Emerson COM Express Carrier, Руководство по конструкции

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Page 58 of 103 COM Express Carrier Type 2
Design Guide
11 PCI
11.1 PCI Signals Definition
The below table shows a set of pin defined to be a 32-bit PCI bus on Type 2 and 3 COM Express modules
by the COM Express specification. The PCI bus signals support up to four REQ/GNT pairs and typically
run at 33 MHz. The COM Express PCI bus is specified to be 5 V tolerant, with 3.3 V signaling. All
necessary PCI pull-ups are included on the module.
Table 14 PCI Signals Definition
Signal Pin Description I/O Comment
PCI_AD0 C24 PCI bus multiplexed
address and data lines
I/O 3.3V
PCI_AD1 D22 PCI bus multiplexed
address and data lines
I/O 3.3V
PCI_AD2 C25 PCI bus multiplexed
address and data lines
I/O 3.3V
PCI_AD3 D23 PCI bus multiplexed
address and data lines
I/O 3.3V
PCI_AD4 C26 PCI bus multiplexed
address and data lines
I/O 3.3V
PCI_AD5 D24 PCI bus multiplexed
address and data lines
I/O 3.3V
PCI_AD6 C27 PCI bus multiplexed
address and data lines
I/O 3.3V
PCI_AD7 D25 PCI bus multiplexed
address and data lines
I/O 3.3V
PCI_AD8 C28 PCI bus multiplexed
address and data lines
I/O 3.3V
PCI_AD9 D27 PCI bus multiplexed
address and data lines
I/O 3.3V
PCI_AD10 C29 PCI bus multiplexed
address and data lines
I/O 3.3V
PCI_AD11 D28 PCI bus multiplexed
address and data lines
I/O 3.3V
PCI_AD12 C30 PCI bus multiplexed I/O 3.3V