PXR40RM Datasheet, PDF (1379/1434 Pages) Freescale Semiconductor, Inc – PXR40 Microcontroller

Nexus Development Interface (NDI)
31.14.10.2 JTAG Sequence for Read Access of Memory-Mapped Resources
Table 31-34. Accessing Memory-Mapped Resources (Reads)
Step #
1
2
3
4
5
6
7
8
TCLK clocks
Description
13
Nexus Command = write to read/write access address register (RWA)
37
Write RWA (initialize starting read address—data input on TDI)
13
Nexus Command = write to read/write control/status register (RWCS)
37
Write RWCS (initialize read access mode and CNT value—data input on TDI)
—
Wait for falling edge of RDY pin
13
Nexus Command = read the read/write access data register (RWD)
37
Read RWD (data output on TDO)
—
If CNT > 0, go back to Step #5
31.14.10.3 JTAG Sequence for Write Access of Memory-Mapped Resources
Table 31-35. Accessing Memory-Mapped Resources (Writes)
Step #
1
2
3
4
5
6
7
8
TCLK clocks
Description
13
Nexus Command = write to read/write access control/status register (RWCS)
37
Write RWCS (initialize write access mode and CNT value—data input on TDI)
13
Nexus Command = write to read/write address register (RWA)
37
Write RWA (initialize starting write address—data input on TDI)
13
Nexus Command = read the read/write access data register (RWD)
37
Write RWD (data output on TDO)
—
Wait for falling edge of RDY pin
—
If CNT > 0, go back to Step #5
31.15 Nexus Crossbar eDMA Interface (NXDM) and Nexus Crossbar
FlexRay Interface (NXFR)
The third module of the device NDI interface is the e200z7 eDMA Nexus module (NXDM) which is
compliant with the Class 3 defined data trace feature of the IEEE-ISTO 5001-2011 standard.The fourth
module of the device NDI interface is the FlexRay module (NXFR) which is compliant with the Class 3
defined data trace feature of the IEEE-ISTO 5001-2011 standard. The NXDM can be programmed to trace
data accesses for the eDMA module on the system bus. The NXFR can be programmed to trace data
accesses for the FlexRay module on the system bus. This eDMA module and FlexRay module as well as
the Nexus module are components of the e200z7 platform. All output messages and register accesses are
compliant with the protocol defined in the IEEE-ISTO 5001 standard.
Freescale Semiconductor
PXR40 Microcontroller Reference Manual, Rev. 1
31-63