mpc8270vr Freescale Semiconductor, Inc, mpc8270vr Datasheet - Page 22

• Manufacturer Part Number: mpc8270vr
• Description: Mpc8275 Powerquicc Ii Integrated Communications Processor
• Manufacturer: Freescale Semiconductor, Inc

AC Electrical Characteristics
6.3 JTAG Timings
Table 14
22
JTAG external clock frequency of operation
JTAG external clock cycle time
JTAG external clock pulse width measured at 1.4V
JTAG external clock rise and fall times
TRST assert time
Input setup times
lists the JTAG timings.
Figure 12
The UPM machine outputs change on the internal tick determined by the memory
controller programming; the AC specifications are relative to the internal tick. The
SDRAM and GPCM machine outputs change on CLKin’s rising edge.
1:2, 1:3, 1:4, 1:5, 1:6
CLKin
CLKin
CLKin
PLL Clock Ratio
Parameter
Figure 12. Internal Tick Spacing for Memory Controller Signals
MPC8280 PowerQUICC™ II Family Hardware Specifications, Rev. 1.8
1:2.5
1:3.5
is a representation of the information in
T1
T1
T1
Table 13. Tick Spacing for Memory Controller Signals
Boundary-scan data
T2
T2
T2
1/4 CLKin
3/10 CLKin
4/14 CLKin
Tick Spacing (T1 Occurs at the Rising Edge of CLKin)
Table 14. JTAG Timings
TMS, TDI
T3
T3
T3
T2
NOTE
t
Symbol
T4
JTGR
t
t
t
JTDVKH
JTKHKL
JTIVKH
T4
t
t
T4
f
t
TRST
JTGF
1/2 CLKin
1/2 CLKin
1/2 CLKin
JTG
JTG
and
2
Table
T3
1
Min
13.
30
15
25
0
0
4
4
for 1:2, 1:3, 1:4, 1:5, 1:6
for 1:2.5
for 1:3.5
3/4 CLKin
8/10 CLKin
11/14 CLKin
Max
33.3
—
—
—
—
—
5
T4
Freescale Semiconductor
MHz
Unit
ns
ns
ns
ns
ns
ns
Notes
3
4
4
,
,
,
6
6
7
7