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| 型號： | MC8610PX1066JB |
| 廠商： | Freescale Semiconductor |
| 文件頁數(shù)： | 79/96頁 |
| 文件大?。?/td> | 0K |
| 描述： | MPU E600 CORE 1066MHZ 783-PBGA |
| 標(biāo)準(zhǔn)包裝： | 36 |
| 系列： | MPC86xx |
| 處理器類型： | 32-位 MPC86xx PowerPC |
| 速度： | 1.066GHz |
| 電壓： | 1V |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 783-BBGA，F(xiàn)CBGA |
| 供應(yīng)商設(shè)備封裝： | 783-FCPBGA（29x29） |
| 包裝： | 托盤 |
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MPC8610 Integrated Host Processor Hardware Specifications, Rev. 2
Hardware Design Considerations
Freescale Semiconductor
80
3.9
JTAG Configuration Signals
Correct operation of the JTAG interface requires configuration of a group of system control pins as demonstrated in Figure 53.
Care must be taken to ensure that these pins are maintained at a valid deasserted state under normal operating conditions as most
have asynchronous behavior and spurious assertion will give unpredictable results.
Boundary-scan testing is enabled through the JTAG interface signals. The TRST signal is optional in the IEEE 1149.1
specification, but is provided on all processors that implement the Power Architecture technology. The device requires TRST
to be asserted during reset conditions to ensure the JTAG boundary logic does not interfere with normal chip operation. While
it is possible to force the TAP controller to the reset state using only the TCK and TMS signals, more reliable power-on reset
performance will be obtained if the TRST signal is asserted during power-on reset. Because the JTAG interface is also used for
accessing the common on-chip processor (COP) function, simply tying TRST to HRESET is not practical.
The COP function of these processors allows a remote computer system (typically a PC with dedicated hardware and debugging
software) to access and control the internal operations of the processor. The COP port connects primarily through the JTAG
interface of the processor, with some additional status monitoring signals. The COP port requires the ability to independently
assert HRESET or TRST in order to fully control the processor. If the target system has independent reset sources, such as
voltage monitors, watchdog timers, power supply failures, or push-button switches, then the COP reset signals must be merged
into these signals with logic.
The arrangement shown in Figure 52 allows the COP port to independently assert HRESET or TRST, while ensuring that the
target can drive HRESET as well.
The COP interface has a standard header, shown in Figure 52, for connection to the target system, and is based on the 0.025"
square-post, 0.100" centered header assembly (often called a Berg header). The connector typically has pin 14 removed as a
connector key.
The COP header adds many benefits such as breakpoints, watchpoints, register and memory examination/modification, and
other standard debugger features. An inexpensive option can be to leave the COP header unpopulated until needed.
There is no standardized way to number the COP header shown in Figure 53; consequently, many different pin numbers have
been observed from emulator vendors. Some are numbered top-to-bottom then left-to-right, while others use left-to-right then
top-to-bottom, while still others number the pins counter clockwise from pin 1 (as with an IC). Regardless of the numbering,
the signal placement recommended in Figure 53 is common to all known emulators.
3.9.1
Termination of Unused Signals
If the JTAG interface and COP header will not be used, Freescale recommends the following connections:
TRST should be tied to HRESET through a 0-k
Ω isolation resistor so that it is asserted when the system reset signal
(HRESET) is asserted, ensuring that the JTAG scan chain is initialized during the power-on reset flow. Freescale
recommends that the COP header be designed into the system as shown in Figure 53. If this is not possible, the
isolation resistor will allow future access to TRST in case a JTAG interface may need to be wired onto the system in
future debug situations.
Tie TCK to OVDD through a 10-kΩ resistor. This will prevent TCK from changing state and reading incorrect data
into the device.
No connection is required for TDI, TMS, or TDO.
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