lpc47s457-ns Standard Microsystems Corp., lpc47s457-ns Datasheet - Page 34

• Manufacturer Part Number: lpc47s457-ns
• Description: Advanced I/o With X-bus Interface
• Manufacturer: Standard Microsystems Corp.

Drive Rate Table (Recommended)
Note 1: The DRATE and DENSEL values are mapped onto the DRVDEN pins.
SMSC DS – LPC47S45x
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
00 = 360K, 1.2M, 720K, 1.44M and 2.88M Vertical Format
01 = 3-Mode Drive
10 = 2 Meg Tape
DATA RATE
DRVDEN1 (1)
PRECOMP
1
0
0
1
1
0
0
1
1
0
0
1
DRATE0
DRATE0
DRATE0
DRATE1
Table 7 − Precompensation Delays
432
111
001
010
011
100
101
110
000
Table 9 − DRVDEN Mapping0
SEL0
DATASHEET
1
0
1
0
1
0
1
0
1
0
1
0
Table 8 − Data Rates
Page 34 of 259
1Meg
1Meg
1Meg
2Meg
MFM
500
300
250
500
500
250
500
250
PRECOMPENSATION
DATA RATE
Default: See Table 10
<2Mbps
Default
125.00
166.67
208.33
250.00
DRVDEN0 (1)
41.67
83.34
0.00
nDENSEL
DELAY (nsec)
DENSEL
DRATE1
DRATE0
250
150
125
250
250
125
250
125
FM
---
---
---
---
Default
2Mbps
104.2
20.8
41.7
62.5
83.3
125
4/2/1 MB 3.5"
2/1 MB 5.25" FDDS
2/1.6/1 MB 3.5" (3-MODE)
PS/2
0
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
Rev. 04-30-07