MMC2107 - Freescale Semiconductor

Freescale Semiconductor, Inc.
JTAG Test Access Port and OnCE
Functional Description
The interface to the OnCE controller and its resources are based on the
TAP defined for JTAG in the IEEE 1149.1 standard.
21.14.1 Operation
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Freescale Semiconductor, I
An instruction is scanned into the OnCE module through the serial
interface and then decoded. Data may then be scanned in and used to
update a register or resource on a write to the resource, or data
associated with a resource may be scanned out for a read of the
resource.
1
0
TEST-LOGIC-RESET
0
RUN-TEST/IDLE
1 SELECT DR-
1
SCAN
1
0
0
CAPTURE — DR
SHIFT — DR
1
EXIT1 — DR
PAUSE — DR
1
EXIT2 — DR
SELECT — IR
SCAN
CAPTURE — IR
0 0
0
1
1
SHIFT — IR
0
1
0
1
1
EXIT1 — IR
0
0
0
0
PAUSE — IR
1
EXIT2 — IR
1
0
1
UPDATE — DR
UPDATE — IR
1
0
1
0
Figure 21-6. OnCE Controller
MMC2107 – Rev. 2.0
Technical Data
MOTOROLA JTAG Test Access Port and OnCE 557
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