
Silicon Image, Inc. 
Pin Number: 113 
PCI_PAR is even parity across PCI_AD[31:0] and PCI_CBE[3:0]_N. Parity generation is required by all PCI agents.  PCI_PAR 
is stable and valid one clock after the address phase.  For data phases PCI_PAR is stable and valid one clock after either 
PCI_IRDY_N is asserted on a write transaction or PCI_TRDY_N is asserted on a read transaction.  Once PCI_PAR is valid, it 
remains valid until one clock after the completion of the current data phase.  (PCI_PAR has the same timing as PCI_AD[31:0] 
but delayed by one clock.) 
PCI Request 
SiI0680A PCI to IDE/ATA  
Data Sheet
 2006 Silicon Image, Inc. 
SiI-DS-0069-C
29 
Pin Name: PCI_REQ_N 
Pin Number: 136 
This signal indicates to the arbiter that this agent desires use of the PCI bus.  
PCI Grant 
Pin Name: PCI_GNT_N 
Pin Number: 137 
This signal indicates to the agent that access to the PCI bus has been granted.  In response to a PCI request, this is a point-to-
point signal.  Every master has its own PCI_GNT_N, which must be ignored while PCI_RST_N is asserted.   
PCI Interrupt A 
Pin Name: PCI_INTA_N 
Pin Number: 138 
Interrupt A is used to request an interrupt on the PCI bus.  PCI_INTA_N is open collector and is an open drain output.   
PCI Clock Signal 
Pin Names: PCI_CLK 
Pin Number: 140 
Clock Signal provides timing for all transactions on PCI and is an input to every PCI device.  All other PCI signals (except 
PCI_RST_N, and PCI_INTA_N) are sampled on the rising edge of PCI_CLK.  All other timing parameters are defined with 
respect to this edge.   
PCI Reset 
Pin Name: PCI_RST_N 
Pin Number: 141 
PCI_RST_N is an active low input that is used to set the internal registers to their initial state.  PCI_RST_N is typically the 
system power-on reset signal as distributed on the PCI bus. 
3.3.4  Miscellaneous I/O  
Ground 
Pin Name: VSS  
Pin Number: 1, 17, 27, 37, 52, 62, 73, 88, 99, 109, 119, 129 
Ground reference point to power supply.   
PLL VDD 
Pin Name: PLL_VDD 
Pin Number: 2 
Dedicated PLL Power supply (3.3 Volts +/- 10%). Refer to section 7.1 for PLL connections. 
PLL Charge Pump Bias 
Pin Name: PLL_CPBIAS 
Pin Number: 3 
Dedicated PLL analog pin for charge pump bias.  Refer to section 7.1 for PLL connections.