Table 11 - Data Rates
DATA RATE DATA RATE
SEL1 SEL0
DENSEL
DRIVE RATE
DRATE(1)
DRT1
DRT0
MFM
FM
1
0
0
0
0
0
0
0
0
0
1
0
0
1
1
0
1
0
1Meg
500
---
1
1
0
0
1
0
0
1
1
0
1
0
250
150
125
300
250
0
0
0
0
1
1
1
1
1
0
0
1
1
0
1
0
1Meg
500
---
1
1
0
0
1
0
0
1
1
0
1
0
250
250
125
500
250
1
1
1
1
0
0
0
0
1
0
0
1
1
0
1
0
1Meg
500
---
250
---
1
1
0
0
1
0
0
1
1
0
1
0
2Meg
250
125
Drive Rate Table (Recommended) 00 = 360K, 1.2M, 720K, 1.44M and 2.88M Vertical Format
01 = 3-Mode Drive
10 = 2 Meg Tape
Note 1: The DRATE and DENSEL values are mapped onto the DRVDEN pins.
Table 12 - DRVDEN Mapping
DT1
0
DT0
0
DRVDEN1 (1)
DRVDEN0 (1)
DRIVE TYPE
4/2/1 MB 3.5"
DRATE0
DENSEL
2/1 MB 5.25" FDDS
2/1.6/1 MB 3.5" (3-
MODE)
1
0
1
0
1
1
DRATE0
DRATE0
DRATE1
DRATE1
nDENSEL
DRATE0
PS/2
22
SMSC [ SMSC CORPORATION ]
