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參數(shù)資料
| 型號(hào)： | 97CFDC |
| 廠商： | SMSC Corporation |
| 英文描述： | USB FLOPPY DISK CONTROLLER |
| 中文描述： | 軟盤(pán)控制器的USB |
| 文件頁(yè)數(shù)： | 18/20頁(yè) |
| 文件大?。?/td> | 143K |
| 代理商： | 97CFDC |
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SMSC DS – USB97CFDC
Page 7
Rev. 12/15/2000
BLOCK DIAGRAM
Pin Descriptions
PIN NO.
NAME
SYMBOL
BUFFER
TYPE
DESCRIPTION
FLOPPY DISK INTERFACE
75
Read Disk
Data
nRDATA
IS
Raw serial bit stream from the disk drive, low
active.
Each falling edge represents a flux
transition of the encoded data.
69
Write
Data
nWDATA
OD12
This active low high current driver provides the
encoded data to the disk drive. Each falling edge
causes a flux transition on the media.
71
Head
Select
nHDSEL
OD12
This high current output selects the floppy disk
side for reading or writing. A logic "1" on this pin
means side 0 will be accessed, while a logic "0"
means side 1 will be accessed.
67
Direction
Control
nDIR
OD12
This high current low active output determines the
direction of the head movement.
A logic "1" on
this pin means outward motion, while a logic "0"
means inward motion.
68
Step Pulse
nSTEP
OD12
This active low high current driver issues a low
pulse for each track-to-track movement of the
head.
76
Disk Change
nDSKCHG
IS
This input senses that the drive door is open or
that the diskette has possibly been changed since
the last drive selection.
8051 CPU
8237
4k Data Buffer RAM
Memory
Management
Unit
Map RAM
Arbiter
SIE DMA
RX/
TX
Queue
End Point
Control
Serial Interface Engine
GPIO
nMEMEN
FD[7:0]
nFRD
nFCE
Option
Select/
Drive
Control
Flash/
SRAM
Interface
IRQ0
SD[7:0]
SA[13:0]
nIOW
nIOR
nMEMW
nMEMR
High Speed
USB
XCVR
To USB Bus
FA[15:0]
FLOPPY DISK
CONTROLLER
DRQ2
TC
nDAK2
ADDRESS
DECODE
nCE
AEN
SRAM
Interface
nTRK0, nINDEX,
nWRTPRT, nDSKCHG
nRDATA, DRVDEN0,
DRVDEN1, nWDATA,
nWGATE, nHDSEL,
nDIR, nMTR0, nDS0,
nSTEP
DRIVE
INTERFACE
CLOCK
CONTROL
nOPTEN
nDRVRDY
nFDPWR
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