Monitoring, MIDI and Game Ports
PDF  240 Pages
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制造商  NSC [National Semiconductor (TI)]
网页  http://www.national.com
标志 NSC - National Semiconductor (TI)

PC87366 数据表(HTML) 57 Page - National Semiconductor (TI)

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2.0 Device Architecture and Configuration (Continued)
57
www.national.com
2.9.3
FDC Configuration Register
This register is reset by hardware to 24h.
Location:
Index F0h
Type:
R/W
Bit
76543210
Name
Reserved
TDR
Register
Mode
DENSEL
Polarity
Control
Reserved
Write
Protect
PC-AT or
PS/2 Drive
Mode Select
Reserved
TRI-STATE
Control
Reset
00100100
Required
0
0
Bit
Description
7
Reserved. Must be 0.
6
TDR Register Mode
0: PC-AT compatible drive mode; i.e., bits 7-2 of the TDR are 111111b (default)
1: Enhanced drive mode
5
DENSEL Polarity Control
0: Active low for 500 Kbps or 1 Mbps data rates
1: Active high for 500 Kbps or 1 Mbps data rates (default)
4
Reserved. Must be 0.
3
Write Protect. This bit allows forcing of write protect functionality by software. When set, writes to the floppy
disk drive are disabled. This effect is identical to WP when it is active.
0: Write protected according to WP signal (default)
1: Write protected regardless of value of WP signal
2
PC-AT or PS/2 Drive Mode Select
0: PS/2 drive mode
1: PC-AT drive mode (default)
1
Reserved
0
TRI-STATE Control. When enabled and the device is inactive, the logical device output pins are in TRI-STATE.
0: Disabled (default)
1: Enabled



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