Advanced I/O Controller with Motherboard GLUE Logic
Datasheet
nDIR
t3
t4
nSTEP
t1
t2
t9
t5
nDS0
nINDEX
nRDATA
nWDATA
t6
t7
t8
Figure 13.12 – Floppy Disk Drive Timing (At Mode Only)
NAME
t1
t2
t3
t4
DESCRIPTION
nDIR Set Up to STEP Low
nSTEP Active Time Low
nDIR Hold Time after nSTEP
nSTEP Cycle Time
nDS0 Hold Time from nSTEP Low (Note)
nINDEX Pulse Width
MIN
TYP
4
24
96
132
20
2
MAX
UNITS
X*
X*
X*
X*
t5
t6
X*
X*
t7
t8
t9
nRDATA Active Time Low
nWDATA Write Data Width Low
nDS0 Setup Time nDIR Low (Note)
40
.5
ns
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 setup and hold time must be met by software.
Revision 1.8 SMSC/Non-SMSC Register Sets (02-24-05)
204
SMSC LPC47M182
DATASHEET
SMSC [ SMSC CORPORATION ]
