LPC47B34X Datasheet, PDF (33/250 Pages) SMSC Corporation – 128 Pin Enhanced Super I/O with LPC Interface for Consumer Applications

DRIVE RATE
Table 7 – Data Rates
DATA RATE
DATA RATE
DRT1 DRT0 SEL1 SEL0 MFM FM
0
0
1
1
1Meg
---
0
0
0
0
500
250
0
0
0
1
300
150
0
0
1
0
250
125
0
1
1
1
1Meg
---
0
1
0
0
500
250
0
1
0
1
500
250
0
1
1
0
250
125
1
0
1
1
1Meg
---
1
0
0
0
500
250
1
0
0
1
2Meg
---
1
0
1
0
250
125
DENSEL
1
1
0
0
1
1
0
0
1
1
0
0
DRATE(1)
1
0
1
1
0
0
0
1
1
0
1
1
0
0
0
1
1
0
1
1
0
0
0
1
1
0
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.
DT1 DT0
0
0
1
0
0
1
1
1
Table 8 – DRVDEN Mapping
DRVDEN1 (1) DRVDEN0 (1)
DRIVE TYPE
DRATE0
DENSEL
4/2/1 MB 3.5"
2/1 MB 5.25" FDDS
2/1.6/1 MB 3.5" (3-MODE)
DRATE0
DRATE1
DRATE0
nDENSEL PS/2
DRATE1
DRATE0
Table 9 – Default Precompensation Delays
PRECOMPENSATIO
DATA RATE
N DELAYS
2 Mbps
20.8 ns
1 Mbps
41.67 ns
500 Kbps
125 ns
300 Kbps
125 ns
250 Kbps
125 ns
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