NXP Semiconductors MPC5644A, Reference Manual, Page: 1672 / 1735

Nexus Port Controller (NPC)
MPC5644A Microcontroller Reference Manual, Rev. 6
1672 Freescale Semiconductor
— The Nexus block reset is controlled with JCOMP, power-on reset, and the TAP state machine.
All theses sources are independent of system reset
— Power-on-reset status indication during reset via MDO[0] in disabled and reset modes
• As some of the pads used for the Nexus interface are multi-voltage pads, the maximum supported
interface frequency is limited to 40 MHz in some modes. This corresponds to a MCKO clock
divider of 1/2 for system clocks up to 80 MHz, and 1/4 for system clocks > 80 MHz.
• Nexus Double Data Rate (DDR) mode is not available in the MPC5644A family of devices.
• A control bit in the Nexus port controller, NP_PCR[NEXCFG], is used to control whether the
added signals for full width trace port are routed to the MDO[4:11] signals, or the
CAL_MDO[4:11] signals. Although the CAL_MDO[4:11] signals are only available in the 496
CSP package, this control bit still needs to be programmed when the device is assembled in any
other package.
Table 37-1 shows the maximum trace port frequencies supported in different configurations, as
well as the operation of the NPC_PCR[FPM] and [NEXCFG] control bits.
37.1.2 Parameter values
Table 37-1. Nexus trace port routing and speed
Package
Max.
trace
port
MHz
Port width
NPC_PCR[FPM]
Port routing bit
NPC_PCR[NEXCFG]
MDO[0:3]
usage
MDO[4:11]
usage
CAL_MDO[4:11]
usage
Production
(176QFP,
208BGA,
324BGA)
80 4 MDO
(Narrow, FPM=0) Don’t care Trace port
use I/O use Inactive
40 12 MDO
(Wide, FPM=1) NEXCFG = 1 Trace port
use
Debug/Cal
package
(496 CSP)
80 4 MDO
(Narrow, FPM=0) Don't care I/O use
40 12 MDO
(Wide, FPM=1) NEXCFG = 1
Use MDO Trace port
use Trace port use
80 NEXCFG = 0
(Default setting)
Use CAL_MDO I/O use Trace port use
Table 37-2. Parameter values
Parameter Description Value
NPC parameters
RPM_MDO (R) Number of MDO pins available in reduced-port mode 4
NUM_AUX (X) Number of Nexus devices on the device sharing the
Nexus auxiliary port (not including the NPC) 1
NUM_BKPT (B) Number of breakpoint requests coming into the block
from Nexus and non-Nexus sources on the device 1