PPC405EP datasheet(31/50 Pages) AMCC

31 / 50 page

PPC405EP – PowerPC 405EP Embedded Processor

Revision 1.07 – September 10, 2007

AMCC

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 Resistors” 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.

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

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

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

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

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

PCIIDSel

PCIIDSel is used during configuration cycles to select the PCI slave

interface for configuration.

5V tolerant

3.3V PCI

PCIINT

PCI interrupt. Open-drain output (two states; 0 or open circuit)

Peripheral write enable. Low when any of the four PerWBE0:3 write

byte enables are low.

5V 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

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

PCIReset

PCI specific reset.

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.

5V tolerant

3.3V PCI

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