DE4 User Manual
20
www.terasic.com
June 20, 2018
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JTAG Control DIP Switch
The JTAG control DIP switch is provided to either remove or include devices in the active JTAG
chain. The JTAG signals (TDI and TDO) found on the HSMC connectors and PCIe interface can be
enabled using a 3-position DIP switch. In the “OFF” position, the TDI and TDO signals are looped,
similarly in the “ON” position, the JTAG signals are bypassed.
Table 2–1
lists the position of the
DIP switch and their associated interface.
Table 2–1 SW8 JTAG Control DIP Switch
Board Reference
Signal Name
Description
Default
SW8.1
JTAG_HSMA_EN
On : Bypass HSMA
Off: HSMA In-chain
On
SW8.2
JTAG_HSMB_EN
On: Bypass HSMB
Off: HSMB In-chain
On
SW8.3
JTAG_PCIE_EN
On: Bypass PCI Express
Off : PCI Express In-Chain
On
PCI Express Control DIP switch
The PCI Express Control DIP switch is provided to enable or disable different configurations of the
PCIe Connector.
Table 2–2
lists the switch controls and description.
Table 2–2 SW9 PCIe Control DIP Switch
Board Reference Signal Name
Description
Default
SW9.1
PCIE_PRSNT2n_x1
On : Enable x1 presence detect
Off: Disable x1 presence detect
Off
SW9.2
PCIE_PRSNT2n_x4
On : Enable x4 presence detect
Off: Disable x4 presence detect
Off
SW9.3
PCIE_PRSNT2n_x8
On : Enable x8 presence detect
Off: Disable x8 presence detect
On
Содержание ALTERA DE4
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