AMD Geode™ SC2200 Processor Data Book 403
Electrical Specifications 32580B
Table 9-25. IDE Register Transfer to/from Device Timing Parameters
Symbol Parameter
Mode
Unit Comments01235
t0Cycle time (min) 600 383 240 180 120 ns Note 1
t1Address valid to IDE_IOR[0:1]#/
IDE_IOW[0:1]# setup (min)
70 50 30 30 25 ns
t2IDE_IOR[0:1]#/IDE_IOW[0:1]# pulse
width 8-bit (min)
290 290 290 80 70 ns Note 1
t2i IDE_IOR[0:1]#/IDE_IOW[0:1]#
recovery time (min)
- - - 70 25 ns Note 1
t3IDE_IOW[0:1]# data setup (min) 6045303020ns
t4IDE_IOW[0:1]# data hold (min) 30 20 15 10 10 ns
t5IDE_IOR[0:1]# data setup (min) 5035202020ns
t6IDE_IOR[0:1]# data hold (min) 55555ns
t6Z IDE_IOR[0:1]# data TRI-STATE
(max)
30 30 30 30 30 ns Note 2
t9IDE_IOR[0:1]#/IDE_IOW[0:1]# to
address valid hold (min)
20 15 10 10 10 ns
tRD Read data valid to IDE_IORDY[0:1]
active (if IDE_IORDY[0:1] initially low
after tA (min)
00000ns
tAIDE_IORDY[0:1] setup time 35 35 35 35 35 ns Note 3
tBIDE_IORDY[0:1] pulse width (max) 1250 1250 1250 1250 1250 ns
tCIDE_IORDY[0:1] assertion to release
(max)
55555ns
Note 1. t0 is the minimum total cycle time, t2 is the minimum command active time, and t2i is the minimum command recov-
ery time or command inactive time. The actual cycle time equals the sum of the command active time and the com-
mand inactive time. The three timing requirements of t0, t2, and t2i are met. The minimum total cycle time
requirements is greater than the sum of t2 and t2i. (This means that a host implementation can lengthen t2 and/or
t2i to ensure that t0 is equal to or greater than the value reported in the device’s IDENTIFY DEVICE data.)
Note 2. This parameter specifies the time from the rising edge of IDE_IOR[0:1]# to the time that the data bus is no longer
driven by the device (TRI-STATE).
Note 3. The delay from the activation of IDE_IOR[0:1]# or IDE_IOW[0:1]# until the state of IDE_IORDY[0,1] is first sampled.
If IDE_IORDY[0:1] is inactive, then the host waits until IDE_IORDY[0:1] is active before the PIO cycle is completed.
If the device is not driving IDE_IORDY[0:1] negated after activation (tA) of IDE_IOR[0:1]# or IDE_IOW[0:1]#, then
t5 is met and tRD is not applicable. If the device is driving IDE_IORDY[0:1] negated after activation (tA) of
IDE_IOR[0:1]# or IDE_IOW[0:1]#, then tRD is met and t5 is not applicable.