参数资料
型号: PC87393F-VJG
厂商: NATIONAL SEMICONDUCTOR CORP
元件分类: 外设及接口
英文描述: 100-Pin LPC SuperI/O Devices for Portable Applications
中文描述: MULTIFUNCTION PERIPHERAL, PQFP100
封装: TQFP-100
文件页数: 26/148页
文件大小: 1733K
代理商: PC87393F-VJG
121
www.national.com
8.0
Legacy Functional Blocks
This chapter briefly describes the following blocks that provide legacy device functions:
q
Floppy Disk Controller (FDC)
q
Parallel Port
q
Serial Port 1 (SP1), UART Functionality for both Serial Port 1 and Serial Port 2
q
Serial Port 2 (SP2), Infrared Functionality
The description of each Legacy block includes the sections listed below. For details on the general implementation of each
legacy block, see the
SuperI/O Legacy Functional Blocks datasheet.
q
General Description
q
Register Map table(s)
q
Bitmap table(s).
The register maps in this chapter use the following abbreviations for Type:
q
R/W = Read/Write
q
R = Read from a specic address returns the value of a specic register. Write to the same address is to a different
register.
q
W=Write
q
RO = Read Only
q
R/W1C = Read/Write 1 to Clear. Writing 1 to a bit clears it to 0. Writing 0 has no effect.
8.1
FLOPPY DISK CONTROLLER (FDC)
8.1.1
General Description
The generic FDC is a standard FDC with a digital data separator, and is DP8473 and N82077 software compatible.
The FDC is implemented in this device as follows:
q
FM and MFM modes are supported. To select either mode, set bit 6 of the rst command byte when writing to/read-
ing from a diskette, where:
0 = FM mode
1 = MFM mode
q
Automatic media sense is supported by MSEN1-0 pins only on FDC signals routed to the PPM functional block (on
the Parallel Port).
q
DRATE1 is not supported.
q
A logic 1 is returned for all oating (TRI-STATE) FDC register bits upon LPC I/O read cycles.
8.1.2
FDC Register Map
Offset
Mnemonic
Register Name
Type
00h
SRA
Status A
RO
01h
SRB
Status B
RO
02h
DOR
Digital Output
R/W
03h
TDR
Tape Drive
R/W
04h
MSR
Main Status
R
DSR
Data Rate Select
W
05h
FIFO
Data (FIFO)
R/W
06h
Reserved
07h
DIR
Digital Input
R
CCR
Conguration Control
W
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