Address
Translator,
OCP
Master/Slave
OCP Side
(Configuration
Data and
DMA Interface)
Interrupts
Clock/Reset
Power
Constrol
PCIe
Core
PCIe PHY
pcie_txp0
pcie_txn0
pcie_rxp0
pcie_rxn0
PIPE
pcie_txp1
pcie_txn1
pcie_rxp1
pcie_rxn1
pcie_refp_clk
pcie_refn_clk
PCIe
Supply, Ground,
and Termination
Preliminary
Introduction
www.ti.com
Figure 13-1. PCIe Subsystem (PCIESS) Block Diagram
13.1.4.4 Clock, Reset, Power Control Logic
Several clock domains exist within PCIESS. These clocks are functional clocks used by the PCIe
controller and interface bridges as well as receive and transmit clocks used to clock data in and out
respectively. The clocks required for clocking data and PHY functional clocks are generated by the PHY
through the supplied external input 100 MHz differential clock with no more than 300ppm tolerance. The
PCIe controller functional clock frequency is generated from the internal PLL and should be
programmed to generate a clock frequency of 250MHz.
The PCIESS supports the Conventional Reset mechanism that is specified within the PCI Express
Specification. The reset shown on the block diagram pertains to a hardware reset (cold or warm reset).
In addition to automatic power down mode exercised and entered by the hardware (Active State Power
Management) when no activity is present, PCIESS supports higher level power down modes controlled
(activated and deactivated) by application software.
NOTE:
Link state L2 is not supported.
13.1.4.5 Interrupts
The PCIESS is capable of generating multiple interrupts events via the four interrupt lines
(INTA/B/C/D – Legacy Interrupts Combined, MSI, Error, and PM/Reset), connected to the Interrupt
Controller. The user software is required to acknowledge the serviced interrupt by writing to the
corresponding vector onto the EOI register.
1274
Peripheral Component Interconnect Express (PCIe)
SPRUGX9 – 15 April 2011
© 2011, Texas Instruments Incorporated
Содержание TMS320C6A816 Series
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