Datasheet

2−12
Table 2−7. PCI System Terminals
TERMINAL
NAME
NO.
I/O DESCRIPTION
NAME
PDV GHK
I/O
DESCRIPTION
GRST 177 C11 I
Global reset. When the global reset is asserted, the GRST signal causes the PCI1520 to place all output
buffers in a high-impedance state and reset all internal registers. When GRST
is asserted, the device is
completely in its default state. For systems that require wake-up from D3, GRST
normally is asserted only
during initial boot. PRST
should be asserted following initial boot so that PME context is retained during the
transition from D3 to D0. For systems that do not require wake-up from D3, GRST
should be tied to PRST.
When the SUSPEND
mode is enabled, the device is protected from GRST, and the internal registers are
preserved. All outputs are placed in a high-impedance state.
PCLK 182 C10 I
PCI bus clock. PCLK provides timing for all transactions on the PCI bus. All PCI signals are sampled at the
rising edge of PCLK.
PRST
168 C13 I
PCI reset. When the PCI bus reset is asserted, PRST causes the PCI1520 to place all output buffers in a
high-impedance state and reset internal registers. When PRST
is asserted, the device can generate the PME
signal only if it is enabled. After PRST is deasserted, the PCI1520 is in a default state.
When the SUSPEND
mode is enabled, the device is protected from PRST, and the internal registers are
preserved. All outputs are placed in a high-impedance state.