UM0434 datasheet(366/390 Pages) STMICROELECTRONICS

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UM0434

Nexus3 module

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Error information is messaged out in the format, shown in

Table 266:

12.9.4

Watchpoint timing diagram (2 MDO/1 MSEO Configuration)

Figure 81.

Watchpoint message and watchpoint error message

12.10

Nexus3 Read/Write access to Memory-Mapped resources

The read/write access feature allows access to memory-mapped resources through the

JTAG/OnCE port. The read/write mechanism supports single as well as block reads and

writes to e200z3 AHB resources.

The Nexus3 module is capable of accessing resources on the e200z3 system bus, AHB,

with multiple configurable priority levels. Memory-mapped registers and other non-cached

memory can be accessed through the standard memory map settings.

All accesses are set up and initiated by the read/write access control/status register, RWCS,

as well as RWA and RWD.

Using RWCS, RWA and RWD, memory-mapped e200z3 AHB resources can be accessed

through Nexus3. The following sections describe the steps that are required to access

memory-mapped resources.

Note:

Read/write access can only access memory-mapped resources when system reset is de-

asserted and clocks are running. Misaligned accesses are not supported in the e200z3

Nexus3 module.

12.10.1

Single write access

Note:

In the first three steps, the registers are initialized using the access method outlined in

Chapter 12.5: Nexus3 register access through JTAG/OnCE on page 348.”

Table 266.

Error message format

(5 bits)

(4 bits)

(6 bits)

Error Code (00110/01000

Source Process

TCODE (001000)

Fixed length = 15 bits

Watchpoint

Error

WPM:

TCODE = 15

Source processor = 00

Watchpoint number = 2

Error:

TCODE = 8

Source processor = 00

Error code = 6 (Queue overrun—WPM only)

p_mcko

p_mseo_b

p_mdo[1:0]

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