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SPEAR320 数据表(PDF) 40 Page - STMicroelectronics

部件名 SPEAR320
功能描述  Embedded MPU with ARM926 core, optimized for factory automation and consumer applications
PDF  73 Pages
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制造商  STMICROELECTRONICS [STMicroelectronics]
网页  http://www.st.com
标志 STMICROELECTRONICS - STMicroelectronics

SPEAR320 数据表(HTML) 40 Page - STMicroelectronics

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Pin description
SPEAr320
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Doc ID 16755 Rev 5
4.4
PL_GPIO pin sharing for debug modes
In some cases the PL_GPIO pins may be used in different ways for debugging purposes.
There are three different cases (see also Table 13):
1.
Case 1 - All the PL_GPIO get values from Boundary scan registers during Ex-test
instruction of JTAG . Typically this configuration is used to verify correctness of the
soldering process during the production flow .
2.
Case 2 - All the PL_GPIO maintain their original meaning but the JTAG Interface is
connected to the processor. This configuration is useful during the development phase
but offers only "static" debug.
3.
Case 3 - Some PL_GPIO, as shown inTable 13: Ball sharing during debug, are used to
connect the ETM9 lines to an external box. This configuration is typically used only
during the development phase. It offers a very powerful debug capability. When the
processor reaches a breakpoint it is possible, by analyzing the trace buffer, to
understand the reason why the processor has reached the break.
Table 13.
Ball sharing during debug
Signals
Case 1 - no debug
Case 2 - static debug
Case 3 - full debug
Test[0]
0
1
0
Test[1]
0
0
1
Test[2]
0
0/1
0/1
Test[3]
0
0/1
0/1
Test[4]
1
0/1
0/1
nTRST
nTRST_bscan
nTRST_ARM
nTRST_ARM
TCK
TCK_bscan
TCK_ARM
TCK_ARM
TMS
TSM_bscan
TMS_ARM
TSM_ARM
TDI
TDI_bscan
TDI_ARM
TDI_ARM
TDO
TDO_bscan
TDO_ARM
TDO_ARM
PL_GPIO[97]
BSR Value
Original meaning
ARM_TRACE_CLK
PL_GPIO[96]
BSR Value
Original meaning
ARM_TRACE_PKTA[0]
PL_GPIO[95]
BSR Value
Original meaning
ARM_TRACE_PKTA[1]
PL_GPIO[94]
BSR Value
Original meaning
ARM_TRACE_PKTA[2]
PL_GPIO[93]
BSR Value
Original meaning
ARM_TRACE_PKTA[3]
PL_GPIO[92]
BSR Value
Original meaning
ARM_TRACE_PKTB[0]
PL_GPIO[91]
BSR Value
Original meaning
ARM_TRACE_PKTB[1]
PL_GPIO[90]
BSR Value
Original meaning
ARM_TRACE_PKTB[2]
PL_GPIO[89]
BSR Value
Original meaning
ARM_TRACE_PKTB[3]
PL_GPIO[88]
BSR Value
Original meaning
ARM_TRACE_SYNCA
PL_GPIO[87]
BSR Value
Original meaning
ARM_TRACE_SYNCB
PL_GPIO[86]
BSR Value
Original meaning
ARM_PIPESTATA[0]
PL_GPIO[85]
BSR Value
Original meaning
ARM_PIPESTATA[1]



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