PPC405EP – PowerPC 405EP Embedded Processor Revision 1.08 – March 24, 2008
AMCC 31
Data Sheet
Table 6. Signal Functional Description (Sheet 1 of 6)
Secondary multiplexed signals are shown in brackets.
Notes:
1. Receiver input has hysteresis.
2. Must pull up. See “Pull-Up and Pull-Down Resistors” on page 29 for recommended termination values.
3. Must pull down. See “Pull-Up and Pull-Down Resi stors” on page 29 for recommended termination values.
4. If not used, must pull up.
5. If not used, must pull down.
6. Strapping input during reset; pull up or pull down as required.
7. Pull-up may be required. See “External Bus Control Signals” on page 30.
Signal Name Description I/O Type Notes
PCI Interface
PCIAD00:31
PCI Address/Data Bus. Multiplexed address and data bus.
Note: The target device number is driven on PCIAD11:31 for PCI
Type 0 configuration transactions.
Connect the target IDSEL associated with device:
1 to PCIAD16
2 to PCIAD17
...
21 to PCIAD31.
I/O 5V tolerant
3.3V PCI
PCIC3:0/BE3:0 PCI bus command and byte enables. I/O 5V tolerant
3.3V PCI
PCIClk PCIClk is used as the asynchronous PCI clock when in asynch mode. I 5V tolerant
3.3V PCI
PCIFrame PCIFrame is driven by the current PCI bus master to indicate the
beginning and duration of a PCI access. I/O 5V tolerant
3.3V PCI 2
PCIParity PCI parity. Parity is even across PCIAD00:31 and PCIC3:0/BE3:0.
PCIParity is valid one cycle after either an address or data phase.
The PCI device that drove PCIAD00:31 is responsible for driving
PCIParity on the next PCI bus clock. I/O 5V tolerant
3.3V PCI
PCIIRDY PCIIRDY is driven by the current PCI bus master. Assertion of
PCIIRDY indicates that the PCI initiator is ready to transfer data. I/O 5V tolerant
3.3V PCI 2
PCITRDY The target of the current PCI transaction drives PCITRDY. Assertion
of PCITRDY indicates that the PCI target is ready to transfer data. I/O 5V tolerant
3.3V PCI 2
PCIStop The target of the current PCI transaction can assert PCIStop to
indicate to the requesting PCI master that it wants to end the current
transaction. I/O 5V tolerant
3.3V PCI 2
PCIDevSel PCIDevSel is driven by the target of the current PCI transaction. A
PCI target asserts PCIDevSel when it has decoded an address and
command encoding and claims the transaction. I/O 5V tolerant
3.3V PCI 2
PCIIDSel PCIIDSel is used during configuration cycles to select the PCI slave
interface for configuration. I5V tolerant
3.3V PCI
PCIINT
PCI interrupt. Open-drain output (two states; 0 or open circuit)
or
Peripheral write enable. Low when any of the four PerWBE0:3 write
byte enables are low.
O5V tolerant
3.3V PCI
PCISErr PCISErr is used for reporting address parity errors or catastrophic
failures detected by a PCI target. I/O 5V tolerant
3.3V PCI 2
PCIPErr PCIPErr is used for reporting data parity errors on PCI transactions.
PCIPErr is driven active by the device receiving PCIAD00:31,
PCIC3:0/BE3:0, and PCIParity, two PCI clocks following the data in
which bad parity is detected. I/O 5V tolerant
3.3V PCI 2
PCIReset PCI specific reset. O 5V tolerant
3.3V PCI
PCIReq0/Gnt Multipurpose signal, used as PCIReq0 when internal arbiter is used,
and as Gnt when external arbiter is used. I5V tolerant
3.3V PCI