t3
nDIR
t4
t1
t2
nSTEP
t5
nDS0-3
nINDEX
t6
t7
t8
nRDATA
nWDATA
nIOW
t9
t9
nDS0-1,
MTR0-1
FIGURE 9 - DISK DRIVE TIMING (AT MODE ONLY)
NAME
DESCRIPTION
nDIR Set Up to STEP Low
MIN
TYP
4
MAX
UNITS
X*
t1
t2
t3
t4
t5
t6
t7
t8
t9
nSTEP Active Time Low
24
96
132
20
2
X*
nDIR Hold Time after nSTEP
nSTEP Cycle Time
X*
X*
nDS0-1 Hold Time from nSTEP Low
nINDEX Pulse Width
X*
X*
nRDATA Active Time Low
nWDATA Write Data Width Low
nDS0-1, MTRO-1 from End of nIOW
40
.5
ns
Y*
25
ns
*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)
175
SMSC [ SMSC CORPORATION ]
