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System Implementation
1-15
PCI445X Device
If the third ZV source is not implemented, ZVPCLK and ZVSTAT are not
required. To support ZV audio, an audio codec device is required for L and R
sound decoding.
1.3.3 Interrupt Signaling Interface
- Serialized Interrupt Interface
The serialized interrupt (ISA and PCI) interface is a single-line interface,
IRQSER. A pullup resistor is required on this terminal. The signal is
synchronous to PCLK, so PCLK is a required signal. Please remember
that SUSPEND gates PCLK internally. Usually this signal is connected to
the south bridge (ex., PIIX4). The IRQSER signal is sharable with other
devices.
- Parallel PCI Interrupt
See Section 1.2.2, PCI Bus Interface.
1.3.4 Miscellaneous Signals
1.3.4.1 SUSPEND
The SUSPEND signal gates the PRST and G_RST signals from the PCI445X
device. SUSPEND also gates PCLK inside the PCI445X device in order to
minimize power consumption. Gating PCLK makes the IRQSER state
machine stop until SUSPEND is deasserted. Two requirements for
implementing suspend mode are that the PCI bus must not be parked on the
PCI445X device and IRQSER signaling is not proceeding when SUSPEND
is
asserted.
1.3.4.2 RI_OUT and PME
RI_OUT can be programmed on the RI_OUT/PME or MFUNC7 terminal. PME
can be programmed only on the RI_OUT/PME terminal. To support both
RI_OUT and PME in a system, the RI_OUT/PME terminal must be
programmed as PME
. These signals are usually connected to the south bridge
(ex., PIIX4) or an embedded controller (EC). Buffers of the RI_OUT/PME type
are open-drain; therefore, a pullup resistor is required on this terminal.
1.3.4.3 SPKROUT
SPKROUT is a dedicated terminal and it is usually mixed to PC sound, and
connected to a sound device.
1.3.4.4 Activity LEDs
Activity LEDs can be programmed on MFUNC terminals. These signals are
active-high and driven for 64 ms duration.
1.3.4.5 Distributed DMA (DDMA)
The PCI445X device supports both PC/PCI (centralized) DMA and a
distributed DMA slave engine for 16-bit PC Card DMA support.