参数资料
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: 25/92页
文件大小: 1041K
代理商: 1215E
Agere Systems Inc.
31
User Manual
April 2001
Advanced Operational Mode
497AE and 1215E Boundary-Scan Master 2
Appendix A—BSM2 Pseudocode Examples (continued)
Switching Between B-S Chains
Depending on the architecture, a single BSM2 device could control several B-S chains. The design would need to
allow switching between the B-S chains—enabling the TAP signals for each B-S chain as needed. The Address-
able Scan Port (ASP) protocol and interface definition (e.g., supporting
TI’s ASP devices) is one example of such
an architecture. For the purpose of this example, we assume a single BSM2 is controlling two different B-S chains,
A and B, via enabling circuitry EA and EB, respectively.
EA and EB could be enabled via the ASP protocol, which will not be shown here.
After reset, both chains A and B have TAP controllers in their Test-Logic-Reset TAP Controller state. The BSM2
internal TAP State Tracker is in its corresponding state. Both EA & EB are disabled.
First we perform an instruction register scan to chain A with a destination of Run-Test
Idle:
Enable EA
/*Enable B-S chain A*/
Write 0x0100 to CSC
/*Scan state is Scan-IR, Destination
state is Run-Test
Idle*/
Write <n> to TVX
/*Scan n bits*/
Write <data> to TVO FIFO
/*Write n bits to FIFO*/
Write 0x0820 to CUTI
/*Start scan*/
Read STAT until DONE bit = 1
Read <data> from TVI FIFO
/*Read n bits from FIFO*/
/*Now B-S chain A is at destination
Run-Test
Idle*/
/*----------------------------------------*/
Now we send an identical instruction to chain B with a destination of Run-Test
Idle.
Disable EA
/*Disable B-S chain A*/
/*Move the BSM2 TAP State Tracker to
Test-Logic-Reset before enabling chain B*/
Write 0x0000 to CSC
/*Destination state is Test-Logic-Reset*/
Write 0x1000 to CUTI
/*Execute Jump to Destination command*/
/*This command will immediately set the
internal TAP State Tracker to
Test-Logic-Reset so that it matches the
TAP controller state of B-S chain B*/
Enable EB
/*Enable B-S chain B*/
/*----------------------------------------*/
/*Send a Shift-IR scan to chain B with a
destination of Run-Test
Idle.*/
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