PI7C9X7952AFDE Pericom Semiconductor, PI7C9X7952AFDE Datasheet - Page 21

• Manufacturer Part Number: PI7C9X7952AFDE
• Description: IC PCIE-TO-UART BRIDGE 128LQFP
• Manufacturer: Pericom Semiconductor

Specifications of PI7C9X7952AFDE

• Applications: PCIe-to-Uart Bridge
• Interface: Advanced Configuration Power Interface (ACPI)
• Voltage - Supply: 1.8V, 3.3V
• Package / Case: 128-LQFP
• Mounting Type: Surface Mount
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

5.2.10. Internal Loopback
The internal loopback capability of the UARTs is enabled by setting Modem Control Register bit-4
(MCR[4]) to 1. When the feature is enabled, the data from the output of the transmit shift register are
looped back to the input of the receive shift register. This feature provides the users a way to perform
system diagnostics by allowing the UART to receive the same data it is sending.
September 2009 – Revision 1.3
Pericom Semiconductor
Figure 5-2 Internal Loopback in PI7C9X7952
09-0087
Page 21 of 68
Transmit Shift
Receive Shift
Register
Register
RTS#
CTS#
DTR#
DSR#
MCR bit-4=1
VCC
VCC
VCC
DTR#[1:0]
DSR#[1:0]
RTS#[1:0]
CTS#[1:0]
TX[1:0]
RX[1:0]
PCI Express® Dual UART
PI7C9X7952
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