FDC37M81x SMSC Corporation, FDC37M81x Datasheet - Page 25

• Manufacturer Part Number: FDC37M81x
• Description: PC98/99 Compliant Enhanced Super I/O Controller
• Manufacturer: SMSC Corporation

Drive Rate Table (Recommended)
Note 1: The DRATE and DENSEL values are mapped onto the DRVDEN pins.
DRT1
DRIVE RATE
DT1
0
0
0
0
0
0
0
0
1
1
1
1
0
1
0
1
DRT0
DT0
0
0
1
1
0
0
0
0
1
1
1
1
0
0
0
0
SEL1
DATA RATE
DRVDEN1 (1)
1
0
0
1
1
0
0
1
1
0
0
1
DRATE0
DRATE0
DRATE0
DRATE1
00 = 360K, 1.2M, 720K, 1.44M and 2.88M Vertical Format
01 = 3-Mode Drive
10 = 2 Meg Tape
Table 10 - DRVDEN Mapping
SEL0
1
0
1
0
1
0
1
0
1
0
1
0
Table 9 - Data Rates
1Meg
1Meg
1Meg
2Meg
MFM
500
300
250
500
500
250
500
250
DATA RATE
DRVDEN0 (1)
25
nDENSEL
DENSEL
DRATE1
DRATE0
250
150
125
250
250
125
250
125
FM
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4/2/1 MB 3.5"
2/1 MB 5.25" FDDS
2/1.6/1 MB 3.5" (3-MODE)
PS/2
DENSEL
1
1
0
0
1
1
0
0
1
1
0
0
DRIVE TYPE
DRATE(1)
1
1
0
0
1
1
0
0
1
1
0
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0