Datasheet

JTAG Timing
56F8037/56F8027 Data Sheet, Rev. 8
Freescale Semiconductor 161
10.14 JTAG Timing
Figure 10-16 Test Clock Input Timing Diagram
Figure 10-17 Test Access Port Timing Diagram
Table 10-19 JTAG Timing
Characteristic Symbol Min Max Unit See Figure
TCK frequency of operation
1
1. TCK frequency of operation must be less than 1/8 the processor rate.
f
OP
DC SYS_CLK/8 MHz 10-16
TCK clock pulse width
t
PW
50 — ns 10-16
TMS, TDI data set-up time
t
DS
5—ns 10-17
TMS, TDI data hold time
t
DH
5—ns 10-17
TCK low to TDO data valid
t
DV
—30ns 10-17
TCK low to TDO tri-state
t
TS
—30ns 10-17
TCK
(Input)
V
M
V
IL
V
M
= V
IL
+ (V
IH
– V
IL
)/2
t
PW
1/f
OP
t
PW
V
M
V
IH
Input Data Valid
Output Data Valid
t
DS
t
DH
t
DV
t
TS
TCK
(Input)
TDI
(Input)
TDO
(Output)
TDO
(Output
)
TMS