PC8374L datasheet(61/239 Pages) NSC

61 / 239 page

3.0 Device Architecture and Configuration (Continued)

Revision 1.1

www.national.com

3.8.3

FDC Configuration Register

This register is reset to 24h.

Power Well: VDD3

Location:

Indexes F0h and F8h

Type:

R/W

Bit

76543210

Name

Reserved

TDR

Mode

DENSEL

Polarity

Control

FDC 2Mbps

Enable

Write

Protect

PC-AT or

PS/2 Drive

Mode Select

Reserved

TRI-STATE

Control

Reset

00100100

Bit

Type

Description

Reserved.

R/W TDR Register Mode.

0: PC-AT-Compatible Drive mode; i.e., bits 7-2 of the TDR are ‘111111’ (default)

1: Enhanced Drive mode

R/W DENSEL Polarity Control.

0: Active low for 500 Kbps or 1 or 2 Mbps data rates

1: Active high for 500 Kbps or 1 or 2 Mbps data rates (default)

R/W FDC 2Mbps Enable. Is set only when a 2 Mbps drive is used.

0: 2 Mbps disabled and the FDC clock is 24 MHz (default)

1: 2 Mbps enabled and the FDC clock is 48 MHz

R/W Write Protect. Enables forcing of write protect functionality by software. When set, writes to the floppy

disk drive are disabled. This effect is identical to an active WP signal.

0: Write protected according to WP signal (default)

1: Write protected regardless of value of WP signal

R/W PC-AT or PS/2 Drive Mode Select.

0: PS/2 Drive mode

1: PC-AT Drive mode (default)

Reserved.

R/W TRI-STATE Control. When this bit is set to 1 and the logical device is inactive, the logical device output

pins are in TRI-STATE (see Section 3.3.2 on page 48).

0: Normal outputs (default)

1: TRI-STATE outputs when the logical device is inactive

Winbond Electronics Corp. Advanced PC Product Center

PC8374L Datasheet(PDF) 61 Page - National Semiconductor (TI)

PC8374L Datasheet(HTML) 61 Page - National Semiconductor (TI)

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 ...More

Datasheet Download

Link URL