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PDF FDC37C78 Data sheet ( Hoja de datos )
| Número de pieza | FDC37C78 | |
| Descripción | Floppy Disk Controller | |
| Fabricantes | SMSC Corporation | |
| Logotipo |  |
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FDC37C78
Floppy Disk Controller
FEATURES
• 3.3/5 Volt Operation
• Intelligent Auto Power Management
• 2.88MB FDC37C78 Floppy Disk Controller
- Licensed CMOS 765B Floppy Disk
Controller
- Software and Register Compatible with
SMSC's Proprietary 82077AA
Compatible Core
- Supports Two Floppy Drives Directly
- Supports Vertical Recording Format
- 16 Byte Data FIFO
- 100% IBM Compatibility
- DMA Enable Logic
- Data Rate and Drive Control Registers
- Swap Drives A and B
- Non-Burst Mode DMA Option
- Detects All Overrun and Underrun
Conditions
- Sophisticated Power Control Circuitry
(PCC) Including Multiple Powerdown
Modes for Reduced Power
Consumption
• Enhanced Digital Data Separator
- 2 Mbps (Only Available When VCC = 5V),
1 Mbps, 500 Kbps, 300 Kbps, 250 Kbps
Data Rates
- Programmable Precompensation Modes
• 48 pin TQFP Package
1 page  
FDC37C78 PIN OUT
FDC37C78 48 Pin FDC
PIN #
NAME
1 nDACK
2 D0
3 D1
4 D2
5 D3
6 VSS
7 VCC
8 D4
9 D5
10 D6
11 D7
12 VCC
13 IRQ
14 TC
15 nTRK0
16 nINDEX
17 nWRTPRT
18 VSS
19 VCC
20 nDSKCHG
21 nRDATA
22 DRVDEN0
23 DRVDEN1
24 DENSEL
Note: “n” denotes active low signal.
PIN #
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
NAME
MEDIA_ID0
MEDIA_ID1
nWDATA
nWGATE
nHDSEL
VSS
nSTEP
VCC
nDIR
nMTR1/IDLE
nDS1/PD
nMTR0
nDS0
RESET
X2
X1
VSS
A2
A1
A0
nCS
nIOR
nIOW
DRQ
5
5 Page 
FLOPPY DISK CONTROLLER
The Floppy Disk Controller (FDC) provides the
interface between a host microprocessor and the
floppy disk drives. The FDC integrates the
functions of the Formatter/Controller, Digital Data
Separator, Write Precompensation and Data Rate
Selection logic for an IBM XT/AT compatible FDC.
The true CMOS 765B core guarantees 100% IBM
PC XT/AT compatibility in addition to providing
data overflow and underflow protection.
The FDC37C78 is compatible to the
82077AA using SMSC's proprietary floppy disk
controller core.
FLOPPY DISK CONTROLLER INTERNAL
REGISTERS
The Floppy Disk Controller contains eight internal
registers which facilitate the interfacing between
the host microprocessor and the disk drive. Table
2 shows the addresses required to access these
registers. Registers other than the ones shown
are not supported. The rest of the FDC
description assumes the Base I/O Address is 3F0.
BASE I/O
ADDRESS
+0
+1
+2
+3
+4
+4
+5
+6
+7
+7
Table 2 - Status, Data and Control Registers
REGISTER
Reserved
Reserved
R/W Digital Output Register
R/W Tape Drive Register
R Main Status Register
W Data Rate Select Register
R/W Data (FIFO)
Reserved
R Digital Input Register
W Configuration Control Register
DOR
TSR
MSR
DSR
FIFO
DIR
CCR
11
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet FDC37C78.PDF ] | |
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