PowerPC e500 Core Family Reference Manual, Rev. 1
13-4 Freescale Semiconductor
Core Complex Bus (CCB)
tdo
O JTAG test data output. The contents of the selected internal instruction or data register are shifted out onto
this signal on the falling edge of
tck
.
tdo_ien
O Test data out enable.
tdo
provides feedback to the external TAP linking module logic.
tlmsel
O TLM selected.
tlmsel
provides feedback to the external TAP linking module logic.
tap_en
I TAP enable.
tap_en
is used by the TAP linking module (TLM) logic external to the core complex.
Clocks
pll_cfg
[0:5] I PLL configuration select. Configurations are as follows:
00000_x PLL off
00001_0 or 00001_1 PLL 1x or 1.5x
00010_0 or 00010_1 PLL 2x or 2.5x
00011_0 or 00011_1 PLL 3x or 3.5x
00100_0 or 00100_1 PLL 4x or 4.5x
... similar pattern up to 24x for even multipliers, or 12.5x for odd multipliers.
pll_clk
I PLL clock. Clock reference for the CCB.
Time Base
tbclk
I Sampled by the system logic to CCB clock. Required to be no more than 1/4 platform clock frequency. If
selected, it can be a source of the time base.
tben
I Asserted by the system logic to enable the time base
tbint
O Asserted when a time base interrupt is signaled. This ordinarily prompts external logic to bring the core out of
power-down mode by negating
stop
and then
halt
so the interrupt can be serviced.
wrs
[0:1] O Watchdog timer reset status. These two bits are set to one of three values when a reset is caused by the
watchdog timer. These bits are undefined at power-up.
00 Implementation-dependent reset information.
01 Implementation-dependent reset information.
10 Implementation-dependent reset information.
11 Idle
External Interrupts
hreset_req
O Hard reset request. When DBCRO[RST] is set, the core sends an HRESET_REQ to the system. The system
recognizes the assertion of this request and then stops the core using power management. With hreset_req
being asserted and the core being in STOPPED state,
hreset
is asserted and core flushing starts.
hreset
I Hard reset. Assertion flushes the core. When
hreset
is negated, the 256 CCB clocks core flush starts.
int
I External interrupt. Initiates an external interrupt. If
int
is asserted and MSR[EE] is set, the e500 vectors to
IVOR4.
cint
I Critical interrupt. Initiates a critical interrupt. If
cint
is asserted and MSR[CE] is set, the e500 vectors to IVOR0.
If MSR[CE] is 0, critical interrupts are disabled and the e500 does not sample
cint
.
mcp
I Machine check interrupt. Initiates a machine check operation. If MSR[ME] is set, the e500 vectors to IVOR1.
If MSR[ME] is clear, then the e500 goes into checkstop state. MCSR is updated as defined in Section 2.7.2.4,
“Machine Check Syndrome Register (MCSR).”
Table 13-1. Summary of Selected Internal Signals (continued)
Signal I/O Comments, or Meaning when Asserted
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