MMC2107 - Freescale Semiconductor

JTAG Test Access Port and OnCE
Freescale Semiconductor, Inc.
DE TCLK TMS TRST
TDI
TOP-LEVEL
TAP
LOW-LEVEL
TAP (OnCE)
MODULE MODULE
TAP
CONTROLLER
TAP
INSTRUCTION
REGISTER
MSB
3
0
LSB
BOUNDARY
SCAN
(SHIFT)
REGISTER
MSB
199
0
LSB
IDCODE
(SHIFT)
REGISTER
MSB
31
0
LSB
OnCE
TAP
CONTROLLER
OnCE CMD
INSTRUCTION
REGISTER
BYPASS
1 BIT
IR[3:0] = 0 x 3?
ENABLE_MCU_ONCE
CMD
IF YES, THEN B,
SELECT LOW-LEVEL
(OnCE) TDO;
IF NO, THAN A,
SELECT
TOP-LEVEL TDO
MUX
SELECT
MUX
SELECT
MUX
TOP-LEVEL TDO
LOW-LEVEL TDO
SELECT
A B
MUX
TDO
TDO
Figure 21-1. Top-Level Tap Module and Low-Level (OnCE) TAP Module
OnCE
DATA
REGISTERS
Freescale Semiconductor, I
nc...
Technical Data MMC2107 – Rev. 2.0
536 JTAG Test Access Port and OnCE MOTOROLA
For More Information On This Product,
Go to: www.freescale.com