參數(shù)資料
型號(hào)： PC7410
廠商： Atmel Corp.
英文描述： PowerPC 7410 RISC Microprocessor Product Specification
中文描述： 7410的PowerPC RISC微處理器產(chǎn)品規(guī)格
文件頁(yè)數(shù)： 47/54頁(yè)
文件大?。?/td> 692K
代理商： PC7410
47
PC7410
2141D–HIREL–02/04
Boundary scan testing is enabled through the JTAG interface signals. (BSDL descrip-
tions
of
the
PC7410
are
available
www.mot.com/PowerPC/teksupport.) The TRST signal is optional in the IEEE 1149.1
specification but is provided on all PowerPC implementations. 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 dur-
ing power-on reset. Since the JTAG interface is also used for accessing the common
on-chip processor (COP) function of PowerPC processors, simply tying TRST to
HRESET is not practical.
on
the
Internet
at
The common on-chip processor (COP) function of PowerPC 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 interface con-
nects primarily through the JTAG port 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 32 allows the COP to independently assert HRESET
or TRST, while ensuring that the target can drive HRESET as well. The pull-down resis-
tor on TRST ensures that the JTAG scan chain is initialized during power-on if a JTAG
interface cable is not attached; if it is attached, it is responsible for driving TRST when
needed.
Table 20.
COP Pin Definitions
Pins
Signal
Connection
Special Notes
1
TDO
TDO
2
QACK
QACK
Add 2K pull-down to ground. Must be merged with on-board QACK, if any.
3
TDI
TDI
4
TRST
TRST
Add 2K pull-down to ground. Must be merged with on-board TRST if any.
See Figure 32.
5
RUN/STOP
No Connect
Used on 604e; leave no-connect for all other processors.
6
VDD_SENSE
VDD
Add 2K pull-up to OV
DD
(for short circuit limiting protection only).
7
TCK
TCK
8
CKSTP_IN
CKSTP_IN
Optional. Add 10K pull-up to OV
DD
. Used on several emulator products. Useful for
checkstopping the processor from a logic analyzer of other external trigger.
9
TMS
TMS
10
N/A
11
SRESET
SRESET
Merge with on-board SRESET, if any.
12
N/A
13
HRESET
HRESET
Merge with on-board HRESET.
14
N/A
Key location; pin should be removed.
15
CKSTP_OUT
CKSTP_OUT
Add 10K pull-up to OV
DD
.
16
Ground
Digital Ground
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