MSC8154_11 Datasheet, PDF (52/68 Pages) Freescale Semiconductor, Inc – Quad-Core Digital Signal processor

2.6.7 Asynchronous Signal Timing
Table 35 lists the asynchronous signal timing specifications.
Table 37. Signal Timing
Input
Output
Note:
Characteristics
Symbol
t_IN
t_OUT
Input value relevant for EE0, IRQ[15–0], and NMI only.
Type
Asynchronous
Asynchronous
Min
One CLKIN cycle
Application dependent
The following interfaces use the specified asynchronous signals:
• GPIO. Signals GPIO[31–0], when used as GPIO signals, that is, when the alternate multiplexed special functions are
not selected.
Note:
•
•
•
•
•
When used as a general purpose input (GPI), the input signal should be driven until it is acknowledged by the
MSC8154 device, that is, when the expected input value is read from the GPIO data register.
EE port. Signals EE0, EE1.
Boot function. Signal STOP_BS.
I²C interface. Signals I2C_SCL and I2C_SDA.
Interrupt inputs. Signals IRQ[15–0] and NMI.
Interrupt outputs. Signals INT_OUT and NMI_OUT (minimum pulse width is 32 ns).
2.6.8 JTAG Signals
Table 38 lists the JTAG timing specifications shown in Figure 29 through Figure 32.
Table 38. JTAG Timing
Characteristics
Symbol
TCK cycle time
t_TCKX
TCK clock high phase measured at V_M = V_DDIO/2
t_TCKH
Boundary scan input data setup time
t_BSVKH
Boundary scan input data hold time
t_BSXKH
TCK fall to output data valid
t_TCKHOV
TCK fall to output high impedance
t_TCKHOZ
TMS, TDI data setup time
t_TDIVKH
TMS, TDI data hold time
t_TDIXKH
TCK fall to TDO data valid
t_TDOHOV
TCK fall to TDO high impedance
t_TDOHOZ
TRST assert time
t_TRST
Note: All timings apply to OnCE module data transfers as well as any other transfers via the JTAG port.
All frequencies
Min
Max
36.0
—
15.0
—
0.0
—
15.0
—
—
20.0
—
24.0
0.0
—
5.0
—
—
10.0
—
12.0
100.0
—
Unit
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
Figure 29 shows the test clock input timing diagram
TCK
(Input)
t_TCKX
V_M
t_TCKH
V_M
t_TCKR
t_TCKR
Figure 29. Test Clock Input Timing
MSC8154 Quad-Core Digital Signal Processor Data Sheet, Rev. 6
52
Freescale Semiconductor