Datasheet

MPC5121E/MPC5123 Data Sheet, Rev. 5
Electrical and Thermal Characteristics
Freescale Semiconductor50
In PIO write mode, timing waveforms are somewhat different as shown in Figure 27.
Figure 27. PIO Write Mode Timing
To fulfill this timing, several parameters need to be observed as shown in Table 3-28.
t
5
t
5
t
5
(min) = t
co
+ t
su
+ t
buf
+ t
buf
+ t
cable1
+ t
cable2
If not met, increase time_2r A9.23
t
6
t
6
0 — A9.24
t
A
t
A
t
A(min)
= (1.5 + time_ax) × T – 
(t
co
+ t
sui
+ t
cable2
+ t
cable2
+ 2 × t
buf
)
calculate and programming
time_ax.
1
A9.25
t
rd
t
rd1
t
rd1(max)
= (– t
rd
) + (t
skew3
+ t
skew4
) 
t
rd1(min)
= (time_pio_rdx – 0.5 ) × T – (t
su
+ t
hi
) 
(time_pio_rdx – 0.5) × T > t
su
+ t
hi
+ t
skew3
+ t
skew4
calculate and programming
time_pio_rdx.
1
A9.26
t
0
— t
0(min)
= (time_1 + time_2 + time_9) × T time_1, time_2r, time_9 A9.27
1
See the MPC5121e Microcontroller Reference Manual.
Table 3-27. Timing Parameters PIO Read (continued)
ATA
Parameter
PIO Read
Mode Timing
Parameter
Value How to meet SpecID
ADDR
DIOR
Write Data (15:0)
IORDY
IORDY
t
1
t
2r
t
9
DIOW
buffer_en
t
on
t
A
t
B
t
4
t
off
t
1