Datasheet

Electrical and Thermal Characteristics
MPC5121E/MPC5123 Data Sheet, Rev. 5
Freescale Semiconductor 49
3.3.9.2 PIO Mode Timing
A timing diagram for the PIO read mode is given in Figure 26.
Figure 26. PIO Read Mode Timing
To fulfill read mode timing, the different timing parameters given in Table 3-27 must be observed.
t
skew4
Max difference in cable propagation delay between: ATA_IORDY and
ATA_DATA (read)
Cable A9.14
t
skew5
Max difference in cable propagation delay between: ATA_DIOR,
ATA_DIOW, ATA_DMACK and ATA_CS0, ATA_CS1, ATA_DA2,
ATA_DA1, ATA_DA0, ATA_DATA (write)
Cable A9.15
tskew6
Max difference in cable propagation delay without accounting for ground
bounce
Cable A9.16
Table 3-27. Timing Parameters PIO Read
ATA
Parameter
PIO Read
Mode Timing
Parameter
Value How to meet SpecID
t
1
t
1
t
1
(min) = (time_1 × T) – (t
skew1
+ t
skew2
+ t
skew5
) calculate and programming
time_1.
1
A9.20
t
2
t
2
r t
2
(min) = (time_2r × T) – (t
skew1
+ t
skew2
+ t
skew5
) calculate and programming
time_2r.
1
A9.21
t
9
t
9
t
9
(min) = (time_9 × T) – (t
skew1
+ t
skew2
+ t
skew6
) calculate and programming
time_9.
1
A9.22
Table 3-26. PATA Timing Parameters (continued)
Name Meaning Controlled by Value SpecID
ADDR
DIOR
Read Data (15:0)
IORDY
IORDY
t
1
t
2r
t
9
t
5
t
A
t
6
t
rd1