nDIR
t3
t4
nSTEP
t1
t2
t9
t5
nDS0-1
nINDEX
t6
t7
t8
nRDATA
nWDATA
FIGURE 27 – FLOPPY DISK DRIVE TIMING (AT MODE ONLY)
NAME
t1
DESCRIPTION
nDIR Set Up to STEP Low
MIN
TYP
4
MAX
UNITS
X*
t2
t3
t4
t5
nSTEP Active Time Low
nDIR Hold Time after STEP#
nSTEP Cycle Time
nDS0 & nDS1 Hold Time from nSTEP Low (Note)
nINDEX Pulse Width
24
96
132
20
2
X*
X*
X*
X*
t6
X*
t7
nRDATA Active Time Low
40
ns
t8
t9
nWDATA Write Data Width Low
nDS0 & nDS1, Setup Time nDIR Low (Note)
.5
Y*
ns
0
*X specifies one MCLK period and Y specifies one WCLK period.
MCLK = 16 x Data Rate (at 500 kb/s MCLK = 8 MHz)
WCLK = 2 x Data Rate (at 500 kb/s WCLK = 1 MHz)
Note: The DS0 &DS1 setup and hold times must be met by software.
SMSC DS – LPC47M14X
Page 186
Rev. 03/19/2001
SMSC [ SMSC CORPORATION ]
