UM0434 datasheet(255/390 Pages) STMICROELECTRONICS

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External core complex interfaces

UM0434

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Table 180 describes power management and other external control logic functions.

p_brstat[0:1] O

Branch prediction status. Indicates the status of a branch prediction prefetch. Such prefetches

are performed for branch target buffer (BTB) hits with predict taken status to accelerate

branches.

p_s1stat[0:1] S1 prefetch status

0x Default (no branch-predicted taken prefetch)

10 Branch-predicted taken prefetch resolved as not taken

11 Branch-predicted taken prefetch resolved as taken

Timing

Synchronous with

m_clk, so the indicated status may not apply to a current bus

transfer.

p_mcp_out

Processor machine check. Indicates whether a machine check condition has caused a

syndrome bit to be set in the machine check syndrome register (MCSR).

State

Meaning

Asserted—A machine check condition caused an MCSR bit to be set.

Negated—No machine check condition exists that would set an MCSR bit.

p_chkstop

Processor checkstop. Asserted by the processor when a checkstop condition has occurred and

the CPU has entered the checkstop state.

State

Meaning

Asserted—The processor has indicated a checkstop condition.

Negated—The processor has not indicated a checkstop condition.

As reflected on the

cpu_dbgack internal state signal

Except rfi, rfci, rfdi, lmw, stmw, lwarx, stwcx., isync, isel, se_rfi, se_rfci, se_rfdi, e_lmw, e_stmw, se_isel, and

change of flow instructions

s: instruction size, 0 = 32 bit, 1 = 16 bit.

m: 0 for Book E page, 1 for VLE page

Table 179.

Descriptions of processor state signals (continued)

Signal

I/O

Signal description

Table 180.

Descriptions of power management control signals

Signal

I/O

Signal description

p_halt

Processor halt request. Used to request that the processor enter the halted state.

State

Meaning

Asserted—Requests the processor to enter halted state.

Negated—No request is being made for the processor to enter halted state.

p_halted

Processor halted. The active-high

p_halted output signal indicates that the processor entered the

halted state.

State

Meaning

Asserted—The processor is in halted state.

Negated—The processor is not in halted state.

p_stop

Processor stop request. The active-high

p_stop input signal requests that the processor enter the

stopped state.

State

Meaning

Asserted—Requests the processor to enter stopped state.

Negated—No request is being made for the processor to enter stopped state.

p_stopped O

Processor stopped. The active-high

p_stopped output signal indicates that the processor entered

the stopped state.

State

Meaning

Asserted—The processor is in stopped state.

Negated—The processor is not in stopped state.

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