Nexus Development Interface (NDI)
PXN20 Microcontroller Reference Manual, Rev. 1
36-104 Freescale Semiconductor
The TAP controller operates at both 3.3 V and 5 V, according to the device power supply, but the Nexus
output port operates only at 3.3 V maximum and is provided only on the 256MAPBGA emulation
package.
Based on the following assumptions:
• Average message length: 20 bits
• 1 jump every 10 instructions
• MCKO capable of supporting 1/2 the system clock frequency (64 MHz maximum)
• MDO pins operate at half of the system clock speed
It is required to have 12 dedicated medium MDO pins. The N3/N2+ auxiliary port is bonded out only in
the 256-pin MAPBGA package.
Boundary scan test is supported.
36.10 Debug Port
The debug port is composed of a total number of 22 pads as described in the following Table 36-69. The
five JTAG pads are available on every device of the family and are not multiplexed.
The EVTO and EVTI functions are bonded out on dedicated 3.3 V pads on the 256MAPBGA. They are
provided on the 208MAPBGA on 5 V pads multiplexed with GPIO. The remaining NDI pins are available
as dedicated 3.3 V pads only on the 256MAPBGA package.
Table 36-69. Pin/Pad Multiplexing
Pin Debug Port Multiplexed?
Available on
208 MPABGA
Available on
256 MAPBGA
TDI JTAG Dedicated Dedicated Dedicated
TDO JTAG Dedicated Dedicated Dedicated
TMS/ JTAG Dedicated Dedicated Dedicated
TCK JTAG Dedicated Dedicated Dedicated
JCOMP JTAG Dedicated Dedicated Dedicated
MCKO N2+/3 Aux port Dedicated NO Dedicated
MDO[0] N2+/3 Aux port Dedicated NO Dedicated
MDO[1] N2+/3 Aux port Dedicated NO Dedicated
MDO[2] N2+/3 Aux port Dedicated NO Dedicated
MDO[3] N2+/3 Aux port Dedicated NO Dedicated
MDO[4] N2+/3 Aux port Dedicated NO Dedicated
MDO[5] N2+/3 Aux port Dedicated NO Dedicated
MDO[6] N2+/3 Aux port Dedicated NO Dedicated
MDO[7] N2+/3 Aux port Dedicated NO Dedicated
MDO[8] N2+/3 Aux port Dedicated NO Dedicated
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