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| 型號： | 1215E |
| 英文描述： | TEST/JTAG SUPPORT|CMOS|QFP|48PIN|PLASTIC |
| 中文描述： | 測試/ JTAG支持|的CMOS | QFP封裝| 48PIN |塑料 |
| 文件頁數： | 4/92頁 |
| 文件大小： | 1041K |
| 代理商： | 1215E |
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12
Agere Systems Inc.
User Manual
April 2001
Advanced Operational Mode
497AE and 1215E Boundary-Scan Master 2
The BSM2 Scan Process (continued)
Writing, Reading, and Operation of the Input
and Output Scan Data FIFOs (TVI and TVO)
(continued)
Prior to execution, the user may program a pause dur-
ing a subsequent normal scan operation by gating the
signal on TCK. This is done by use of the GCLK bit in
the CSC register. The gated clock function is described
under the heading TCK Gating.
Overwriting TVO and Overreading TVI
If the user writes to the TVO memory when it is full,
data in the FIFO will be overwritten. If the user reads
the TVI memory when it is empty, the value will be
unpredictable and useless. In both cases the memory
pointers will become incorrect; and, consequently, the
FIFOs will be corrupted. The only way to recover is to
reinitialize and restart the interrupted operation. The
FIFOs are reinitialized by setting the values of both the
zero.
Avoiding Overwriting TVO and Overreading TVI
Overwriting TVO (overreading TVI) can be avoided by
checking if TVO has been filled (or TVI emptied).
When TVO is full, the TVOU bit in the status register
will have the value 1. When TVI is empty, the TVIM bit
in the status register will have the value 1.
Overflow and Underflow Conditions
Overflow is the condition in which more data is
scanned out of the selected/attached B-S chain than
can be stored in the TVI test data memory.
Underflow is the condition in which insufficient data is
loaded in the TVO test data memory for the current
scan operation. Underflow is not projected when the
TVO memory is loaded. The condition is discovered by
the BSM2 when it arises during the subsequent scan
operation.
When overflow or underflow of a test data memory
(FIFO) occurs, the BSM2 can be programmed to
always enter the appropriate Pause-
xR TAP Controller
state or to gate the test clock (halt the signal on TCK).
The programming is done by the loading the appropri-
ate value in the GCLK bit of the CSC register prior to
/overflow results in halting the test clock. When GCLK
= 0, under-/overflow causes transfer of the TAP control-
lers in the selected/attached B-S chain to enter the
nearest Pause-xR TAP Controller state.
Jump and Reset Commands
By use of the EXEC[1:0] bits of the CUTI register, the
controlling processor can direct the BSM2 to drive the
TAP State Tracker to specific TAP Controller states.
WARNING: The Jump and Reset commands exe-
cute whether or not there is any other
ongoing process executing in the
BSM2.
Jump Command
The jump command is designed to be used when a
BSM2 is controlling more than one B-S chain and
needs to the synchronize to the current state of the
TAP Controllers in a newly selected B-S chain after
having carried a sequence of operations on another.
This command is not locked out by a concurrently exe-
cuting process.
The jump command results in the direct movement of
the TAP State Tracker from the current TAP Controller
state to any other one selected by programming. The
move between states is not restricted to following an
arc of the TAP Controller’s finite state machine. More-
over, with the exception of a jump to/from the Test-
Logic-Reset TAP Controller state, the TMS output sig-
nal is not effected; and the TAP Controllers of the for-
merly selected/attached B-S chain will only change
state as directed by subsequent programming of the
BSM2. When the jump is to/from the Test-Logic-Reset
TAP Controller state, the signal on TMS must change
from 0 to 1 or vice versa.
WARNING: Issuing the Jump Command while exe-
cuting a scan operation, can produce
undesirable results, although the
results are predictable if the cycle of
the TCK signal is long enough so that
the controlling processor can monitor
operations.
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