Datasheet

MPC8308 PowerQUICC II Pro Processor Hardware Specification, Rev. 3
50 Freescale Semiconductor
JTAG
14 JTAG
This section describes the DC and AC electrical specifications for the IEEE Std 1149.1™ (JTAG)
interface.
14.1 JTAG DC Electrical Characteristics
This table provides the DC electrical characteristics for the IEEE 1149.1 (JTAG) interface.
14.2 JTAG AC Timing Specifications
This section describes the AC electrical specifications for the IEEE 1149.1 (JTAG) interface.
This table provides the JTAG AC timing specifications as defined in Figure 41 through Figure 44.
Table 41. JTAG Interface DC Electrical Characteristics
Characteristic Symbol Condition Min Max Unit
Input high voltage V
IH
—2.1NV
DD
+0.3 V
Input low voltage V
IL
—–0.30.8V
Input current I
IN
—±5A
Output high voltage V
OH
I
OH
= –8.0 mA 2.4 — V
Output low voltage V
OL
I
OL
= 8.0 mA — 0.5 V
Output low voltage V
OL
I
OL
= 3.2 mA — 0.4 V
Table 42. JTAG AC Timing Specifications (Independent of SYS_CLK_IN)
1
At recommended operating conditions (see Ta bl e 2 ).
Parameter Symbol
2
Min Max Unit Note
JTAG external clock frequency of operation f
JTG
033.3MHz—
JTAG external clock cycle time t
JTG
30 — ns —
JTAG external clock pulse width measured at 1.4 V t
JTKHKL
15 — ns —
JTAG external clock rise and fall times t
JTGR
& t
JTGF
02ns—
TRST assert time t
TRST
25 — ns 3
Input setup times:
Boundary-scan data
TMS, TDI
t
JTDVKH
t
JTIVKH
4
4
—
—
ns
4
Input hold times:
Boundary-scan data
TMS, TDI
t
JTDXKH
t
JTIXKH
10
10
—
—
ns
4
Valid times:
Boundary-scan data
TDO
t
JTKLDV
t
JTKLOV
2
2
11
11
ns
5