參數(shù)資料
型號(hào)： MPC8540CVT667JC
廠商： Freescale Semiconductor
文件頁(yè)數(shù)： 46/104頁(yè)
文件大?。?/td> 0K
描述： MPU POWERQUICC III 783FCPBGA
標(biāo)準(zhǔn)包裝： 36
系列： MPC85xx
處理器類(lèi)型： 32-位 MPC85xx PowerQUICC III
速度： 667MHz
電壓： 1.2V
安裝類(lèi)型： 表面貼裝
封裝/外殼： 784-BBGA，F(xiàn)CBGA
供應(yīng)商設(shè)備封裝： 783-FCPBGA（29x29）
包裝： 托盤(pán)
MPC8540 Integrated Processor Hardware Specifications, Rev. 4.1
46
Freescale Semiconductor
JTAG
10 JTAG
This section describes the AC electrical specifications for the IEEE 1149.1 (JTAG) interface of the
MPC8540.
Table 38 provides the JTAG AC timing specifications as defined in Figure 26 through Figure 29.
Table 38. JTAG AC Timing Specifications (Independent of SYSCLK) 1
At recommended operating conditions (see Table 2).
Parameter
Symbol 2
Min
Max
Unit
Notes
JTAG external clock frequency of operation
fJTG
033.3
MHz
JTAG external clock cycle time
t JTG
30
—
ns
JTAG external clock pulse width measured at 1.4 V
tJTKHKL
15
—
ns
JTAG external clock rise and fall times
tJTGR & tJTGF
02
ns
6
TRST assert time
tTRST
25
—
ns
3
Input setup times:
Boundary-scan data
TMS, TDI
tJTDVKH
tJTIVKH
4
0
—
ns
4
Input hold times:
Boundary-scan data
TMS, TDI
tJTDXKH
tJTIXKH
20
25
—
ns
4
Valid times:
Boundary-scan data
TDO
tJTKLDV
tJTKLOV
4
20
25
ns
5
Output hold times:
Boundary-scan data
TDO
tJTKLDX
tJTKLOX
ns
5
JTAG external clock to output high impedance:
Boundary-scan data
TDO
tJTKLDZ
tJTKLOZ
3
19
9
ns
5, 6
Notes:
1.All outputs are measured from the midpoint voltage of the falling/rising edge of tTCLK to the midpoint of the signal in
question. The output timings are measured at the pins. All output timings assume a purely resistive 50-
Ω load
(see Figure 25). Time-of-flight delays must be added for trace lengths, vias, and connectors in the system.
2.The symbols used for timing specifications herein follow the pattern of t(first two letters of functional block)(signal)(state)
(reference)(state) for inputs and t(first two letters of functional block)(reference)(state)(signal)(state) for outputs. For example,
tJTDVKH symbolizes JTAG device timing (JT) with respect to the time data input signals (D) reaching the valid state
(V) relative to the tJTG clock reference (K) going to the high (H) state or setup time. Also, tJTDXKH symbolizes JTAG
timing (JT) with respect to the time data input signals (D) went invalid (X) relative to the tJTG clock reference (K)
going to the high (H) state. Note that, in general, the clock reference symbol representation is based on three
letters representing the clock of a particular functional. For rise and fall times, the latter convention is used with
the appropriate letter: R (rise) or F (fall).
3.TRST is an asynchronous level sensitive signal. The setup time is for test purposes only.
4.Non-JTAG signal input timing with respect to tTCLK.
5.Non-JTAG signal output timing with respect to tTCLK.
6.Guaranteed by design.
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