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| 型号： | 1215E |
| 英文描述： | TEST/JTAG SUPPORT|CMOS|QFP|48PIN|PLASTIC |
| 中文描述： | 测试/ JTAG支持|的CMOS | QFP封装| 48PIN |塑料 |
| 文件页数： | 47/92页 |
| 文件大小： | 1041K |
| 代理商： | 1215E |
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Agere Systems Inc.
51
User Manual
April 2001
Advanced Operational Mode
497AE and 1215E Boundary-Scan Master 2
Appendix B—BSM2 Register Descriptions (continued)
CBIST: Control-BIST Register (continued)
XECBIST
(Execute BIST Bit)—When a 1 is written to this bit, execution of BIST will occur. When the value of
the bit is 0, execution is not initiated. This bit may be written simultaneously with or after the writing
of the bits that establish the BIST control parameters—MEMSKIP, RLSKIP, MEMRETE, and
BIST_IE.
Execution of BIST may be shut off at any time by writing a 0 to the XECBIST bit. After normal BIST
termination, the XECBIST bit also should be set to 0. Writing a 0 to the XECBIST bit not only termi-
nates a BIST operation, but also clears the DONE bits and initializes miscellaneous internal BIST
control registers.
A reset (through hardware or software) should be applied after BIST operations to initialize all reg-
isters. Operation of memory BIST will naturally destroy any information in the TVI and TVO memo-
ries.
BIST_IE
(BIST Interrupt Enable Bit)—When the value of this bit is 1 and execution of BIST is initiated, the
BSM2 will generate an interrupt via the interrupt pin (INT*) when the selected BIST operation(s) is/
are done (see SYSDONE, below).
SYSDONE
(All BIST Done Bit)—When the value of this bit is 1, all BIST operations are complete. BIST result
signatures can be read. When the value of this bit is 0, BIST is running (not finished) or the CBIST
register has been cleared to its default value. Since the SYSDONE bit is read-only, the only means
of clearing it is setting the XECBIST bit to 0.
MEMDONE
(Memory BIST Done Bit)—When the value of this bit is 1, memory BIST execution is complete.
The signature produced by memory BIST can be read in MEMSIG[5:0] (below). The passing sig-
nature consists of all zeros. When the value of the MEMDONE bit is 0, then memory BIST is run-
ning (not finished) or the CBIST register has been cleared to its default value. Since the
MEMDONE bit is read-only, the only means of clearing it is setting the XECBIST bit to 0.
RL_DONE
(Random Logic BIST Done Bit)—When the value of this bit is 1, random logic BIST execution is
complete. The signature produced by random logic BIST can be read in the BIST signature regis-
ter (BSR) register. The passing signature (hex) is 000BDB3A. When the value of the RL_DONE bit
is 0, then random logic BIST is running (not finished) or the CBIST register has been cleared to its
default value. Since the RL_DONE bit is read-only, the only means of clearing it is setting the
XECBIST bit to 0.
MEMSIG[5:0]
(Memory BIST Signature Bits)—At the completion of memory BIST (see MEMDONE, above), a
BSM2 that has passed memory BIST will contain 00000 (binary) in the MEMSIG bits. All other val-
ues indicate failure of memory BIST. Since the MEMSIG bits are read-only, they are only cleared if
memory BIST completes without detecting a fault. Otherwise, the values of these bits are unde-
fined.
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